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1: Vinyl Asylum, RE: Instead. NT (0.00)
Posted by fastcat on 2023-11-06, 14:13:55 (75.35.202.204)
sisterray: I have a spin clean unit in new condition (I have never used it) with some extras; Willing to sell for $40 + shipping. Contact me and we can talk! Dan .......
2: Digital Drive, RE: No i2S (0.00)
Posted by fastcat on 2023-07-13, 14:12:57 (99.70.239.115)
It is possible that the advanced Unison USB connection on the URD may be better that some I2S outputs, or only very slightly less good. It is notable that there are NO standards yet on the I2S, which .......
3: Cable Asylum, Viborg VF501G and VM501G ACF Coinnector Opinions ??? (0.00)
Posted by fastcat on 2023-05-01, 12:15:47 (99.70.239.115)
Hello! Does anyone have any experience / opinions on the Viborg VM501G (male AC) and the VF501G (female IEC) power cord connectors, as far as construction and sonics in general. Are they a good lower .......
4: Tweakers' Asylum, RE: So, you have a muted output and a direct output? (0.00)
Posted by fastcat on 2023-03-15, 13:22:18 (99.70.239.115)
Mark: That has a very vintage appearance! How does your Dyna ST35 sound? I had one of those many years ago. .......
5: Tweakers' Asylum, RE: Nice! (0.00)
Posted by fastcat on 2023-03-10, 19:02:13 (99.70.239.115)
Mark: Thanks for the comments! This was a slow project that went on for years, but finally done, and well worth it. The ground wiring is 19 gauge silver plated long grain copper by Wonder (Wonder wire .......
6: Tweakers' Asylum, RE: Nice! (0.00)
Posted by fastcat on 2023-03-03, 17:41:00 (99.70.239.115)
How does your B1 sound? .......
7: Tweakers' Asylum, RE: My New DIY Passive Preamplifier (0.00)
Posted by fastcat on 2023-03-03, 17:40:10 (99.70.239.115)
The chassis can be had at the diyaudiostore.com .......
8: Tweakers' Asylum, RE: My New DIY Passive Preamplifier (0.00)
Posted by fastcat on 2023-02-19, 09:06:41 (99.70.239.115)
opus64: The large black block has medium density felt pads that rub against the brass shafts for volume and input selection. They act as dampers to micro vibration that might arise in the shafts (and .......
9: Tweakers' Asylum, RE: My New DIY Passive Preamplifier (0.00)
Posted by fastcat on 2023-02-09, 18:30:52 (99.70.239.115)
Oops! I meant high pass filter at 94 Hz. The unit sounds quite good, and has good dynamics with my cables and equipment. .......
10: Tweakers' Asylum, RE: My New DIY Passive Preamplifier (0.00)
Posted by fastcat on 2023-02-09, 13:32:25 (99.70.239.115)
The resistor trick here is having 1/2W 100K Takman REY metal film resistors between the input and the wiper contact, and the wiper contact and ground. I believe this was first discovered by the late B .......
11: Tweakers' Asylum, RE: My New DIY Passive Preamplifier (0.00)
Posted by fastcat on 2023-02-09, 13:24:19 (99.70.239.115)
Minor AC exposure inside unit is no problem. Unit is kept buttoned up (top on), and as an audiophile with an electronics degree, I am well aware of what exposed AC can do. .......
12: Tweakers' Asylum, RE: My New DIY Passive Preamplifier (0.00)
Posted by fastcat on 2023-02-07, 14:09:51 (99.70.239.115)
It actually sounds more transparent than a previous passive unit that I built in 1988. I moved up to a 10K TKD pot with a resistor trick, and an Elma selector switch. Wiring is dead soft bare silver w .......
13: Tweakers' Asylum, My New DIY Passive Preamplifier (0.00)
Posted by fastcat on 2023-02-06, 14:28:57 (99.70.239.115)
Here are some shots of my newly built passive preamplifier. It also has a unity gain active buffer to output to a sub woofer: .......
14: Tweakers' Asylum, RE: Opinions sought on inductor type (0.00)
Posted by fastcat on 2022-10-28, 06:09:56 (99.70.239.115)
To all: Given that the speaker in question has an 89 dB/watt sensitivity, most of the time the power running through the 1 ohm resistor will likely be considerably less than 20 watts. Paralleling two .......
15: Tweakers' Asylum, RE: Opinions sought on inductor type (0.00)
Posted by fastcat on 2022-10-27, 18:55:28 (99.70.239.115)
Hello: I suspect that the wax may be a sort of damping treatment for the inductor, but not sure. Really good foil and Litz inductors should both be pretty good; I don't think any difference would be w .......
16: Digital Drive, RE: Longer Term Sonic Impressions of Audio Lab CDT6000 Transport? (0.00)
Posted by fastcat on 2022-09-30, 13:50:56 (99.70.239.115)
Kanedak: What specific fuse and power cord did you use with the CDT6000? I suspect that the isolation scheme that works for you (with the top weights) has created a physical isolation response that fa .......
17: Digital Drive, Longer Term Sonic Impressions of Audio Lab CDT6000 Transport? (0.00)
Posted by fastcat on 2022-09-29, 18:21:56 (99.70.239.115)
Does anyone have longer term evaluations of the CDT6000 transport? Things like imaging, localization, transparency, brightness or darkness, naturalness, neutrality, tonal accuracy, etc. Thanks in adva .......
18: Digital Drive, RE: Audiolab 6000CDT screw size (0.00)
Posted by fastcat on 2022-08-21, 07:42:34 (99.70.239.115)
dandaroy: If you can get a set of small torx screwdrivers (or bits that fit a driver) you are likely to find one that works, and if so, a torx head screw should not be hard to take out, unless it was .......
19: Digital Drive, RE: Audiolab 6000CDT screw size (0.00)
Posted by fastcat on 2022-08-20, 07:24:17 (99.70.239.115)
Dandaroy: Are you referring to the Torx screw socket size that hold the unit panels? fastcat .......
20: Vinyl Asylum, New Vinyl Sonic Ultrasonic Record Cleaning Machine? (0.00)
Posted by fastcat on 2022-08-19, 17:23:54 (99.70.239.115)
Hello: Does anyone know anything about the new vinyl-sonic ultrasonic record cleaning machine, as below: https://www.vinyl-sonic.com/ I also saw it on Kick starter recently. Thanks! .......
21: Digital Drive, Any Longer Term Listening Impressions for the Audio Lab CDT6000 Transport? (0.00)
Posted by fastcat on 2022-08-19, 17:22:05 (99.70.239.115)
Hello: Does anyone have any longer term in depth listening opinions about the Audio Lab CDT 6000 CD transport? Any specifics would also be helpful. Thanks! .......
22: Speaker Asylum, RE: A "loudspeaker system" is first and foremost a SYSTEM. (0.00)
Posted by fastcat on 2022-07-01, 13:48:33 (99.70.239.115)
I agree that drivers are of a very central importance.... but; I have heard speaker designs with very expensive drivers that failed the test of sounding musical, despite their acoustic pyrotechnics. A .......
23: Digital Drive, RE: Any Comments on Neotech NEVD-2001 Digital Coaxial Cable? (0.00)
Posted by fastcat on 2022-04-02, 12:08:15 (99.70.239.115)
Is there a connection or similarity between Kimber Kable Select KS-2020 and Neotech NEVD-2001 Digital Coaxial Cable? .......
24: Digital Drive, RE: Any Comments on Neotech NEVD-2001 Digital Coaxial Cable? (0.00)
Posted by fastcat on 2022-03-31, 16:31:15 (99.70.239.115)
Not blind, but I gave each a good comparison opportunity with the same recordings. I am very aware of the possibility of expectations ruling perceptions. And I was a non-believer, which is why I shopp .......
25: Digital Drive, RE: Any Comments on Neotech NEVD-2001 Digital Coaxial Cable? (0.00)
Posted by fastcat on 2022-03-31, 16:22:56 (99.70.239.115)
gusser: I was once a non-believer that various SPDIF 75 ohm cables could sound different. But after reading so much over the years about people hearing differences, I decided to try a low cost experim .......
26: Digital Drive, RE: Any Comments on Neotech NEVD-2001 Digital Coaxial Cable? (0.00)
Posted by fastcat on 2022-03-31, 14:54:51 (99.70.239.115)
zacster: I understand your sentiments, but I have heard differences between 75 ohm SPDIF cables - they don't sound the same! I wish they did all sound the same, which would make things much easier, an .......
27: Digital Drive, RE: Any Comments on Neotech NEVD-2001 Digital Coaxial Cable? (0.00)
Posted by fastcat on 2022-03-30, 18:03:46 (99.70.239.115)
The Neotech NEVD-2001 cable can be bought for about $25 per foot, and terminated by hand - VERY reasonable price in that case - no need to pay $1000..... .......
28: Digital Drive, Any Comments on Neotech NEVD-2001 Digital Coaxial Cable? (0.00)
Posted by fastcat on 2022-03-30, 13:11:44 (99.70.239.115)
Hello: Does anyone have any experience or comments on the sound quality of Neotech NEVD-2001 digital coaxial cable used for SPDIF connection? Thanks in Advance! .......
29: Vinyl Asylum, RE: The Fundamentals of Vibration Dampening (0.00)
Posted by fastcat on 2022-03-30, 13:03:42 (99.70.239.115)
sisterray: I worked in vibration and acoustics research for 33 years for a company called EAR in Indianapolis. I am also a long time audiophile. If you are going to use an U-Turn Orbit turntable, I wo .......
30: Digital Drive, Open Question about Sound Differences in CD transports (0.00)
Posted by fastcat on 2022-03-30, 12:43:09 (99.70.239.115)
Hello to all: I have an open question to anyone about the subject of sonic differences between various CD transports. Some people believe that "ones and zeros are all just ones and zeros" (all transpo .......
31: Digital Drive, RE: Audiolab 6000cdt (0.00)
Posted by fastcat on 2022-02-18, 09:51:49 (99.70.239.115)
s.a.b. It would be interesting if you posted a short review here in this forum thread as to your listening impressions of the Audiolab CDT transport using both of the connections (optical and spdif). .......
32: Digital Drive, RE: Cd laser (0.00)
Posted by fastcat on 2021-12-09, 17:34:10 (99.70.239.115)
Take the cover off the player, turn it on, and press the tray open button. Locate the laser lens (just behind the center disc spindle) and press the tray close button. Watch for a red dot (laser) in t .......
33: Tweakers' Asylum, RE: Audiolab 6000CDT Mods (0.00)
Posted by fastcat on 2021-11-03, 17:01:25 (99.70.239.115)
I suspect that replacing the 3 terminal regulators on the board ( the 3 heat sinks? ) with discrete regulators (like Sparko labs) might provide another boost, and they are likely to fit right in. As y .......
34: Tweakers' Asylum, RE: Thumbs-up Schottky Diode Audiolab 6000cdt Transport Upgrade (0.00)
Posted by fastcat on 2021-09-25, 11:18:51 (99.70.239.115)
If the diodes made a difference in the sound, it had something to do with the reduced switching noise that they have. Given that, it would not be out of place to assume that high performance & very lo .......
35: Tweakers' Asylum, RE: Thumbs-up Schottky Diode Audiolab 6000cdt Transport Upgrade (0.00)
Posted by fastcat on 2021-09-23, 16:24:43 (99.70.239.115)
Jonesy: Did the brightness go down after the diode change? Have you found some digital cables to sound warmer and less bright than others? .......
36: Tweakers' Asylum, RE: Thumbs-up Schottky Diode Audiolab 6000cdt Transport Upgrade (0.00)
Posted by fastcat on 2021-09-22, 18:55:20 (99.70.239.115)
Now that you have listened to the 6000 for a while, what do you think of it's sonics compared to other transports? I have heard that it is a little on the bright (detailed?) side. What do you think? : .......
37: Tweakers' Asylum, RE: Thumbs-up Schottky Diode Audiolab 6000cdt Transport Upgrade (0.00)
Posted by fastcat on 2021-09-22, 14:29:54 (99.70.239.115)
Where are you getting the information about tweaking the 6000? .......
38: Tweakers' Asylum, RE: Thumbs-up Schottky Diode Audiolab 6000cdt Transport Upgrade (0.00)
Posted by fastcat on 2021-09-15, 16:50:13 (99.70.239.115)
Looks like there are at least 3 regulators on the board... I suspect that regulators with lower noise and better regulation ( like the Sparko labs ) would improve the performance of the transport. Cas .......
39: Tweakers' Asylum, RE: Thumbs-up Schottky Diode Audiolab 6000cdt Transport Upgrade (0.00)
Posted by fastcat on 2021-09-15, 14:06:06 (99.70.239.115)
Keep us posted on the mod progress of this transport! Better capacitors will likely improve things; I would bet that installing some of the newest discrete 3 terminal regulator drop in units ( Belleso .......
40: Tweakers' Asylum, RE: How about for an SU2? --FOUND THIS THAT MAY HELP (0.00)
Posted by fastcat on 2021-07-20, 09:28:58 (99.70.239.115)
Where can the transformer used be acquired? What are the transformer specs? Thanks! .......
41: Tweakers' Asylum, RE: I'm finding the "how"... (0.00)
Posted by fastcat on 2021-07-01, 18:21:48 (99.70.239.115)
I have read that Bob was very good with picking particular components for the sound quality they produced - for the circuits that John designed. Do you know anything about all that, or how Bob got to .......
42: Tweakers' Asylum, RE: Any idea of the theory behind doing this? (nt) (0.00)
Posted by fastcat on 2021-06-21, 17:38:03 (99.70.239.115)
I think the idea behind the addition of the resistors (which are 10X the value of the pot itself) is to have a hard soldered parallel resistor network such that the actual pot acts as a variable shunt .......
43: Tweakers' Asylum, The Bob Crump TKD pot mod for the blowtorch preamp (0.00)
Posted by fastcat on 2021-06-14, 14:45:29 (99.70.239.115)
Hello: Does anyone remember what the specifics were for the resistor mod that Bob Crump did to the TKD stereo pot that was used in John Curl's blowtorch pre-amplifier? Thanks! .......
44: Tweakers' Asylum, RE: IsoDamp C-1002 Adhesive to fix between MDF shelves? (0.00)
Posted by fastcat on 2021-02-16, 09:00:22 (99.70.239.115)
Tweaker465: I have seen transmissibility curves for the C1002 footers (available at Michael Percy) in the lab, and they are a very good bang for the buck as an isolator. .......
45: Tweakers' Asylum, RE: IsoDamp C-1002 Adhesive to fix between MDF shelves? (0.00)
Posted by fastcat on 2021-02-16, 06:34:12 (99.70.239.115)
Brad225: The rack you built is quite nice! And the 200 pound weight will be good for component isolation. .......
46: Tweakers' Asylum, RE: IsoDamp C-1002 Adhesive to fix between MDF shelves? (0.00)
Posted by fastcat on 2021-02-16, 06:30:43 (99.70.239.115)
Tweaker456: We never did any studies on the self damping qualities of Bamboo during my time in R&D at EAR. It is true that some woods (and MDF) have lower degrees of resonant behavior. The most import .......
47: Tweakers' Asylum, RE: IsoDamp C-1002 Adhesive to fix between MDF shelves? (0.00)
Posted by fastcat on 2021-02-15, 18:41:46 (99.70.239.115)
Tweaker465: I put in 33 years in the EAR technical department doing R&D in acoustics and vibration. Both spray on and painted on adhesive layers will work with C1002 ( i have done it myself with excel .......
48: Tweakers' Asylum, RE: IsoDamp C-1002 Adhesive to fix between MDF shelves? (0.00)
Posted by fastcat on 2021-02-14, 14:48:14 (99.70.239.115)
Flyguy: For a constrained system to work properly, the center material (in this case C1002-06) needs to be fully bonded on both sides to the wood surfaces. In a constrained damping system, resonant en .......
49: Tweakers' Asylum, RE: IsoDamp C-1002 Adhesive to fix between MDF shelves? (0.00)
Posted by fastcat on 2021-02-12, 17:11:49 (99.70.239.115)
FlyGuy: I had an entire career doing sound and vibration at EAR who makes the Isodamp C1002-06. A GOOD choice to do a constrained layer shelf! You have about two choices: If you are getting the C1002- .......
50: Tweakers' Asylum, RE: Contact cleaner, bargain priced. (0.00)
Posted by fastcat on 2021-02-03, 09:14:27 (99.70.239.115)
Duster: This is a good product at a good price! Regarding Caig's DeOxit, I believe that this cleaner has a fairly strong chemical deoxidizer content, and is even better for removing oxides from metal .......
51: Tweakers' Asylum, RE: EAR Isodamp C-1002 equiptment feet (0.00)
Posted by fastcat on 2020-10-25, 09:46:59 (99.70.239.115)
Willsw: In the transmissibility graph, the peak is at a lower frequency range. To some extent, where the peak frequency is at will depend on the mass that is being isolated. Typically, the higher the .......
52: Tweakers' Asylum, RE: EAR Isodamp C-1002 equiptment feet (0.00)
Posted by fastcat on 2020-10-24, 06:59:43 (99.70.239.115)
Duster: For larger components there is an EAR isolation footer that is 1.5" diameter by 0.75" height that will handle 10-20 pounds. Parts Connexion and Michael Percy have them. It would be interest .......
53: Tweakers' Asylum, RE: EAR Isodamp C-1002 equiptment feet (0.00)
Posted by fastcat on 2020-10-23, 20:02:24 (99.70.239.115)
To All: I spent a 33 year R&D career at EAR in the field of acoustics and vibration. And I am very familiar with C1002 isolation feet. One of the best features of the Isodamp isolating feet is that t .......
54: Tweakers' Asylum, RE: What is a good isolation footer? (0.00)
Posted by fastcat on 2020-05-29, 16:56:02 (99.70.239.115)
There are many forms of isolation devices on the market. Some one with a test shaker system, accelerometers, and an FFT signal analyzer could easily tell which ones are really doing what they are supp .......
55: Amp/Preamp Asylum, RE: McCormack DNA125 Amplifier Question! (0.00)
Posted by fastcat on 2020-05-03, 17:34:50 (99.70.239.115)
Thanks to all for the very interesting and variable reply's! I have had a DNA125 for some years, and it drives a fairly easy speaker load in my case. After spending years listening to it, this is what .......
56: Amp/Preamp Asylum, McCormack DNA125 Amplifier Question! (0.00)
Posted by fastcat on 2020-05-02, 13:14:06 (99.70.239.115)
Hello to all: Regarding the Steve McCormack DNA125 SS power amplifier, Conrad Johnson stopped making them years ago, though they are very popular on the used market. People who have reviewed this ampl .......
57: Digital Drive, RE: Further Impressions Audiolab 6000 cd transport (0.00)
Posted by fastcat on 2020-01-13, 16:31:57 (99.70.239.115)
Yes: I would enjoy hearing more about your impression of the CDT 6000 transport, as I have considered buying one. Many Thanks! .......
58: Digital Drive, RE: 1st impressions (0.00)
Posted by fastcat on 2020-01-07, 17:23:30 (99.70.239.115)
Jonesy: Would like to hear more about your impressions of the 6000 CDT as you continue to listen to it. It would be good if you also mentioned what other transport sources you are comparing the 6000 w .......
59: Tweakers' Asylum, RE: EAR Isodamp C-1002 vs rubber and cork footers (0.00)
Posted by fastcat on 2019-12-02, 13:12:25 (99.70.239.115)
I had a career at EAR doing R&D work, and did many tests on C1002. This material, when molded in the shape of an isolator (I believe that they can be had at Michael Percy and Parts Connexion) can be a .......
60: Vinyl Asylum, RE: The Electromechanical Interface & "Digital" Records (0.00)
Posted by fastcat on 2019-09-27, 15:01:47 (99.70.239.115)
I have been reading this discussion... I have also noticed that careful copying of vinyl records to CD burning sounds very much like the original source. The most interesting thing here is: - Copy to .......
61: Digital Drive, RE: CD mats: how do they improve the sound? (0.00)
Posted by fastcat on 2019-09-23, 12:10:32 (99.70.239.115)
CD mats will act mostly as dampers to vibrations that are set up in the spinning CD disc. Vibrations are going to cause a CD laser servo system to work harder to stay on track and sharply focused. Sha .......
62: Tweakers' Asylum, RE: Question On HD Speaker Input Filters (0.00)
Posted by fastcat on 2019-06-29, 13:32:59 (99.70.239.115)
Awe-d-o-file: Thanks for the speaker filter info! Did you used to sell small "processed" quartz crystals for audio use? Do you know anywhere that you would recommend to purchase such crystals? Thanks! .......
63: Tweakers' Asylum, Question On HD Speaker Input Filters (0.00)
Posted by fastcat on 2019-06-28, 18:23:22 (99.70.239.115)
Having read about the use of speaker filters at the input terminals (typically a series 10 ohm resistor and 0.01 film capacitor), I have a question: Is it even better to have such filters at the ampli .......
64: Digital Drive, RE: Also consider the Audiolab 6000 CDT (0.00)
Posted by fastcat on 2019-06-21, 06:52:02 (99.70.239.115)
Ken: Yes, I would agree that transports can be a puzzle. I expected my Sony Blu Ray player would not sound very good from it's digital out jack, but it really surprised me. All this makes it hard to k .......
65: Digital Drive, RE: Also consider the Audiolab 6000 CDT (0.00)
Posted by fastcat on 2019-06-20, 18:37:43 (99.70.239.115)
Ken: Thanks for your input on the Audio lab! It sounds like you give slight edges to the unit over the Cambridge, except for not having quite the sense of propulsive drive in the music that the Cambri .......
66: Digital Drive, RE: Also consider the Audiolab 6000 CDT (0.00)
Posted by fastcat on 2019-06-20, 14:41:15 (99.70.239.115)
Ken: Do you consider the Audio Lab transport as sounding better than the Cambridge CXC transport? If yes, can you describe the improvement? Thanks! .......
67: Vinyl Asylum, RE: How old is Michael Fremer? (0.00)
Posted by fastcat on 2019-04-16, 12:39:32 (99.70.239.115)
Just a bit beyond 70. .......
68: Speaker Asylum, RE: When did you realize your speakers weren't good? (0.00)
Posted by fastcat on 2019-03-17, 14:23:24 (99.70.239.115)
I knew something was wrong with my speakers in the 70's the first time I heard a pair of Dalquist DQ10s. The imaging blew me away!!! .......
69: Tweakers' Asylum, RE: Capacitor upgrade in amplifiers (0.00)
Posted by fastcat on 2019-02-24, 17:09:33 (99.70.239.115)
Replacing your standard electrolytic units with high grade Mundorf's might make a difference - I once read about an experiment where the power electrolytic capacitors in an amplifier were replaced wit .......
70: Vinyl Asylum, RE: How many of you listen to boxes with one inch tweeters? Or smoke dope and drink to "improve the experience (0.00)
Posted by fastcat on 2018-12-31, 11:16:00 (99.70.239.115)
Travis: I know what you mean!!! Even a cheap stereo system can sound much better under the "right" circumstances! Smiles.... .......
71: Vinyl Asylum, RE: Could someone explain the one hour warm up of vinyl playback? (0.00)
Posted by fastcat on 2018-12-31, 11:13:57 (99.70.239.115)
Hello to all! After years of experimenting with warm ups, I have generally found that doing an 8 hour warm up (morning to mid evening) definitely sounds better than the first half hour or 1 hour. And .......
72: Vinyl Asylum, RE: Does it make sense to digitize master tapes? (0.00)
Posted by fastcat on 2018-12-08, 13:43:03 (99.70.239.115)
This is the idea that I have always had for the issue of preserving the Beatles catalog (or any other very valuable music catalog): 1. Have tape experts evaluate the physical and playback condition of .......
73: Cable Asylum, Audiophile AC Power Cable Question (0.00)
Posted by fastcat on 2018-11-29, 11:46:25 (99.70.239.115)
A question in my mind about audiophile AC power cables and reasons that they sound better than normal skimpy power cords (that will still handle the current easily). Beyond possible noise filtering pr .......
74: Digital Drive, RE: Do You Mean Professional ADCs? (0.00)
Posted by fastcat on 2018-11-29, 07:07:13 (99.70.239.115)
In effect you are saying that there are recording and mastering professionals out there that are not using proper approaches when down sampling to 44.1. This would NOT be a big surprise, since there a .......
75: Digital Drive, RE: Do You Mean Professional ADCs? (0.00)
Posted by fastcat on 2018-11-28, 06:21:02 (99.70.239.115)
Todd: What you seem to be saying is that down sampling from 96 or 192 to 44.1 is not as good as going from the source directly into a 44.1 conversion. Do you/have you found any technical evidence on t .......
76: Tweakers' Asylum, RE: Best placement for an attenuator (0.00)
Posted by fastcat on 2018-11-27, 18:40:42 (99.70.239.115)
Based on what you have said, I would try a passive 10K pot between the preamp and the power amplifier. If your connecting cables are low capacitance, and not very long, this should work out well. I us .......
77: Tweakers' Asylum, RE: Best placement for an attenuator (0.00)
Posted by fastcat on 2018-11-27, 15:44:39 (99.70.239.115)
All that might depend on the character of your preamp output. If it can sustain a low distortion, high current output into a 1K load, then a 1K pot might work very well going into the amplifier withou .......
78: Tweakers' Asylum, RE: Best placement for an attenuator (0.00)
Posted by fastcat on 2018-11-26, 17:51:41 (99.70.239.115)
There are things to consider when putting the attenuator between the pre-amplifier and the power amplifier: if your pre-amplifier has a very low output impedance, and you use low capacitance cables, t .......
79: Tweakers' Asylum, RE: Best placement for an attenuator (0.00)
Posted by fastcat on 2018-11-26, 11:11:21 (99.70.239.115)
If you have a pre-amplifier, why do you need the 25K pot box in the mix, unless your source has an output voltage that needs to be brought down before a preamplifier or power amplifier? .......
80: Digital Drive, RE: When did professional DACs improve? (0.00)
Posted by fastcat on 2018-11-24, 14:48:13 (99.70.239.115)
I would suspect that by the time the Pacific Microsonics model 2 HDCD ADC was put on the market that the analog to digital conversion (in the hands of competent operators and good engineers) became qu .......
81: Vintage Asylum, RE: When I listen to popular genre recordings like say "Waiting for Columbus" by Little Feat (0.00)
Posted by fastcat on 2018-11-24, 14:39:41 (99.70.239.115)
Uncle Mike: The L100 was my dream speaker when I heard it in the early 70's. And it is a great classic speaker of it's era (and well built). Great for rock music! As I became an audiophile with more e .......
82: Tweakers' Asylum, RE: Did you even bother to read the thread? (0.00)
Posted by fastcat on 2018-11-21, 13:26:01 (99.70.239.115)
Dave: Are your capacitor test results available on the web? Thanks! .......
83: Tweakers' Asylum, RE: LM4562's (0.00)
Posted by fastcat on 2018-11-16, 17:27:57 (99.70.239.115)
To All: Regarding the op-amp issue in reference to speed, I think that an op-amp should be able to slew at a rate that can easily keep up with (be able to precisely duplicate) real world musical trans .......
84: Tweakers' Asylum, RE: +1 for Sparkos Labs (0.00)
Posted by fastcat on 2018-11-16, 08:12:21 (99.70.239.115)
A good idea to try an op-amp with similar speed to see how it works out, if you have some. The oscillation thing with very fast op-amps is something that people on diyaudio.com have spoke about, and t .......
85: Tweakers' Asylum, RE: +1 for Sparkos Labs (0.00)
Posted by fastcat on 2018-11-15, 17:05:49 (99.70.239.115)
These units look interesting; on the other hand, there is the possibility of oscillation due to the very fast slew rate (120V/us), depending on circuitry and layout around the op-amp. .......
86: Cable Asylum, RE: Ping: Jon Risch (0.00)
Posted by fastcat on 2018-11-11, 16:59:36 (99.70.239.115)
Duster: In the rare cases where I have come across inappropriate reply's or unreasonable aggression, I simply ignore it. If people cannot keep their comments and questions within reasonable bounds, th .......
87: Cable Asylum, RE: Open question to Duster (0.00)
Posted by fastcat on 2018-10-30, 19:37:45 (99.70.239.115)
I have a 33 year history in the acoustics industry, and have marveled at the fact that the ear can become quite educated and sensitive to changes in frequency, level, and character. I once believed as .......
88: Digital Drive, RE: Digitizing my vinyl collection (0.00)
Posted by fastcat on 2018-10-07, 19:02:29 (99.70.239.115)
John: Thanks for your confirmation / insight on the digital sound. As I was using an A to D of less quality than even some of the early digital studio converters, I must assume that people were doing .......
89: Vintage Asylum, axial capacitors (0.00)
Posted by fastcat on 2018-10-07, 09:34:32 (99.70.239.115)
Try Madisound for speaker capacitors. .......
90: Digital Drive, RE: Digitizing my vinyl collection (0.00)
Posted by fastcat on 2018-10-06, 17:45:37 (99.70.239.115)
John: Regarding your claim that LPs transferred to digital sound more or less the same as the LP; Years ago I did some very careful digitizing of a small group of LPs by feeding the phono preamp signa .......
91: Radio Road, RE: When does a tuner need an alignment? (0.00)
Posted by fastcat on 2018-09-30, 12:01:40 (99.70.239.115)
Tim: Thanks for your very detailed response to my question! .......
92: Radio Road, RE: When does a tuner need an alignment? (0.00)
Posted by fastcat on 2018-09-29, 17:29:10 (99.70.239.115)
Steve: I found an on-line article about FM tuner self noise with ND: http://www.ham-radio.com/k6sti/hdrsn.htm The catch for me would be figuring out where the FM detector ends, and the Stereo decoder .......
93: Radio Road, RE: When does a tuner need an alignment? (0.00)
Posted by fastcat on 2018-09-29, 16:27:45 (99.70.239.115)
Steve: I do have a vintage tuner (Sansui TU-217), and the station does broadcast in HD too. Is there a way out that makes sense for this tuner, or similar? Thanks! .......
94: Radio Road, RE: When does a tuner need an alignment? (0.00)
Posted by fastcat on 2018-09-29, 14:39:23 (99.70.239.115)
Steve: Thanks for the input! If I were experiencing a higher than expected background noise level with a station near the very far end of the tuning scale (88.7 in this case), would that possibly indi .......
95: Radio Road, When does a tuner need an alignment? (0.00)
Posted by fastcat on 2018-09-29, 12:16:45 (99.70.239.115)
Hello to all: I am wondering as to just what operating characteristics indicate that a tuner is in need of an alignment. Thanks in advance! Dan .......
96: Tweakers' Asylum, RE: TPA6120A2 headphone amplifier chip (0.00)
Posted by fastcat on 2018-09-23, 15:25:41 (99.70.239.115)
Duster: We had a pair of HD580 headphones at work years ago, and they were very impressive at that time for their very fine sound, compared to most headphones I had heard at that point. I agree that t .......
97: Tweakers' Asylum, RE: TPA6120A2 headphone amplifier chip (0.00)
Posted by fastcat on 2018-09-22, 15:50:18 (99.70.239.115)
Duster: The OPA1611 looks to have really good specs. And there is the extended output current with this module... I bet they have an external transistor output that can handle the 200 mA output curren .......
98: Tweakers' Asylum, RE: TPA6120A2 headphone amplifier chip (0.00)
Posted by fastcat on 2018-09-22, 13:06:31 (99.70.239.115)
Duster: The OPA1622 looks quite interesting, and I see the adapter packages on eBay. Have you done (by chance) a run off between a chip like this and the OPA627 (widely praised)? On another point, hav .......
99: Tweakers' Asylum, RE: TPA6120A2 headphone amplifier chip (0.00)
Posted by fastcat on 2018-09-18, 12:01:29 (99.70.239.115)
Duster: I do not see any way that the headphone amp. chip would be messed up if it is being fed by a higher current output capable op-amp. The input resistance of the TPA6120A2 is listed as 300,000 oh .......
100: Tweakers' Asylum, RE: Does it improve the bass response if I use the lower DCR woofer inductor (0.00)
Posted by fastcat on 2018-09-18, 11:39:10 (99.70.239.115)
Regarding your inductor change; the new unit will inject less series resistance into the circuit, which may improve the damping factor applied to your woofer. On the other hand, crossover circuits are .......
101: Tweakers' Asylum, RE: whole house surge protectors w/filter (0.00)
Posted by fastcat on 2018-09-14, 15:54:02 (99.70.239.115)
Jack D: Can you post a pic of your surge system, and the exact model that you have? Thanks! .......
102: Tweakers' Asylum, RE: Good news (I think). (0.00)
Posted by fastcat on 2018-09-14, 15:52:32 (99.70.239.115)
Duster: As to future risk with the transformer, I think you will be fine if you include the 3 amp. inline SB fuse, and watch over the unit without the lid for a period of time to check for undue heati .......
103: Tweakers' Asylum, RE: Toriodal transformer overheating (0.00)
Posted by fastcat on 2018-09-12, 19:22:54 (99.70.239.115)
Duster: Be sure to tell me about the power cord that you are experimenting with and fabricating.... DRS .......
104: Tweakers' Asylum, RE: Toriodal transformer overheating (0.00)
Posted by fastcat on 2018-09-12, 18:06:36 (99.70.239.115)
Duster: With luck you will find a "healthy" AC RMS voltage across the 2 secondary transformer leads near or a bit above 20 VAC RMS. I agree with batman that you may be OK with the transformer if the v .......
105: Tweakers' Asylum, RE: Good news (I think). (0.00)
Posted by fastcat on 2018-09-12, 13:58:01 (99.70.239.115)
Duster: The simplest thing to try in checking the x-former might be to measure the no load AC voltage on the wires of the transformer secondary. As this is a 12 VDC power supply, the RMS AC voltage ac .......
106: Tweakers' Asylum, RE: whole house surge protectors w/filter (0.00)
Posted by fastcat on 2018-09-11, 06:48:58 (99.70.239.115)
Can you elaborate about your filter installation, the results, and the model you installed? Thanks! .......
107: Tweakers' Asylum, RE: Toriodal transformer overheating (0.00)
Posted by fastcat on 2018-09-10, 18:18:51 (99.70.239.115)
Duster: I am getting the Studer900 30 watt / 12 VDC to power a Plextor Premium U external CD burner (replacing a very small switcher supply). I cannot build a good linear supply for as little as $60.0 .......
108: Tweakers' Asylum, RE: Toriodal transformer overheating (0.00)
Posted by fastcat on 2018-09-10, 18:08:50 (99.70.239.115)
Duster: All you need to do is get an "in-line" fuse holder (5x20mm) (often insulated), and splice it into the hot lead wiring going from the IEC inlet to the x-former. I would suspect that a 3 amp. sl .......
109: Tweakers' Asylum, RE: Toriodal transformer overheating (0.00)
Posted by fastcat on 2018-09-10, 17:34:13 (99.70.239.115)
Duster: Is this supply the bigger Asian Studer900 30 watt unit? As in 12 VDC @ 2.5 amps? Is your power supply still fairly new? irregardless, if there is no fuse in the supply, that could explain why .......
110: Tweakers' Asylum, RE: Toriodal transformer overheating (0.00)
Posted by fastcat on 2018-09-10, 16:18:27 (99.70.239.115)
Duster: It sounds like the power supply did not have a fuse in it if the transformer got that hot. Either a shorted turn in the x-former, or something else downstream is drawing too much current - eit .......
111: Tweakers' Asylum, RE: Noise specs (0.00)
Posted by fastcat on 2018-09-06, 12:28:05 (99.70.239.115)
Duster: Regarding the purchase of the Studer900 power supply (12 VDC, 30 watt) from AliExpress, their listing is for 220 VAC input. Can they do 110VAC input if requested in the purchase process? Thank .......
112: Tweakers' Asylum, RE: Capacitor upgrade with higher voltage rating. (0.00)
Posted by fastcat on 2018-07-16, 18:23:18 (99.70.239.115)
Duster: These are very good quality capacitors, so I see no problem with long term stability. Do remember to do a post about the changes you hear after you make the mod. I have been tinkering with aud .......
113: Tweakers' Asylum, RE: Capacitor upgrade with higher voltage rating. (0.00)
Posted by fastcat on 2018-07-16, 16:55:00 (99.70.239.115)
Duster: For sure the Nichicon 50V units will work; it is more of a matter of how the exchange will affect the sound (if at all) in your circuit, and your taste in what constitutes an improvement. DRS .......
114: Tweakers' Asylum, RE: Maximizing Magnet Efficiency of Coil Speakers and Toroidal Transformers (0.00)
Posted by fastcat on 2018-07-16, 16:47:39 (99.70.239.115)
DG: You mention using the shielding material on speaker drivers. Do you create a wrap around the rear magnet and back? Also, how do you wrap crossover coils; around the perimeter and top/bottom, or ot .......
115: Speaker Asylum, RE: Fried Beta (0.00)
Posted by fastcat on 2018-02-25, 16:13:17 (99.70.239.115)
mg16: Regarding your question about the "best" Fried speakers that were made while Fried himself was in charge, there are several: Fried Studio IV ( a 2 way TL with 8" bass/mid and 3/4" dome tweeter ) .......
116: Shady Lane, Beware of Timber Nation (audio racks) (0.00)
Posted by fastcat on 2018-02-12, 14:59:16 (99.70.239.115)
To anyone contemplating the purchase of an audio rack from this vendor: I contracted Chris at Timber Nation last Fall to build me a 4 shelf maple rack. I sent a set of very neat and specific plan draw .......
117: Vintage Asylum, RE: Cleaning Scott faceplates, any ideas? (0.00)
Posted by fastcat on 2018-01-03, 11:51:20 (99.70.239.115)
Hello: If your face plate is actually brass on the surface that has oxides on it (or similar) You might try painting a thin layer of Caig Deoxit on the entire surface with a soft brush, and allowing t .......
118: Radio Road, RE: cool -- but... why? (0.00)
Posted by fastcat on 2017-09-23, 16:10:35 (99.70.239.115)
mhardy: The whole idea is that I enjoyed the challenge of restoring and old bottom line tuner, and seeing how clever I could be about upgrading it's performance. Overall cost was on the low side - jus .......
119: Radio Road, Restoration - Update of Sansui TU-217 (0.00)
Posted by fastcat on 2017-09-22, 16:53:23 (99.70.239.115)
Hello to all: After reading about the sound of the older analog tuners, I decided to buy a used Sansui TU-217 on eBay for $50, and do a restoration/update, based on the praise from the people at .......
120: Digital Drive, RE: Super Important Question That Has Parallels Today (0.00)
Posted by fastcat on 2017-06-19, 17:15:07 (99.70.239.115)
Charles: You are right about the need for ongoing improvement in A/D converters! I do think that if HDCD had caught on big, that Keith Johnson would have also created better A/D converters beyond the .......
121: Digital Drive, RE: Thanks for the Clarity on HDCD - Charles post is a must read (0.00)
Posted by fastcat on 2017-06-19, 14:25:51 (99.70.239.115)
My comments about the HDCD A/D converter has no relation to the fact that other excellent converters eventually came out. That is an obvious given. As far as DSD and analog, the debate over which medi .......
122: Digital Drive, RE: Thanks for the Clarity on HDCD - Charles post is a must read (0.00)
Posted by fastcat on 2017-06-19, 12:59:20 (99.70.239.115)
Charles: Given the sonic superiority of the PMD model 1 and 2 when they came into existence, do you think the the high end audio world would have been better off if there had been a wide spread implem .......
123: Tweakers' Asylum, Contact Enhancers (0.00)
Posted by fastcat on 2016-06-20, 17:44:29 (99.70.238.156)
Heool! Of the contact enhancers (not cleaners) available on the market, which of these are likely the longest lived in terms of positive effect before any cleaning and reapplication is necessary? Than .......
124: Cable Asylum, UP OCC tonearm wiring??? (0.00)
Posted by fastcat on 2016-06-20, 17:42:39 (99.70.238.156)
Hello: Does anyone know of sources of UP-OCC tonearm wiring (the type that is inside the tonearm)? Thanks! .......
125: Speaker Asylum, RE: Fried Model RIIs....The Bud Fried Thing (0.00)
Posted by fastcat on 2015-07-22, 18:47:55 (99.70.238.156)
To All: I remember the personally abusive nature of I.M. Fried firsthand; That said, I also remember a number of demonstrations of some of his better speakers when they were being sold in shops. They .......
126: Tweakers' Asylum, To Unclestu about the ferro fluid tweak (0.00)
Posted by fastcat on 2015-02-22, 15:23:14 (99.70.238.156)
Unclestu: I find you work with the ferro fluid on the laser to be quite interesting! Is it possible that you could start a thread where you would have 1 or 2 very close up pictures of the coils, and w .......
127: Tweakers' Asylum, RE: Damping the Foating CDP Laser-Track Tray (0.00)
Posted by fastcat on 2015-02-21, 10:48:12 (99.70.238.156)
Unclestu: What kind of ferro fluid do you use (type/viscosity), and where can it be obtained? Many Thanks! Dan .......
128: Vinyl Asylum, How good the latest VPI Traveler? (0.00)
Posted by fastcat on 2014-11-21, 17:01:32 (99.70.238.156)
Hello! Does anyone have any opinions on how good the latest (and apparently last) version of the VPI Traveler is sonically? Is there anything else at slightly over the 1K mark that competes or is bett .......
129: Vinyl Asylum, VPI Traveler Motor Drive Question (0.00)
Posted by fastcat on 2014-11-16, 14:27:40 (99.70.238.156)
I have heard that the Traveler has an AC regeneration circuit that is powered by a DC wall wart PS, and that this runs the AC sync motor on the Traveler. Does anyone know anything about the regenerati .......
130: Tweakers' Asylum, RE: NEC multispin caddy cork damping (0.00)
Posted by fastcat on 2014-09-22, 17:17:12 (99.70.238.156)
How thick was your cork that you put on the top center circle? .......
131: Tweakers' Asylum, RE: QUERY (0.00)
Posted by fastcat on 2014-07-27, 08:43:12 (99.70.238.156)
Unclestu: Tell us more about the tweak! Or do you have a link to the original that you can post? Thanks! .......
132: Vinyl Asylum, AT 120e Cartridge loading? (0.00)
Posted by fastcat on 2014-02-17, 17:39:07 (99.70.238.43)
Hello: With the talk about the AT120e going on, has anyone found an ideal loading for this cartridge with the 120e stylus in terms of resistance and capacitance that gives a fairly smooth & flat high .......
133: Cable Asylum, RE: Clear DayShotguns w Solid State gear, any users? (0.00)
Posted by fastcat on 2014-01-04, 16:06:41 (99.70.238.43)
I use a pair of the double shotguns with an all solid state system that has a McCormack DNA125. The sound is pretty neutral and smooth. No brightness. The doubles were one of the best upgrades that I .......
134: Cable Asylum, Bulk AC Power Cable Recommendations @ $20/Ft or Less (0.00)
Posted by fastcat on 2013-12-20, 13:36:13 (99.70.238.43)
Hello: Does anyone have a good recommendation for a bulk AC power cable that costs no more than about $20 per foot, and will produce an all around good sound as an AC cable for power distribution from .......
135: Cable Asylum, RE: What is you're experience with clear day cables (0.00)
Posted by fastcat on 2013-01-26, 08:01:56 (69.219.236.190)
Sudz1234: I found Clear day double shotguns to be excellent from top to bottom, and a true bargain. Paul is also the best audio person that I have ever dealt with. .......
136: Tweakers' Asylum, RE: Record Cleaning with Wood Glue (0.00)
Posted by fastcat on 2012-12-17, 15:49:18 (70.236.44.111)
Anyone have comments on just how good record cleaning with glue can be compared with record cleaning machines? Do repeats help? Thanks! .......
137: Cable Asylum, RE: Clear Day - Outstanding Customer Service (0.00)
Posted by fastcat on 2012-12-01, 16:05:24 (70.225.142.18)
I have had contact with Paul Laudati, of Clear Day on a number of occasions, and besides loving the performance of his double shotguns, his customer service is the best that I have ever encountered in .......
138: Vintage Asylum, RE: Thanks for the link!nt. (0.00)
Posted by fastcat on 2012-10-28, 18:37:14 (69.219.237.134)
Brian: The ML-31.5 transport (very similar to the ML31) was even better!!! Wonder how these units stack up against the very expensive Teac Esoteric CD transports (their drives are sensational build qu .......
139: Vintage Asylum, RE: 10 Bids and still going strong for this piece of audio? (0.00)
Posted by fastcat on 2012-10-28, 16:04:29 (70.225.131.216)
Read this review of the 31 to see just how good it really is: http://www.stereophile.com/cdplayers/693ml31/index.html .......
140: Cable Asylum, RE: Kudos for Clear Day Cables! (0.00)
Posted by fastcat on 2012-10-16, 16:13:21 (69.219.235.75)
Changing to the Clear Day double shotgun transformed my system to a degree that I did not think possible for under $ 500.00. No need (or desire) to seek anything else to replace them. A major bargain! .......
141: Tweakers' Asylum, Capacitor Bypass for Speaker Fuses? (0.00)
Posted by fastcat on 2010-04-04, 12:24:56 (70.236.78.27)
Hello to all: Has anyone tried installing HQ bypass capacitors around speaker input fuses? I have heard of this being done to the rail fuses in power amplifiers. Any chance that a high quality film c .......
142: Cable Asylum, What is TRT Wonder Wire? (0.00)
Posted by fastcat on 2010-03-27, 13:22:30 (76.240.222.240)
hello to all: Does anyone know what TRT wonder wire actually is? I am already aware that it is a "19 GA copper wire with silver plating and a special crystal structure" Does anyone know what the struc .......
143: Digital Drive, Surprise At The Sound of Old DAC V.S. Newer Units (0.00)
Posted by fastcat on 2010-02-17, 15:36:39 (99.137.125.75)
Hello: I have one of the old (1997) Assemblage DAC 2.0 units (CS8412, PMD100, PCM 1702)from Sonic Frontiers. It has had a number of mods (op-amps, HP electrolytic capacitors, damping, HP jacks, and ot .......
144: Cable Asylum, Power Cables For McCormack DNA125 (0.00)
Posted by fastcat on 2010-02-14, 06:50:18 (64.255.115.132)
Hello: Does anyone have any recommendations for a compatible AC power cable for the McCormack DNA-125 amplifier that compliments it sound qualities? Thanks in advance! fastcat .......
145: Cable Asylum, Oxidizing Copper Speaker cables? (0.00)
Posted by fastcat on 2009-12-11, 08:57:01 (76.240.215.120)
Hello to all: Does anyone know what the likely hood is of a copper based speaker cable becoming oxidized if the copper strands are encased in Teflon insulation? Is this going to be a problem with copp .......
146: Cable Asylum, Amplifier Internal Output Wiring? (0.00)
Posted by fastcat on 2009-05-18, 17:06:25 (70.236.65.16)
Hello to all: I am doing a mod job on my B&KST140, and want to change the internal output wiring. I have considered soft drawn silver/Teflon tubing from Handmade Electronics (perhaps too bright?); Won .......
147: Cable Asylum, Clear Day Speaker Cable Comments? (0.00)
Posted by fastcat on 2008-06-18, 18:00:42 (70.225.137.214)
Hello To All: Is there anyone out there who would care to post a reply with a short review of the Clear Day speaker cables (especially the shotgun)? Many Thanks In Advance! fastcat .......
148: Tweakers' Asylum, Choosing An Input Capacitor For Amplifier (0.00)
Posted by fastcat on 2008-04-25, 18:01:14 (69.219.231.253)
Hello to all! I want to put a 0.033 uF input film capacitor in my power amp (to get a 100 Hz high pass). Does anyone have any ideas as to some good choices (and why) that would cost no more than $20-3 .......
149: Cable Asylum, Has Anyone Tried The "Anti Cables" ? (0.00)
Posted by fastcat on 2006-07-16, 05:09:03 (168.215.194.219)
Hello to all: Has anyone tried the anti-cables that were so well reviewed in Absolute Sound? These are the 12 gauge copper speaker wires with very thin red insulation. Any opinions? Thanks! ::: TOPIC: .......
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