1: Analog Device AD8066 Opamp - Is there any benefit to Bias in Class A with FET ? (9.95)
Posted by dtm1962 on 2004-05-03, 19:08:54 (64.231.96.205)
I have modified my Pioneer 563 extensively and wondering if AD8066 would be a good candidate for Class A biasing using a FET's. I am using it in the analog output stage. I read that if the output stag .......

2: Re: Absolutely!... (9.95)
Posted by gads on 2004-01-28, 02:26:55 (81.218.211.149)
If you had to choose between the LM6172+Kemet NPO, and the AD8066+Kemet NPO, which would it be? BTW, for others who plan to install the AD8066, they do not work when 15V supplied! .......

3: Re: Absolutely!... (9.84)
Posted by Dad on 2004-01-28, 04:33:57 (64.132.174.20)
From what I'm hearing, I'd definately go with the AD8066. I'm guessing the bypass cap eliminated some serious spurious oscillations as the AD8066 now sounds full bodied and VERY dynamic. The LM6172 so .......

4: Anyone compared the AD8066 with the OPA2604? (9.77)
Posted by Aussie Geoff on 2004-04-05, 07:15:45 (218.214.15.211)
Hi, I have a home theatre processor that uses the SO-8 durface mounted OPA2604 OpAmps for the front channels and cheaper TL072 and JRC5532 opamps for the rear channels and normal stereo inputs. I am c .......

5: Re: Anyone compared the AD8066 with the OPA2604? (9.08)
Posted by dgs on 2004-04-05, 12:31:50 (203.134.97.15)
Hi aussie geoff, I have only played with changing op amps in my cd player so I can only speak from that side of things. Being a fellow aussie, I think I know the upgrade firm you are talking about.... .......

6: Re: The AD8066 IS much better than the 6172 with the same caps.... (8.95)
Posted by dgs on 2004-03-31, 11:42:20 (203.134.97.55)
When I was playing around with op amps in my old denon cd player, I tried the Ad826, Ad8066 and the lm6172. I much preferred the 8066 like 'dad'. It was just a lot warmer and easier to listen to...the .......

7: One vendor has this to say (8.90)
Posted by tonemaniac on 2003-10-09, 03:36:39 (68.167.71.66)
better than sliced bread ? "$54.00 per pair, Shipped! Analog Devices' new AD8066 has just made all other op-amps obsolete, and thereby provided Digital Playback with a new level of performance possibi .......

8: AD8066 opamp first impressions (8.86)
Posted by Dad on 2003-10-11, 14:02:39 (24.25.17.81)
Last week there was a post about a vendor on Audiogon proclaiming that the AD8066 opamp makes all other opamps obsolete. Well, I had to try this wonder opamp after hearing this! I have evaluated many .......

9: RE: OPA827 and OPA627 comparison (8.68)
Posted by Lou on 2008-01-08, 14:42:38 (71.72.200.172)
If you like the warmer sound of the BB's you can get a nice tube like sound from AD797's. For still better sound, and unlike most AD stuff you have the AD8066, perhaps the most perfect sounding opamp .......

10: AD8066, AD8620 or other op-amps? (8.59)
Posted by F.L on 2004-12-01, 10:40:19 (219.78.253.251)
I have a Denon 2900, and there are Op275 on the audio board. I would like to use a better op-amp. If the LC Audio AD8065 is good, how about the dual AD8066 and the AD8620? I know OPA2604 is reliable, .......

11: CD upgrade - op-amps replacing (8.56)
Posted by Alex on 2004-02-05, 01:32:23 (195.117.33.7)
Hello, Sorry for my english , I'm from Poland. I have Marantz CD6000 (not KI not OSE) and PM7000 amplifier. I'm wondering about replacing NJE2114 in CD.I found infos that LcAudio changed AD825 to AD80 .......

12: Even more mods to the Denon 2900 (8.14)
Posted by mrdon on 2006-01-23, 05:16:17 (71.242.236.25)
Over the weekend, I replaced every electrolytic cap in the power supply with Panasonic FC's, increasing the capacitance by 20% over stock except the large cap after the diodes which I increased by 100 .......

13: Re: AD8066 power supply voltage problems (7.84)
Posted by alley-kat on 2004-10-11, 21:55:17 (172.148.76.157)
hi marc, i tried running the ad8066's in a cdp at+/- 12v. with good decoupling and bypassing and they ran so hot, i couldn't hold my finger on them. i don't see how they could possibly have a verry l .......

14: Re: AD8066 problems. (7.82)
Posted by Kuei Yang Wang on 2003-12-07, 05:28:54 (82.35.157.35)
Konnichiwa, > My only guess would be the 15+/-voltage supply is > just to much for this op-amp. Well, the datasheet specifies an ABSOLUTE MAXIMUM (meaning if you exceed this once the chip will be dama .......

15: AD8066 Revisited... (7.79)
Posted by Dad on 2004-01-26, 16:15:45 (24.25.18.58)
Ok... so in the past I thought the sound of the AD8066 was a bit amusical compared to the OPA627 and LM6172 (with NP0 bypasses) but being snowed in here in North Carolina I got bored and started playi .......

16: Analog Devices AD8066 op amp (7.74)
Posted by tonemaniac on 2003-10-08, 05:05:36 (68.167.69.207)
what's with this one ? A guy on audiogon is claiming that they are the great breakthough... Analog Devices only says: "High Performance High-Speed FastFET™ Op Amp The AD8065/66 amps are voltage feedba .......

17: AD8066 problems. (7.25)
Posted by gads on 2003-12-07, 04:31:16 (212.199.130.130)
Two pairs of AD8066 I installed, I thought the first got damaged during labor, but when the 2nd pair distorted like hell I knew something was wrong. After my player was fitted with almost every dual o .......

18: Re: I have two but I need four! (7.20)
Posted by highendman on 2003-10-20, 14:28:13 (67.21.91.65)
Well you need 2 AD8066 or 4 AD8065s (for a DAC that uses dual opamps). .......

19: I'm running the AD8066 at 15V +/- with no problems. nt (6.86)
Posted by Dad on 2003-10-27, 15:36:02 (24.25.17.81)
.......

20: Re: AD8066 Revisited... (6.86)
Posted by highendman on 2004-01-27, 15:48:14 (67.21.91.65)
Thanks for the update Dad. You're getting great slam out of them now? .......

21: AD8066. It's a surface mount type with a max of +/- 12v. nt (6.80)
Posted by Dad on 2003-11-02, 14:58:51 (24.25.17.81)
.......

22: Re: Max Voltage for AD8065 (6.73)
Posted by smuttner on 2004-03-18, 23:18:04 (24.66.94.140)
Thanks for the quick reply. Which op-amps do you prefer over the AD8066? .......

23: How Long Did You Break In The AD8066? nt. (6.60)
Posted by Cougar on 2003-10-11, 18:01:37 (198.81.26.9)
nt. .......

24: Anyone else tried the AD8066+Kemet NPO V rails bypass combo? Dad, feel free to update,nt. (6.55)
Posted by gads on 2004-02-11, 04:59:31 (212.199.130.130)
.......

25: Re: AD8066, AD8620 or other op-amps? (6.47)
Posted by gstew on 2004-12-01, 16:49:54 (199.86.30.32)
What about in a tuner with just a 12v+ rail? What would you recommend there? TIA! Greg in Minneapolis .......

26: Re: AD8066 power supply voltage problems (6.47)
Posted by araman on 2004-10-11, 15:36:29 (81.57.96.19)
hi i'm testing the THS4062 it seems promising the AD826 needs some hours of burnin alain .......

27: Re: BA4560 opamp question (6.41)
Posted by Bom on 2003-11-06, 09:05:59 (161.200.255.163)
thanks Dad, Do you mean I can't swap BS4560 with AD826? I personally like AD product. I recentl;y tried AD8066 in my CPS and I like it so much. thanks .......

28: Re: AD8066 power supply voltage problems (6.35)
Posted by EchoWars on 2004-10-11, 18:57:47 (65.28.50.110)
The BB OP637 isn't an option unless you want to use two adapters. I'd suggest you take a look at the OPA2604, or the OPA2132. .......

29: Re: Absolutely!... (6.35)
Posted by gads on 2004-01-29, 02:53:58 (212.199.130.130)
Thanks. One thing I also noticed with the LM6172, is that it needs to be gain adjusted (smaller resistor), otherwise the output level is much lower than optimum. Is that the case with the AD8066? ::: .......

30: Re: Op-amps voltage supply change question. (6.30)
Posted by ramw on 2004-02-11, 03:29:08 (82.80.12.25)
I'm actually trying to power the AD8066, I thought swapping as you suggested might work, but did'nt want to go blindly on that. .......

31: OpAmp tweak for 67SE (6.30)
Posted by JoA on 2004-03-11, 02:20:56 (203.177.0.176)
Any thoughts on what would be a better upgrade for this cdp's NJM2114 chip - would it be OPA2604, AD8620 or Ad8066? (am trying to stay away from single amps) .......

32: Re: AD8066 opamp first impressions (6.30)
Posted by fmak on 2003-10-12, 12:26:28 (195.92.67.67)
One issue after reading the data sheet. The 8066 doesn't seem to like riving capacitance (20pF only). The 627 isn't brilliant either. .......

33: Re: BA4560 opamp question (6.24)
Posted by Dad on 2003-11-06, 09:49:10 (64.132.174.20)
You would need to measure the rail voltage going to the BA4560s. If it's +/-15v or less, go ahead and install DIP sockets so that you can try a few different types. If it's +/-12v or less, try the AD8 .......

34: Is there a verdict on the AD8066?? (6.24)
Posted by Julien43 on 2003-11-22, 20:11:16 (68.154.202.95)
I have so much going on in my system right now, that I don't want to add another varaible. But I'm very curious, as I have a couple ready to drop in my DAC. TIA Julien Therrien jntherrien@msn.com ::: .......

35: If you're running +/-12v then I vote for the AD8620. (6.18)
Posted by Dad on 2004-12-01, 12:17:21 (64.132.174.20)
I have tried just about all of the popular opamps including the AD8066 when it was first introduced. The AD8620 is the most balanced of them all when used in an analog output stage. .......

36: Re: BA4560 opamp question (6.15)
Posted by gads on 2003-11-07, 02:02:33 (212.199.130.130)
Are you sure AD8066 is rated +/-12V ? The data sheets say it's 24V, and I don't think they mean it is the sum of the two rails, but each, otherwise all those cdp's supplying 15+/-V with the LC modules .......

37: Re: AD8066 power supply voltage problems (6.07)
Posted by legarem on 2004-10-12, 03:31:07 (64.18.171.182)
The 2604 isn't in the same league about sound quality. The stock op amps in this cd player were 2604. Marc .......

38: WHHHYY ?! (6.01)
Posted by gads on 2003-10-21, 07:47:58 (212.199.130.130)
One AD8066 costs 4.5$, Browndog adaptor 2$, couple of silvermicas-max 1$, total of 7.5$. Why in Gods name LCaudio charges 46$ a pop, when not even R&D was taken by their part, how much labor advertisi .......

39: Re: AD8066 problems. (5.97)
Posted by jhietbrink on 2003-12-07, 08:09:09 (12.209.231.80)
The LM6172 can operate on as little as 5 volts. People making DIY headphone amps report good audio performance at 7 volts and even a little less. And definitely use the NPO bypass caps. .......

40: Re: 8066... where is pin 1??? (5.96)
Posted by Dad on 2003-10-27, 11:24:52 (24.25.17.81)
If you hold the opamp so that you read 'AD8066' left to right (just like reading a book), pin 1 is the lower (bottom) left pin! .......

41: Re: Only about 2 hours. nt (5.92)
Posted by Cougar on 2003-10-12, 07:33:24 (198.81.26.9)
I wonder how the AD8066 would sound after 50 hours, I put some OPA2134 in a preamp and it took them about 30 to start sounding better also with LT1115 they took about 60 hours to sound their best. Ste .......

42: Re: about AD826 (5.82)
Posted by Glenn2 on 2004-03-12, 03:53:42 (194.128.223.34)
I can confirm that this chip works well in the CD-67SE. The AD825 modules (I made my own using Brown Dog adaptors) also work well and are slightly more musical. The AD826 is a bit brighter so it may j .......

43: Re: CD upgrade - op-amps replacing (5.77)
Posted by Renu on 2004-02-05, 22:11:59 (203.177.0.176)
glad you mentioned about single vs dual coz i got same problem with AD825 for NJM2114. what exactly are those adapters? can these be DIY'd too? Is AD8066 dual and can be direct plugin replacement for .......

44: Re: Your not alone!!! (5.69)
Posted by randallt on 2003-11-06, 18:48:15 (12.217.240.213)
Julien, please report back what you think of the AD8066's. Like you, I'm using the LT1364's in an MSB Link (w/Morgue mods) and think it sounds great. Transport is a Bartha-modded Pioneer DV525, cable .......

45: Re: CD upgrade - op-amps replacing (5.61)
Posted by Dad on 2004-02-06, 03:28:58 (24.25.18.58)
Here is a link to the adapters from BrownDog. Although you can use the AD8066 without bypass caps, it doesn't sound nearly as good as with the caps in place. .......

46: Yes, you can... (5.54)
Posted by Karlosak on 2005-08-04, 04:01:02 (82.208.33.254)
Two BB's OPA627 on dual brown dog adaptor is the "safest" (and sonically one of the best) direct replacement for OPA2604. It has similar sonic signature yet with much greater refinement. The mentioned .......

47: which size code KEMET .1 ceramic fits the ad8066? (5.53)
Posted by alley-kat on 2004-09-01, 12:29:10 (172.137.236.43)
hi, i've just installed ad8o66 op amps in my cdp and, was wondering which size code, i need to fit between pins 4 and 8 properly. thanks in advance, alley-kat .......

48: Re: Anyone compared the AD8066 with the OPA2604? (5.49)
Posted by Aussie Geoff on 2004-04-05, 16:27:31 (218.214.15.211)
Dave, Thanks for the prompt and informative follow up. Yes it is Soundlabs I was working with. I'll have to have a look at the boards inside my processor - but from the one I have looked at they were .......

49: How to solder opamp SOIC? (5.39)
Posted by Bom on 2003-10-29, 08:56:02 (161.200.255.162)
I just received the AD8066 sample. How do you desolder the existing SOIC opamps and solder with this new one? Any special tool for that? I heard that the cellphone technician has special tool for fixi .......

50: Adapters for the AD8066 opamp (5.37)
Posted by Julien43 on 2003-10-11, 22:38:58 (24.136.152.47)
A while back I was trying different opamps in the output of my MSB DAC. I also obtained some samples fron AD, and I'm hoping to find an adapter that would allow me to try a pair of these duals for the .......

51: The AD8066 IS much better than the 6172 with the same caps.... (5.33)
Posted by Dad on 2004-03-31, 09:24:10 (64.132.174.20)
not as cold sounding BUT my 8066's have developed (or induced) a low level hum in the output that is driving me crazy. Too bad, it's the best sounding opamp (but only with the Kemets) by far IMO. I am .......

52: Re: AD8066 problems. (5.31)
Posted by TimWalpole on 2003-12-07, 13:23:07 (81.96.75.137)
Im assuming the lcaudio boards must have some way of reducing the voltage on board, or supply them according what voltage is reqd as with clocks for cd players. I looked at these and obviously my onl .......

53: Re: Is there a verdict on the AD8066?? (5.27)
Posted by Dad on 2003-11-23, 04:25:39 (24.25.17.81)
My verdict is that they are very good but lack some excitment overall compared to some other top opamps. Technically (specs), the AD8065/66 are probably the best (except for voltage ratings) opamps go .......

54: RE: Problems with LM4562 Opamp in Tjoeb '99 cd-player (5.25)
Posted by John PA on 2007-09-29, 08:59:55 (70.134.127.109)
If it works or not I find that the 4562 in a spot that truly influences the sound, is somewhat artificial and HiFi sounding. There are other options that would be more natural like the AD8656 or the A .......

55: Re: AD 8066 oscillation problem. (5.16)
Posted by amuron on 2003-12-04, 21:08:34 (64.211.116.123)
A socket will not allow the AD8066 to come anywhere near its advertised specs. As far as bypass caps, they need to be within 0.1" of the input lead, and with a socket in place, that you've already use .......

56: Re: This link tells all... (5.10)
Posted by Dad on 2003-11-07, 09:58:21 (64.132.174.20)
The funny thing is that I'm running the AD8066s in both my SACD player's analog stage and in my preamp. In the preamp, they are running at +/-15v just fine (it has been powered on continuously for wee .......

57: Re: AD8066 power supply voltage problems (5.00)
Posted by EchoWars on 2004-10-12, 03:54:45 (65.28.50.110)
Didn't know the 2604 was stock. I think it is a fine sounding opamp. Seems you are shopping for specs more than shopping with your ears. All the 'high end' AD opamps max out at +/-13V or less. I've li .......

58: opa 627! (4.93)
Posted by Vynuhl.Addict on 2005-12-12, 23:36:07 (154.20.35.201)
gets my vote, i have tried the ad8620,ad826,opa2134,opa2604, ad823, ad8066, ad825's, op249 and by far the opa627 was the best on all fronts, detail, high, mids and lows, ambience, and an overall music .......

59: RE: Want to tweak a CD player where to start (4.93)
Posted by Lou S on 2008-01-29, 12:10:20 (71.72.203.185)
Hi Dave, I have never worked on Marantz gear. I tend to work on Sony gear a lot. Sony tends to have very sound designs, and their power supplies are pretty darned good out of the box. The most bang fo .......

60: Re: AD8066 power supply voltage problems (4.90)
Posted by legarem on 2004-10-12, 06:05:16 (64.18.171.182)
No I'm not shopping for specs. What I like is a warm sound with detail. First, I dislike op amps. I have to live with them. If the player wasn't on warranty, I would use resistors for I/v conversion .......

61: RE: Highly secretive new opamps made of the rarest Unobtainium (4.76)
Posted by Thorsten on 2010-07-19, 12:12:24 (221.216.252.94)
Hi, Did you read the datasheets? Looks to me like a 5532 and TL082 (or more precisely the JRC/NJR analogs) in drags, more or less. Now they MAY have some magical sound quality, but it would be the fir .......

62: AD8066 power supply voltage problems (4.54)
Posted by Legarem on 2004-10-11, 15:11:35 (64.18.172.36)
Hi I tried this op amp with adaptors in my Shanling CD T100 and the results are amazing. Later, I looked at this op amp specs and they specify no more than +13V and -13V. The shanling PS is +15 and -1 .......

63: Re: Thanks... (4.48)
Posted by Glenn2 on 2003-10-23, 03:48:08 (195.92.67.70)
The resistor changes I made still enabled the other op-amps to work. Some of the faster ones are also optimal with lower feedback resistors. The LM6171/LM6172 data sheet suggests 1k as optimal, and th .......

64: Re: Op-Amp Suggestions Anyone? (4.46)
Posted by krishu on 2004-03-04, 12:25:00 (141.30.149.55)
Hello, OPA2604 will be fair enough. even better would be AD8620 (sound a tad better than AD8066, i think) but you'll need soic-to-pdip adapter then. (2 Euros at www.schuro.de, but they do not sell int .......

65: RE: Opamp comparison.. (4.42)
Posted by pmkap on 2008-02-07, 08:58:13 (72.229.134.224)
Jeff, I've compared both directly, in a dac output stage, as well as a line level crossover. My recommendation would be the LM4562, now also known as the LME49720. Its a moderate slew and speed opamp .......

66: what factors increase the risk of op amp oscillation? (4.41)
Posted by dgs on 2004-03-16, 19:13:44 (211.26.80.111)
Hi guys.... I was just wondering what factors increase the risk of op amp oscillation.....is it a high slew rate? high bandwidth? a combination of both or something else? I have been playing with op a .......

67: Re: AD8066 problems. (4.36)
Posted by Panelhead on 2003-12-07, 06:48:16 (216.190.135.245)
I have a modified Sony 222ES sitting in the closet. The opamp has 7.2 volt rails. I replaced the stock JRC with 8620 andit was better. Then I tried the 2604 and liked it better. The 7.2 volt rails a .......

68: Re: CD upgrade - op-amps replacing (4.34)
Posted by Dad on 2004-02-05, 04:32:26 (64.132.174.20)
If you are after a smooth warm sound, go with the OPA2604 or AD8620. However, you will get more lifelife sonics with the AD825 or better yet, the AD8066. A word of warning however, the LCAudio AD8065 .......

69: Analogue Devices Corp--Impressive Svc (4.22)
Posted by Jon L on 2003-11-05, 10:06:18 (162.119.232.100)
I'm a bit surprised and impressed about Analogue Devices' customer service. I requested some sample AD8066 op-amps, and they are flying them in ASAP from Philippines! No questions asked. When I asked .......

70: This link tells all... (4.00)
Posted by Dad on 2003-11-07, 04:20:09 (64.132.174.20)
check out the column headers. The AD8066 falls under the +/-12v column. .......

71: Re: None, they fit DIP 8 type. gads (3.92)
Posted by alley-kat on 2004-09-02, 19:02:16 (172.161.68.89)
hi gads, i've come to find the ad8066 op amps must oscillate pretty bad in my cdp. they get so hot you can't hardly put your finger on them. i have .1uf stacked film between +/- voltage pins, have ad .......

72: LM6172 with Kemet .1uF NP0 multi-layer ceramic bypass caps between v- & v+ = Excellent! (3.89)
Posted by Dad on 2003-11-19, 15:43:00 (24.25.17.81)
Taking Jhietbrink's suggestion (see link) I ordered samples of these somewhat pricy caps and put them directly between pins 1 & 8 on the LM6172, slapped them into my SACD's analog output stage and was .......

73: Re: AD 8066 oscillation problem. (3.44)
Posted by amuron on 2003-12-05, 15:06:27 (64.211.116.123)
NPO for a bypass seems a little strange. They add a lot of expense for extreme temp operation and usually NPO does nothing for ESR and oscillation issues. However for critical time keeping they are th .......

74: RE: Opamp comparison.. (3.31)
Posted by Lou S on 2008-02-06, 10:45:44 (71.72.202.145)
Unfortunately I cannot really remember the LM4562, which would tend to indicate that it was a pretty run of the mill chip. Granted, my run of the mill may be another's great find, but then I have spen .......

75: Denon 2900 "Dutch Mod" (3.25)
Posted by mrdon on 2006-01-11, 05:30:05 (70.110.190.83)
I am naming this mod procedure the "Denon Dutch Mod" as I got the idea through this a Dutch modding website and through assistance from diyaudio forum member D.A.R.R.Y.L. who happens to live in Hollan .......

76: CD Player Mods (2.61)
Posted by Fin on 2003-12-11, 18:18:07 (202.83.86.174)
Hi all I am new to the asylum and to DIY. Over the last few weeks I have learned a lot from the questions and answers many of you have posted here. As a consequence, the bug has bitten and I am well o .......

Found total of 76 records, Query: AD8066 in Tweakers' Asylum, Time: 0 sec.

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