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1: Tube DIY Asylum, RE: noise (0.00)
Posted by mfitz on 2021-05-18, 12:58:12 (24.127.222.126)
Didn't mean to cause a shit storm guys. So I added 12uf cap to the 2nd stage of the power supply in the power amp and this reduced hum to a point that I can't hear any at the listening seat. The stati .......
2: Tube DIY Asylum, RE: he was... (0.00)
Posted by mfitz on 2021-05-11, 12:32:09 (24.127.222.126)
pacprotector, Would love to have a mentor on these things. Using dc on everything in the pre, copied from bartola valves. The power amp has ac on the filaments.I later added hum pots. This helps but .......
3: Tube DIY Asylum, noise (0.00)
Posted by mfitz on 2021-05-08, 09:05:44 (24.127.222.126)
Hi Folks, This is a call for help. Are there any experienced DIY guys that could help me with noise issues in my Pre and Amp builds. I have a SE 2A3 amp using DR low mu design and a pre using 01a tube .......
4: Vinyl Asylum, RE: used carts (0.00)
Posted by mfitz on 2019-04-03, 20:59:45 (24.127.222.126)
Here is my system. Back loaded horns with mark audio drivers and HIVI planer tweeters. DIY SET 2a3 power amp DR Low Mu design, And just recently a Bartola 01a preamp that just puts my system where I h .......
5: Vinyl Asylum, used carts (0.00)
Posted by mfitz on 2019-04-02, 22:13:48 (24.127.222.126)
Any stories on buying used cartridges? MIke .......
6: Vinyl Asylum, carts (0.00)
Posted by mfitz on 2019-03-29, 22:00:29 (24.127.222.126)
Looking for recommendations of great cartridges under $500. I have a medium mass arm and can go with a mm or a mc. Carts I've owed in the past AT mc, grado wood body, Denon 110 goldring sonus blue. Th .......
7: Tube DIY Asylum, RE: grid stoppers (0.00)
Posted by mfitz on 2019-03-26, 12:08:34 (24.127.222.126)
Thought I would post an update. I have changed to real carbon comp resistors on the grid and plate of the tube, helped some. Tried a ferrit bead on the plate and it did not rid the noise, also made th .......
8: Tube DIY Asylum, RE: grid stoppers (0.00)
Posted by mfitz on 2019-03-12, 21:36:18 (24.127.222.126)
Thanks for every ones input. I have some new things to try. Mike .......
9: Tube DIY Asylum, RE: grid stoppers (0.00)
Posted by mfitz on 2019-03-07, 19:48:29 (24.127.222.126)
I have the volume control on the grid. Would not have thought the gyrator would be the culprit as this is the Bartola board. I have to look thru my resistor stash and see if I have some Allen Bradleys .......
10: Tube DIY Asylum, RE: grid stoppers (0.00)
Posted by mfitz on 2019-03-06, 19:01:55 (24.127.222.126)
Bought them years ago to try them out. I think they were carbon comp. Mike .......
11: Tube DIY Asylum, RE: grid stoppers (0.00)
Posted by mfitz on 2019-03-06, 17:22:11 (24.127.222.126)
Have not shorted the grid to hear, have not measured the grid to ground. Using the Rod Coleman regulator boards on the filaments. So DC on the filaments. Been listening to jazz all day, this think is .......
12: Tube DIY Asylum, grid stoppers (0.00)
Posted by mfitz on 2019-03-06, 14:03:02 (24.127.222.126)
Recently built Bartola 01a preamp. Had some high frequency noise after trying several tubes. Then installed Riken carbon com 6.5k in the grid stopper position. Noise much improved but still there a li .......
13: Tube DIY Asylum, RE: hum and ground (0.00)
Posted by mfitz on 2015-04-16, 20:32:05 (67.177.130.58)
Been listening all night. WOW. Better separation deeper bass, low level info galore, huge stereo image. This is the amp I knew it could. Now I can move on to other things. .......
14: Tube DIY Asylum, hum and ground (0.00)
Posted by mfitz on 2015-04-16, 17:14:17 (67.177.130.58)
Built a dc 2a3 amp a few years ago and was never satisfied with the hum level. Good sound otherwise. Started a mad search in the forum for any clues to the problem. Found some good grounding tutorials .......
15: Tweakers' Asylum, diy speaker cable for set single driver (0.00)
Posted by mfitz on 2015-04-11, 23:02:51 (67.177.130.58)
Just wanted to pass my experience on to others. Been thinking about building new speaker cables out of silver but skin effect of thick wire worried me. I had a stash of vampire occ magnet wire differe .......
16: Inmate Systems, mfitz's Leap Of Faith (0.00)
Posted by mfitz on 2015-04-11, 22:28:27 (67.177.130.58)
mfitz 's Leap Of Faith System
IP Address: 67.177.130.58
Last Update: April 11, 2015 at 22:28:27
Amplifier: Diy dc 2a3. Dr LoMu design power amp. Love the simplicity. Great sound.
Preamp .......
17: Tube DIY Asylum, RE: help (0.00)
Posted by mfitz on 2015-04-01, 22:12:52 (67.177.130.58)
NOT sure if its 60 or 120. I think its 60. Yes I have hum pots. Thanks. .......
18: Tube DIY Asylum, help (0.00)
Posted by mfitz on 2015-04-01, 21:11:15 (67.177.130.58)
Im on my third amp build. This is a set 2a3 amp. Im having a devil of a time getting hum down to a acceptable level. Im using a Drlomu design which I like very much. Im wondering if the trainies and c .......
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