In Reply to: noise posted by mfitz on May 8, 2021 at 09:05:44:
I did a search and the OP first posted about the amp when he joined AA six years ago:
https://www.audioasylum.com/cgi/t.mpl?f=tubediy&m=239098
Reverend Lo Mu thought it was an April Fool's Day prank!
Then, about 2 weeks later, the OP posted again saying he had solved the problem and the amp was now "quite as a mouse".
https://www.audioasylum.com/cgi/t.mpl?f=tubediy&m=239447
Then, in 2019, he built a Bartola 01A preamp and started a thread in which he complained about high frequency noise and asked about grid stoppers.
https://www.audioasylum.com/cgi/t.mpl?f=tubediy&m=267041
There was no indication that he solved the problem but it didn't seem to bother him much. Has the noise increased over the past 2 years or is he just bothered by it more?
Hopefully, he'll reply to the suggestions in this thread and clarify. Maybe not, though, since he's only posted 16 times in 6 years.
Since he claimed earlier that he was able to get the amp to operate quietly, I'm guessing that his problem is really more about noise from the 01As and possible issues with the preamp. The fact that the amp was built using some of Rev. Lo Mu's ideas is a red herring and, predictably, has gotten everyone's panties in a bunch.
Question for the OP, @mfitz : how sensitive are your speakers? From your listening position, do you hear noise with music playing or only between songs? Or, do you only hear it with no music and your ear right up to the speaker?
Are the 01As globes or ST shape? Some individual tubes are noisier than others and you may be asking too much if you expect total silence with your ear up to a high efficiency speaker.
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Follow Ups
- Interesting . . . and Confusing - Some History - FlaCharlie 05/10/2106:30:14 05/10/21 (14)
- RE: Interesting . . . and Confusing - Some History - 91derlust 15:31:54 05/10/21 (0)
- RE: Interesting . . . and Confusing - Some History - deathtube 667 09:11:13 05/10/21 (11)
- RE: Interesting . . . and Confusing - Some History - rivervalley817 18:36:24 05/10/21 (9)
- RE: MLP copycats ... - deathtube 667 09:41:34 05/11/21 (8)
- RE: MLP copycats ... - cpotl 12:03:09 05/11/21 (7)
- RE: comments by Herb Reichert on SS 2A3 - deathtube 667 03:18:05 05/12/21 (2)
- RE:someone appears to need direct intervention - awsjr 03:35:06 05/12/21 (1)
- RE:someone appears to need direct intervention - PakProtector 06:51:32 05/12/21 (0)
- RE: MLP copycats ... - rivervalley817 15:56:55 05/11/21 (3)
- RE: MLP copycats ... - PakProtector 16:13:33 05/11/21 (2)
- RE: MLP copycats ... - rivervalley817 17:53:11 05/11/21 (1)
- LMAO... - PakProtector 04:44:03 05/12/21 (0)
- RE: Interesting . . . and Confusing - Some History - PakProtector 17:49:20 05/10/21 (0)
- Yes, I noticed this as well..... nt - Cut-Throat 08:52:59 05/10/21 (0)