Home Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

Interesting . . . and Confusing - Some History

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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