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

RE: hum is a non-issue.

My OTLs are basically Atma-sphere amplifiers with a lot of tweaks. I put them together as kits back in the late 90s, with the help of a knowledgable friend. I then decided to educate myself about tube electronics so I could understand this and some other circuits better than zero understanding. As I recall, the first iteration of the amplifier did have a very minor issue with "noise", but it was never true "hum", in the sense of 60Hz or 120Hz noise. Later iterations have consistently been dead silent, as in I don't know sometimes whether the amps are turned on or not, if there is no program material. You may fairly argue that I am using relatively inefficient ESLs, but lately I have been able to enhance greatly the efficiency of the ESLs. Still dead silent. Over 35 years, I have also owned several Futterman-type amplifiers; I never heard any hum from any of those, either.


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  • RE: hum is a non-issue. - Lew 08:13:53 07/25/12 (0)

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