Re: Atma-Sphere M60 MK2.III hum and noise question

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OTL, Output Transformerless Amplifier User Group.

In Reply to: Atma-Sphere M60 MK2.III hum and noise question posted by Tanker on July 22, 2006 at 05:00:41:

I'm a little unclear on this:
Without anything connect to the speaker except for the amp
Do you normally have something connected to the speaker, in addition to the amp? Or did you mean "Without anything connected to the amp, except for the speaker"?
It is normal for an Atma-Sphere amp to produce some hum/buzz with an open input - that is, with the cable from the preamp disconnected.
As for the high-frequency noise, that sounds like an otherwise unrelated tube issue. Try swapping around / substituting the 6SN7 driver tubes, and see if it has any effect. Obviously, shut the amp off before removing / installing any tubes.

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Follow Ups Full Thread

Topic - Atma-Sphere M60 MK2.III hum and noise question - Tanker 05:00:41 07/22/06 (1)

Re: Atma-Sphere M60 MK2.III hum and noise question - Legendre 08:11:17 07/23/06 (0)

Follow Ups

Re: Atma-Sphere M60 MK2.III hum and noise question - Legendre 08:11:17 07/23/06 (0)

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