• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Clairtone S-401 Tube Amp Restoration

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desolationx

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Joined 2010
mike567 said:
Your 60hz hum may not be an issue with the original speakers. an old trick was to drop freq response off below 70hz.. Good bye 60 hz hum!
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That's why I am not going to pursue fixing it. It must be a problem with the design/layout of the amp.



One thing I did notice is the hum changes when adjusting the volume. Starting with the volume at the lowest position, the hum decreases as the volume is increased, then it nulls at a minimum but then increases exponentially as the volume is increased to max. Must be coupled thru capacitance and/or inductance early in the signal chain somewhere.
 
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