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Clairtone S-401 Tube Amp Restoration
Clairtone S-401 Tube Amp Restoration
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Old 21st September 2018, 05:47 PM   #21
mike567 is offline mike567  United States
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Join Date: May 2011
Location: florida west coast
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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Old 21st September 2018, 06:21 PM   #22
desolationx is offline desolationx  Canada
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Quote:
Originally Posted by mike567 View Post
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!

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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