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Millet Max Hybrid Problem

post #1 of 5
2/23/13 at 10:52am
Thread Starter 

Took the amp out of storage where it had been for a couple of years. 

 

Tubes seem to be okay, both glow and voltage is stable.

 

Right MOSFET channel measures 0 mV no matter what - turn the trimpot all the way clockwise, then 10-20 turns counterclockwise, nothing, although sometimes the mV will fluctuate between 200mV - 1V, but move the trimpot anymore and it goes ack to 0.

 

Left MOSFET channel is stable and can be adjusted by the trimpot. 

 

I switched the tubes to make sure it wasn't the tubes that was causing the problem.

 

Any ideas?

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post #2 of 5
2/23/13 at 11:39am
Quote:
Originally Posted by daggerlee View Post

Took the amp out of storage where it had been for a couple of years. 

 

Tubes seem to be okay, both glow and voltage is stable.

 

Right MOSFET channel measures 0 mV no matter what - turn the trimpot all the way clockwise, then 10-20 turns counterclockwise, nothing, although sometimes the mV will fluctuate between 200mV - 1V, but move the trimpot anymore and it goes ack to 0.

 

Left MOSFET channel is stable and can be adjusted by the trimpot. 

 

I switched the tubes to make sure it wasn't the tubes that was causing the problem.

 

Any ideas?

Could be the trimmer was hanging on by a thread and came loose from taking it out of storage.  Do the tubes bias OK?  Short of some pics and a thorough inspection, I'm just guessing. wink.gif

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post #3 of 5
2/23/13 at 12:52pm
Thread Starter 

Took it apart and reflowed the solder for the trimpot... seems okay now! Wow, thanks tomb :)

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post #4 of 5
2/23/13 at 2:38pm
Quote:
Originally Posted by daggerlee View Post

Took it apart and reflowed the solder for the trimpot... seems okay now! Wow, thanks tomb :)

That's great news!  Glad you got it fixed!

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post #5 of 5
2/25/13 at 8:56am
Thread Starter 

Now I have a new problem... there's a static hum/hiss in the left channel that's there and doesn't change with the pot. Amp sounds fine, music sounds fine... any idea? 

 

EDIT: think one of the tubes wasn't seated properly


Edited by daggerlee - 2/25/13 at 9:02am
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