Amp no longer producing sound

P

paulyc

Well-known member
You checked and/or swapped all the stuff I would have done, is the problem only when the amp is hot ? If so that sounds like a resistor opening up under thermal load. Get it to a tech, and good luck.
 
I don't know about the 667, but made for Canada Marshall amplifiers come fitted with a PT thermal switch. You have power, so... maybe there is something similar in other areas of the 667 circuit?

Lead-free solder is unforgiving, so it could be an intermittet conductivity issue. Resistors generally increase in resistance value.
 
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