Question about Peavey Max 115 1x15 Bass Combo Amplifier, 60 Watts

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Serial number 00-06778552, a gig amp manufactured about 1977/78, (used in an American tour in 1978). While running a practice session at low volume, the yellow DDT light blanked altogether (this has been on for periods, then off for periods without any change to settings), and the sound died, other than a hum which got louder. The amp was switched off, and the guitar disconnected, then the input gain turned to zero, and switched on again. A hum was clearly heard through the speaker, getting louder, so the amp was turned off again, with a very loud thump noise. Is this a short, or had the DDT circuit gone altogether, and are parts available because of age.

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The amp has a failure. One side of the power amp is starting to draw excessive current to the point that the filter caps can't sustain the current so the ripple starts to be heard in the speaker. Continued use MAY burn up the speaker by sending DC through it as well as causing additional damage to circuit boards, etc..

Posted on May 26, 2011


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