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KB-300 overheats

Posted: Sat Mar 14, 2020 6:01 pm
by Paul Perkins
My KB-300 just started acting up, very low volume, seems like no volume unless turning up the reverb knobs, then after a short time of attempting to play my keyboard through it, it overheats and shuts down. The back of the panel gets really hot, and I pulled the amp out to look for anything obvious, nothing visably wrong, but some discoloration of metal where the 4 metal devices are mounted, and seems like maybe heat radiating more from one of those 4 more than the others. Appreciate any help. I know how to use an ohm meter and a soldering gun, but otherwise electronically illiterate.

Re: KB-300 overheats

Posted: Thu Apr 02, 2020 5:30 pm
by Enzo
Check the speaker, is it bound up?

Overheating usually means trouble in the output stages, could be simply bias related but could be other issues.

I really suggest taking it to a competent amp tech.