Re: Mackie Thump TH-15A repair, no sound and OL LED always on, power supply, low qual

Hey folks I had the same issue with two of my Thump amps. Thanks for all the previous troubleshooting work. I appreciate the ideas. I supplied both of them with my bench supply and found they draw 60mA. This equates to about 900 mW of dissipation which is really too much for either transistor in a warm environment which these would be in. Instead I simply installed a 7815 linear regulator and mounted it to the chassis. I cut out all the old normal 15v supply parts and made my own.
Works...