Resurrecting a dead amplifier

Today I took a look at the damage caused by last weekend’s test of the matrix switcher prototype. I suspect that the cause of the bangs was actually a short because in my haste to test I’d only connected one channel to a speaker and left the other with bare ends - oops!



Removing the case revealed that the damage appears to be limited to two transistors on one of the channels. I’m not the only person who’s tried to fix this model of amplifier so a quick search for the numbers written on the remaining transistors revealed the information I needed to order some replacements. The parts have been ordered, so will hopefully arrive before Christmas, although delivery times recently seem really slow.

Now I just need to remember where I left my soldering iron…