(15-03-2014, 10:11 PM)richard296 Wrote: just so i get it right. the transistors 2n3055's have two terminals protuding from them with leads. and a third lead is attached to the fixing bolt. do i take a reading from both terminals of each transistor to the solder joint on the third wire. thank you richie
Initially I was suggesting just the collector measurements to get a rough idea as to what's what but while your at it and if you can you can measure the base and emitter voltages as well, here's a link to the connections:
http://fear-of-lightning.wonderhowto.com...y-0133210/
All measurements with respect to the common -ve power rail for the moment, also measure the individual voltages ACROSS the two small power resistors (the white ones that are close together) on the PA board.
Lawrence.
