The "blast" would have been pretty neat--except it was on my receiver!

I did not replace any of the semiconductors except the predrivers. They looked pretty badly scorched. I'm thinking now a diode might have failed into a dead short. Other than replacing the emitter resistors and TR209, what should I look at next? I'm going to re-measure the trim pot, but before I installed it I measured the old one (~65 ohms) and set the new one to match.

Jeff

Well, I suppose the transformer is good and strong then.

Replace all semiconductors on the board and on the cooling fin.
Check (or replace) all other components, even ceramic caps.
Do a continuity check on all PCB tracks.
If the board has serious dark spots from heat, it may have turned conductive and must be discarded.
When done, but before powering up, do some ohmic and semiconductor measurements
on strategic points to compare with the working channel.
Power up only using a variac with a current limiter and monitor the idle current from the moment power
is applied. If it runs astray pull the plug immediately.
As I told you initially in the first thread, this is not an easy thing to repair, there are no shortcuts.
The easiest and often cheapest method is to find a complete replacement module from
a donor machine, especially if you are not 100% into the soft clipping DC coupled complementary
output stages circuitry in this power range.
A full set of output transistors alone represents quite a cost and it usually doesn't stop there.

I've had some fireworks here too, you know.

Martin

I think the best thing to do is to replace the board. Do you have access to one, or know where to find one? My board is pretty darkened under the row of resistors. And, when I was replacing those resistors, several traces lifted on me, and I had to re-do the circuit connections.

Sadly, I don't have a board but I'm sure that there must quite a few BM8000's out there that
was given up for some reason, to donor a complete module.
I suggest you put an ad up in the wanted section.

Martin

Quick question, does the 8000 share output boards with the 6000?