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You should be able to safely power up the amplifier with parts disconnected/removed.
It makes almost no sense to keep the output transistors connected if the amplifier board is removed though.
One or both of the output transistors have probably shorted out.
I'm very concerned that there is a significant change in current as the volume control is advanced. I am almost certain that you are seeing this with no input connected. The confounding detail is that none of the output transistors were getting warm, even though they appear die in spectacular fashion.
What is the rating of your bulb?
can you confirm that if you disconnect amplifier boards that even one channel operates properly?
I'm going to check where that resistor is now...
You should be able to safely power up the amplifier with parts disconnected/removed.
It makes almost no sense to keep the output transistors connected if the amplifier board is removed though.
One or both of the output transistors have probably shorted out.
I'm very concerned that there is a significant change in current as the volume control is advanced. I am almost certain that you are seeing this with no input connected. The confounding detail is that none of the output transistors were getting warm, even though they appear die in spectacular fashion.
What is the rating of your bulb?
can you confirm that if you disconnect amplifier boards that even one channel operates properly?
I'm going to check where that resistor is now...