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This fits bw's suggestion to check the amp.
brian whatcott wrote:
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Sometimes you can replace the line output transistor and it will hold up.
The line output transistor is never overspecified. But it is not
expensive to try a replacement. I seem to remember a down home recipe for
diagnosing a failed output transistor of this kind: the forward resistance
collector-emitter resistance should be greater than 100 Ohms (if I remember
rightly).
Sometimes it fails again. Then David's line output transformer
suggestion will need your consideration.