"ha1156w" wrote in message
oups.com...

There's a small epoxy part that
looks like a small round mauve blob with two leads and no ID
whatsoever. There's nothing silkscreened on the board at all and no
identifying marks on the companion part for the good channel. It goes
between the collectors of each half of the output transistors. This
mystery part on the bad channel turned to charcoal. Any ideas what the
heck this is?

Silicon diode. Use a IN4001 or similar.
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