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jack jack is offline
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Default Sumo Polaris III Power Amp( Need Advice)

SNIP

If any of the output or driver stage semiconductors are
damaged, you may not be able to replace them as they have likely been
discontinued, assuming you could find a tech willing to service the amp!


The output semi's are not that difficult to replace -- they are TO-247
MOSFET's -- Gate, Drain, Source --2SJ115 can be substituted with a 2SJ200,
the 2SK405 can be substituted with the 2SK1529. Both are available from
ampslab dot com.

The circuit uses a servo to reduce DC on the output.