I would list it for sale here, or on ebay as an auction with clear description of the issues and a "needs repair - as-is" buy. Someone will buy it happily, possibly at a surprising price.
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agree. Output stage blew. Known problem with these units.
Real SA20s are fixable with Exicons or Toshibas.
SA220s.... other things on the bias / protection board are likely toast and impossible to fix.
A lot of SA20s are actually SA220s.
Check to see if output devices are direct-wired or each set of 4 soldered to an output board.