Carlsbro Keyboard 150 , 15 inch combo from 1985
TO220 devices marked 40871 and 40872 and also SM are presumable RCA40871 /2
, anyone happen to know what the TO3 devices are , presumably NPN and PNP,
cold test seem ok. Usual Carlsbro, locked behind rivetted heatsink,
otherwise prea looks like HH Marlin type amps
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