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Carlsbro Keyboard 150 , 15 inch combo from 1985

Discussion in 'Electronic Repair' started by N_Cook, Mar 7, 2013.

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  1. N_Cook

    N_Cook Guest

    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
     
  2. N_Cook

    N_Cook Guest

    I should know the identity of the TO3 tomorrow , both NPN on rechecking.
    Loose Collector bolts so I have to get to the other side to tighten. Not
    rivets , looked superficially like aluminium rivets . On Googling ,maybe cct
    similar to this admirable effort at unravelling to a schematic, the Stingray
    amp

    http://ax84.com/bbs/dm.php?thread=467875
     
  3. N_Cook

    N_Cook Guest

    Even more like the Stingray. 2x MJ802 , 1 BC182 and 3xBC557 instead of 3x
    bc212.
    Soft blown (not blacjened) ps fuses and mains fuse , then abandoned for 10
    years, no recollection of original failure scenario and nothing found, cold
    so far , a likely culprit
     
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