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Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all products

    SQA-80 Loss of one Channel


    Posts : 1
    Join date : 2014-05-23

    SQA-80 Loss of one Channel Empty SQA-80 Loss of one Channel

    Post by Reilly on Fri Jun 13, 2014 9:19 pm

    So someone hands you an amp that wont work on one channel. I've heard the C-9 C11 caps are notoriiously suspicious in the loss off one side I am getting a schem. now but for Friday nights any thoughts
    Bob Latino
    Bob Latino

    Posts : 2794
    Join date : 2008-11-26
    Location : Massachusetts

    SQA-80 Loss of one Channel Empty Re: SQA-80 Loss of one Channel

    Post by Bob Latino on Sat Jun 14, 2014 6:58 am

    Hi Michael,

    You do know that the Dynaco SCA-80Q is a SOLID STATE amp and this is the Dynaco TUBE Audio Forum ? We don't really deal with any of the Dynaco solid state amps on this forum - BUT - C9-C11 are part of the main power supply for this amp. If one one of those caps were to be bad then it would affect BOTH channels. On that amp there is a PC-17 board and a PC-18 board for EACH channel. More than likely one part on one of the boards has gone down. The early Dynaco solid state gear was (unfortunately) not very reliable and the "loss of one channel" is THE most common problem found on the early Dynaco SS gear.

    Although neither Roy Mottram or myself deal with Dynaco SS gear, you may want to try this web site > Update My Dynaco web site. They sell parts for Dynaco solid state gear. They may be able to help you. We do have a complete assembly manual on file for the SCA-80Q at the link below ..

    Dynaco SCA-80Q assembly manual


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