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please help identify mystery DIY mono amps on dynaco ST-120 chassis




i don't know anything about these. picked them up at a thrift store. best i can tell, these are modified ST-120 amps that are converted to mono...bridged somehow? someone did a very nice job, beautiful work. they sound wonderful, but i don't feel comfortable running them as there is noticeable ground hum through the speakers. any thoughts on what might be going on here? what are these things?


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Topic - please help identify mystery DIY mono amps on dynaco ST-120 chassis - Mr Blue Sky 19:30:06 01/03/21 (10)

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