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Re: Cary 300 SEI with HUM in Noise Floor

It is not ground loop type hum - no CATV anywhere in sight. It is an "audible buzzing" sound in the noise floor which is always there (either usig headphones or monitors). I've adjusted bias - no luck. So, if not tubes, bias, or transformer - then may be as you say. How do I measure for hum voltage across output terminals? I would have thought Cary could have done this while the amp was with them - they simply deny it's a problem = very frustrating!


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