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Old 08-15-2021, 05:10 PM
AudioFi AudioFi is offline
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Join Date: Aug 2020
Posts: 40
Default very interesting

Quote:
Originally Posted by cheater View Post
I am surprised McIntosh do not use DC power for the heater elements - that eliminates heater hum entirely. It's been done for over 50 years now. Might be an inexpensive fix for everyone with the hum issue. Send it to a guitar amplifier technician who knows how to rebuild tube amplifiers, and tell him to add a DC tube heater supply. It's a three hour job at most.
Is your MA252 dead quiet after this fix?. How does it work when using headphones?. I remember that the hum was even more noticeable when using HP.
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