Re: 90% of hum gone but why???

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In Reply to: 90% of hum gone but why??? posted by breadhead on April 15, 2007 at 15:32:43:

Jim
I think you partially ansewered your own question..Typically on a conventional tube amp like a mac mc60 they installed a hum pot in the filamemt circuit going to the heater of all the tubes..It makes no difference where you set the pot as long as you dont have any heater to cathode leakage.It sounds as tho you may have a bad tube that you unaware of and even if its new,they can still have leakage.Try a tube and if it takes the other 10% hum away,you have solved the problem.

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Topic - 90% of hum gone but why??? - breadhead 15:32:43 04/15/07 (4)

Was there any ground connection on the filaments ... - Triode_Kingdom 08:07:58 04/16/07 (2)

Re: Was there any ground connection on the filaments ... - breadhead 11:46:58 04/16/07 (0)

And didn't you say it hummed even without the output tubes? - Triode_Kingdom 08:15:00 04/16/07 (0)

Re: 90% of hum gone but why??? - Michael Samra 23:38:40 04/15/07 (0)

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Re: 90% of hum gone but why??? - Michael Samra 23:38:40 04/15/07 (0)

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