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previous: MBSetzer That center-tapped heater winding i... -- 9/27/2000 1:46 PM View Thread

Re: Hum in a Kalamazoo

9/27/2000 2:20 PM
Re: Hum in a Kalamazoo
If you haven't replaced all the electrolytic capacitors, do that. If that is still not it, start swapping tubes. Also, if the plate currents on the 2 7591's aren't equal, the power supply hum will not be cancelled out in the output transformer. New electrolytics will help this, but balanced tubes also make a difference, I've found.  

Kent S. I had a hum problem that turned out... -- 9/27/2000 3:05 PM