Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

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Thanks, Michael, can I ask another question about

Posted by gkargreen on January 4, 2017 at 14:12:02:
this Scott 340A? I rebuilt the power supply, replaced caps, etc., but I have a 120 buzz on the output that measures around 1.2 v on the plates & screen, not much voltage on the speaker outputs, but definitely audible. In the past I have found this buzz, which does not vary with volume, to be related to the heater voltage, most of these amps do not have a center-tap ground and the 340A it is the same, from what I am tracing it is grounded to the chassis at one end of the heater string, in this case, the end of the string is at the last light bulb, which is grounded to the chassis. I was wondering about constructing a center tap by placing two 220 ohm resistors on each side of the filament and then grounding the other two ends to the chassis, similar to what is done on standalone amps where the heater string is sent out to power an outside preamp, such as Eico's, Heathkits, etc. Do you have any suggestions? Thanks, Randy