[Hallicrafters] SX-28A Issues

[Joe Connor]

How old are the filter caps? Could they be leaking? What you did with parallel caps would work if they were open but not if they were leaky or shorted. 

Joe Connor
On Tuesday, April 1, 2014 9:59 PM, Waldo Magnuson <magnuson at mac.com> wrote:
 
Hi,  My SX-28A was playing okay (after a long rest). Then the BCB station went away and the audio became a loud hum. I've tried: pulling the 1st audio amplifier (v12, 6SC7), hum remains, Substituted both 6V6GT audio output tubes - hum still present, paralleled C48 & C49 (power supply output caps) and C47 (cathode bypass for 6V6s) - no change, B+ measures maybe 150v (not schematic 250v).  Any suggestions welcome.
>Skip W7WGM
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