what would cause a low buzzing electrical
noise, cannot get any other sound at all.

Hi,
What you are probably hearing is the arcing that is occuring through one of the filter capacitors.
The schematic is here:
http://ww3.nostalgiaair.org/schematics/RCA/_RCA_8-11.gif

I would start with a change-out of the filter caps, and if that does not remedy the problem, start with the .005uf cap across the output of the 42, and essentially work back through the stages from there.

If you do not have a capacitor tester, solder two wires to either end of a .05uf capacitor, and connect this cap in parallel with each cap until you find the one that makes it start to make noise, or work again. That would then be the cap to replace. The .05 is an aproximate value that should allow any of the caps to be tested for being open, but you should also check each cap to see if it is shorting out. A VTVM is or other high impedance meter is good for testing the caps for their resistance/leakage. Anything below about 3 to 5 meg should be considered a candidate for replacement if the radio does not function well.

: what would cause a low buzzing electrical
: noise, cannot get any other sound at all.

Hi,
Also check the the phono switch to make sure that you are getting a singal through it to the audio stages. It is possible that dirt or corrosion might make the radio innoperative also.

Also you chan check the funtionality of each stage by carefully touching the first grid and plate pins with a screwdriver. This will make each stage you touch amplify the electrical noise the shaft of the screwdriver picks up. The radio will buzz until you find the stage that is not functioning, or has a bad coupling cap.

: Hi,
: What you are probably hearing is the arcing that is occuring through one of the filter capacitors.
: The schematic is here:
: http://ww3.nostalgiaair.org/schematics/RCA/_RCA_8-11.gif

: I would start with a change-out of the filter caps, and if that does not remedy the problem, start with the .005uf cap across the output of the 42, and essentially work back through the stages from there.

: If you do not have a capacitor tester, solder two wires to either end of a .05uf capacitor, and connect this cap in parallel with each cap until you find the one that makes it start to make noise, or work again. That would then be the cap to replace. The .05 is an aproximate value that should allow any of the caps to be tested for being open, but you should also check each cap to see if it is shorting out. A VTVM is or other high impedance meter is good for testing the caps for their resistance/leakage. Anything below about 3 to 5 meg should be considered a candidate for replacement if the radio does not function well.

: : what would cause a low buzzing electrical
: : noise, cannot get any other sound at all.