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Originally Posted by holmesuser01
Any chance the diode is installed backwards?
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That was one of my first thoughts. But according to Chad's post, it is in the correct way.
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Originally Posted by Chad Hauris
The schematic shows the multiple diode junctions of the selenium...a modern diode is just one junction with a single arrow. The "band" of the rectifier is where the positive DC comes out and this connects to the filter caps. The other end is the anode which connects to the AC input.
If all caps are new I would check and make sure they are connected right, especially the negative sides of the caps.
If the buzz is loud with the volume all the way down it is likely a power supply problem or less likely, heater to cathode leakage in a tube. If the buzz can be eliminated with turning down the volume the problem is elsewhere.
Caution as the power line connects directly to the chassis.
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The new electrolytic caps were oriented the right way they were just not properly grounded. Once I added a little solder to it (there was none before) 90% of the buzz was gone.
I think the next and hopefully last problem is that the G screw on the back cover is not connected to anything. If I put the phono/radio switch to the phono position the buzz is gone. Also there is zero FM reception. I am pretty sure I know where to make the connection from reading the schematic. I will let you know how it turns out. Thanks Nolan, holmesuser01 and Chad for your help. It's greatly appreciated.
