03-12-2015, 03:44 PM
The electrolytic from Vintage Electronics arrived today. (Man, that was fast service! )
Here's a photo after I had cut it open for restuffing:
[Image: http://www.philcoradio.com/images/phorum...5T_025.jpg]
That can was restuffed and installed, final loose ends taken care of, and it now looks like this underneath:
[Image: http://www.philcoradio.com/images/phorum...5T_026.jpg]
It looks much neater under the chassis with the restuffed can electrolytics instead of the sloppily installed electrolytics that were under the chassis.
So, I tried it out with the 84 rectifier unplugged. A wise decision, as it turned out - as soon as I turned the thing on, I noticed the magic smoke coming out. Another quick look indicated the smoke was coming from between the two plate terminals of the 84 tube socket, and a blister had appeared in the wafer between the two plate pins on the underside of the socket.
Obviously, something caused a carbon track to be burned between the rectifier plates.
So I'll have to replace that socket. I shall do so, and try it again.
Just for fun, I ran a brief test after disconnecting all five wires from that socket. No more smoke was evident, and the AC voltage from plate to plate measured 665 volts AC. The service data does not give the AC voltage between the rectifier plates, but the schematic indicates 330 volts DC from B+ to B- across the input electrolytic capacitor (42). So, 665 volts AC across the rectifier plates sounds like a reasonable figure and there should not be any more issues once the rectifier socket is replaced. (I hope.)
Here's a photo after I had cut it open for restuffing:
[Image: http://www.philcoradio.com/images/phorum...5T_025.jpg]
That can was restuffed and installed, final loose ends taken care of, and it now looks like this underneath:
[Image: http://www.philcoradio.com/images/phorum...5T_026.jpg]
It looks much neater under the chassis with the restuffed can electrolytics instead of the sloppily installed electrolytics that were under the chassis.
So, I tried it out with the 84 rectifier unplugged. A wise decision, as it turned out - as soon as I turned the thing on, I noticed the magic smoke coming out. Another quick look indicated the smoke was coming from between the two plate terminals of the 84 tube socket, and a blister had appeared in the wafer between the two plate pins on the underside of the socket.
Obviously, something caused a carbon track to be burned between the rectifier plates.
So I'll have to replace that socket. I shall do so, and try it again.
Just for fun, I ran a brief test after disconnecting all five wires from that socket. No more smoke was evident, and the AC voltage from plate to plate measured 665 volts AC. The service data does not give the AC voltage between the rectifier plates, but the schematic indicates 330 volts DC from B+ to B- across the input electrolytic capacitor (42). So, 665 volts AC across the rectifier plates sounds like a reasonable figure and there should not be any more issues once the rectifier socket is replaced. (I hope.)
--
Ron Ramirez
Ferdinand IN