View Single Post
  #7   Report Post  
Old January 15th 08, 02:23 PM posted to alt.binaries.pictures.radio
Ken Ken is offline
external usenet poster
 
First recorded activity by RadioBanter: Sep 2006
Posts: 68
Default Belmont 1050 chassis after extensive rebuilding

Brenda Ann wrote:
It's (almost) back to original circuitry now. The 50K resistor you see
hanging off the chassis is connected to the cathode of the 1st. audio amp.
It doesn't belong there, but the radio will not play properly without it.
With it, the cathode voltage sits around 30 volts. Without it, it sits
around 70 volts, and the resulting grid bias cuts the tube off so far that
there's more signal at the grid than at the plate.

Any suggestions??


Are you checking cathode E to ground? If so, it looks like R24 already
has 35V across it. Add the 50V from R18 to ground, you have 85V to
ground, not counting the E developed across R 15. The voltages given
look wrong, and they don't give a reading for the cathode. I would
select a cathode R to gnd that gave the correct current for good
operation. Ken