First check your power transformer with rectifier tube removed. If it doesn't get hot may still be good?
Does your schematic call out plate voltage on the rectifier? DC voltage out of the rectifier? Usually loaded DC voltage out of a rectifier is close to AC input to plates. Don't go by unloaded voltage. It will be around 1.414 times AC input.
If a voltage is identified as 285 out of a transformer it's AC. DC is only measured after the rectifier tube.
You need more than 235 volts found on the audio tube. Some will be lost through filtering. Not seeing the schematic, 285 mentioned is probably about right.
Norm
:I have a northern electric model 841-A with a burned power transfo. The only voltage indicated in the diagram is +213V on the plate of the audio power amplifier tube. A note elsewhere on the diagram says: input 285V at 115V line. Is it 285Volt A.C or D.C? I noticed on another radio that the transfo was 330V A.C and the D.C output raised to 460V D.C without charge. This voltage dropped at about 340V when I reconnected the B+. Can anyone help me to determine the original A.C output voltage of this transfo? Thanks
:Danny
Contact Hammond mfg, they will probably tell you to unwind each winding and count the turns, atleast they did for me, when you are done you will have enough wire to start a scrap metal yard, call them first, and if they get you to unwind it, wear gloves, i learned the hard way. Hope this helps, Robert Howie
Bill VA
:Contact Hammond mfg, they will probably tell you to unwind each winding and count the turns, atleast they did for me, when you are done you will have enough wire to start a scrap metal yard, call them first, and if they get you to unwind it, wear gloves, i learned the hard way. Hope this helps, Robert Howie