I bought one radio RCA 54B3 in Ebay. I connected the batteries and was only some kind of noise but no stations. I checked and the capacitors were dry and the insulation in the wire were almost missing, I replaced allcapacitor and resistor and wires, the radio is very small and dificult to work, but now the radio is dead, no noise, I connect one audi signal from my oscillator to the grid of 3S4 and nothing, audio transformer is OK also the speaker.
Some ideas?
See the schematic in http://www.nostalgiaair.org/PagesByModel/983/M0014983.pdf
Thanks a lot

Hi Jordi

Measure voltages on your tubes. Tubes in your radio starting with "1" should have 1.5 volts between pins #1 and #7. Your 3S4 should have 1.5 volts between pin #1 and #5.

This radio uses a 67 1/2 volt B battery. Check plates & screen on each tube. They should be positive. The schematic shows voltages.

http://www.nostalgiaair.org/PagesByModel/983/M0014983.pdf

Norm

:I bought one radio RCA 54B3 in Ebay. I connected the batteries and was only some kind of noise but no stations. I checked and the capacitors were dry and the insulation in the wire were almost missing, I replaced allcapacitor and resistor and wires, the radio is very small and dificult to work, but now the radio is dead, no noise, I connect one audi signal from my oscillator to the grid of 3S4 and nothing, audio transformer is OK also the speaker.
:Some ideas?
:See the schematic in http://www.nostalgiaair.org/PagesByModel/983/M0014983.pdf
:Thanks a lot

Hi Norm:
The voltages in the tubes between pins #1 and #7 have 1.5 volts, in the tube 3S4 there are un jumper between pin #1 and #7 and voltage 1.5 volts to pin # 5.
I used 1.5 volts for A battery and 68.3 volts for B battery, My power supply is integred with 10 batteries of 9 volts and a couple 1.5 volts.
All my plates and screen are positive according with schematic.
Thanks Norm
Jordi
:Hi Jordi
:
: Measure voltages on your tubes. Tubes in your radio starting with "1" should have 1.5 volts between pins #1 and #7. Your 3S4 should have 1.5 volts between pin #1 and #5.
:
: This radio uses a 67 1/2 volt B battery. Check plates & screen on each tube. They should be positive. The schematic shows voltages.
:
:http://www.nostalgiaair.org/PagesByModel/983/M0014983.pdf
:
:Norm
:
::I bought one radio RCA 54B3 in Ebay. I connected the batteries and was only some kind of noise but no stations. I checked and the capacitors were dry and the insulation in the wire were almost missing, I replaced allcapacitor and resistor and wires, the radio is very small and dificult to work, but now the radio is dead, no noise, I connect one audi signal from my oscillator to the grid of 3S4 and nothing, audio transformer is OK also the speaker.
::Some ideas?
::See the schematic in http://www.nostalgiaair.org/PagesByModel/983/M0014983.pdf
::Thanks a lot

:Hi Norm.
I rechecked the voltages one more time. I found that I forgot connect the "E" gronding strip to Tube Shel Sub-assembly, now the radio is working nice.
But the central part of the switch S1, that connects the negative size of the batteries to groud is broken, this switch works with the lid.
Thanks one more time.
It is a pity that you are not in my town.
Jordi

:Hi Jordi
:
: Measure voltages on your tubes. Tubes in your radio starting with "1" should have 1.5 volts between pins #1 and #7. Your 3S4 should have 1.5 volts between pin #1 and #5.
:
: This radio uses a 67 1/2 volt B battery. Check plates & screen on each tube. They should be positive. The schematic shows voltages.
:
:http://www.nostalgiaair.org/PagesByModel/983/M0014983.pdf
:
:Norm
:
::I bought one radio RCA 54B3 in Ebay. I connected the batteries and was only some kind of noise but no stations. I checked and the capacitors were dry and the insulation in the wire were almost missing, I replaced allcapacitor and resistor and wires, the radio is very small and dificult to work, but now the radio is dead, no noise, I connect one audi signal from my oscillator to the grid of 3S4 and nothing, audio transformer is OK also the speaker.
::Some ideas?
::See the schematic in http://www.nostalgiaair.org/PagesByModel/983/M0014983.pdf
::Thanks a lot