I'm continuing restorationof my Philco 37-38 battery set. I've replaced electrolytic and other capacitors. Voltages appear good. By touching plate with probe on 1E5 I get some static through the speaker; otherwise, no sound not even hum form speaker. I'm running A votlage off a storage battery with dropping resistor. A voltage measures 1.8 volts on filament pins. Perhaps too low?
Any help appreciated.

Brian

Try touching the grid of the 1E5G or center terminal on your volume control. That should cause a loud hum.

If not, measure plate voltages on 1H4G driver, 1E5G and 1J6G. It's not unusual to have an open audio transformer.

1.8 volts may be too low to receive stations but not to test audio section. The 1C7G tube may not oscillate with 1.8 volts on the filament.

http://www.nostalgiaair.org/PagesByModel/204/M0013204.pdf

Norm

:I'm continuing restorationof my Philco 37-38 battery set. I've replaced electrolytic and other capacitors. Voltages appear good. By touching plate with probe on 1E5 I get some static through the speaker; otherwise, no sound not even hum form speaker. I'm running A votlage off a storage battery with dropping resistor. A voltage measures 1.8 volts on filament pins. Perhaps too low?
:Any help appreciated.

Loud hum at volume control, and by attaching my sig gen to test output, I was able to receive three local stations. Further, by touching bare shaft of volume control I picked up same stations quite loud and clear. My problem now is in the front end I take it.

By touching grid cap of 1D5 I completely ground out reception.

:Brian
:
: Try touching the grid of the 1E5G or center terminal on your volume control. That should cause a loud hum.
:
: If not, measure plate voltages on 1H4G driver, 1E5G and 1J6G. It's not unusual to have an open audio transformer.
:
: 1.8 volts may be too low to receive stations but not to test audio section. The 1C7G tube may not oscillate with 1.8 volts on the filament.
:
:http://www.nostalgiaair.org/PagesByModel/204/M0013204.pdf
:
:Norm
:
:
::I'm continuing restorationof my Philco 37-38 battery set. I've replaced electrolytic and other capacitors. Voltages appear good. By touching plate with probe on 1E5 I get some static through the speaker; otherwise, no sound not even hum form speaker. I'm running A votlage off a storage battery with dropping resistor. A voltage measures 1.8 volts on filament pins. Perhaps too low?
::Any help appreciated.

Brian

Touching top of the 1D5 should stop reception. This is input to the IF amplifier. Touching top of the 1C7 might improve reception. This is a point where signals from the antenna start to be amplified.

Have you aligned the radio?

Norm

:Loud hum at volume control, and by attaching my sig gen to test output, I was able to receive three local stations. Further, by touching bare shaft of volume control I picked up same stations quite loud and clear. My problem now is in the front end I take it.
:
:By touching grid cap of 1D5 I completely ground out reception.
:
::Brian
::
:: Try touching the grid of the 1E5G or center terminal on your volume control. That should cause a loud hum.
::
:: If not, measure plate voltages on 1H4G driver, 1E5G and 1J6G. It's not unusual to have an open audio transformer.
::
:: 1.8 volts may be too low to receive stations but not to test audio section. The 1C7G tube may not oscillate with 1.8 volts on the filament.
::
::http://www.nostalgiaair.org/PagesByModel/204/M0013204.pdf
::
::Norm
::
::
:::I'm continuing restorationof my Philco 37-38 battery set. I've replaced electrolytic and other capacitors. Voltages appear good. By touching plate with probe on 1E5 I get some static through the speaker; otherwise, no sound not even hum form speaker. I'm running A votlage off a storage battery with dropping resistor. A voltage measures 1.8 volts on filament pins. Perhaps too low?
:::Any help appreciated.