Hello gentlemen,

I am about to start to restore this radio.

All of the battery and AC power wires have been cut off.

I want to restore it to AC power operation. There are three wires that seem to be for AC operation, (3), one seems to be a resistance wire. Do I need to add a 300 ohm resistor in the line circuit to operate this radio?

Explanation on this power connection is appreciated.

Also, can someone give me the tube line up as I cannot read anything on the tubes and the schematic is too blurred to tell.

Much appreciated,

Mitch

That 3rd wire is a filament dropping resistor that was wire wound in the line cord. You would need a resistor around 20 watts mounted in the radio. The tube line up is 1Q5 = Audio output. 25Z6 = rectifier. 1H5 = detector.
1A7 = converter.
1N5 = IF amp. 1N5 = RF amp.
There is a trick to use an AC diode and a lower wattage and value resistor. Works well less heat.

:That 3rd wire is a filament dropping resistor that was wire wound in the line cord. You would need a resistor around 20 watts mounted in the radio. The tube line up is 1Q5 = Audio output. 25Z6 = rectifier. 1H5 = detector.
:1A7 = converter.
:1N5 = IF amp. 1N5 = RF amp.
: There is a trick to use an AC diode and a lower wattage and value resistor. Works well less heat.
:

What is the trick with the diode and the resistor?

Mitch

Hi Mitch,
You could dump the hot resistor if you use a 117Z4GT in place of the 25Z6 and rewire the socket.
Best regards,

Bill Grimm

:Hello gentlemen,
:
:I am about to start to restore this radio.
:
:All of the battery and AC power wires have been cut off.
:
:I want to restore it to AC power operation. There are three wires that seem to be for AC operation, (3), one seems to be a resistance wire. Do I need to add a 300 ohm resistor in the line circuit to operate this radio?
:
:Explanation on this power connection is appreciated.
:
:Also, can someone give me the tube line up as I cannot read anything on the tubes and the schematic is too blurred to tell.
:
:Much appreciated,
:
:Mitch
:
Mitch,
The Beitman schematic is a lot clearer than the Riders:
http://techpreservation.dyndns.org/schematics/41/41_Pilot_T186_117.djvu
Carl T

::Hello gentlemen,
::
::I am about to start to restore this radio.
::
::All of the battery and AC power wires have been cut off.
::
::I want to restore it to AC power operation. There are three wires that seem to be for AC operation, (3), one seems to be a resistance wire. Do I need to add a 300 ohm resistor in the line circuit to operate this radio?
::
::Explanation on this power connection is appreciated.
::
::Also, can someone give me the tube line up as I cannot read anything on the tubes and the schematic is too blurred to tell.
::
::Much appreciated,
::
::Mitch
::
:Mitch,
:The Beitman schematic is a lot clearer than the Riders:
:http://techpreservation.dyndns.org/schematics/41/41_Pilot_T186_117.djvu
:Carl T
:
Thank you everyone,

I have DJVU and did download the 1941 info. Schematic is much better.

Mitch