Thanks for any help.
JG.
31 is the on/off switch. 1 is the volume control. The dotted line indicates that the two are mechanically linked to eachother. Your set doesn't have a tone control. The volume control should have one wire going to the chassis (or be connected to the chassis through the shaft bushing). The center wire goes to the antenna coil. The other end terminal goes to the antenna input terminal. The on/off switch should have one wire going to the power cord and the other going to one of the power transformer primary wires.
T.
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:31 is the on/off switch. 1 is the volume control. The dotted line indicates that the two are mechanically linked to eachother. Your set doesn't have a tone control. The volume control should have one wire going to the chassis (or be connected to the chassis through the shaft bushing). The center wire goes to the antenna coil. The other end terminal goes to the antenna input terminal. The on/off switch should have one wire going to the power cord and the other going to one of the power transformer primary wires.
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:T.
Thomas,
Thank you for the info. Why does the antenna go through the antenna switch?
JG.
::
::31 is the on/off switch. 1 is the volume control. The dotted line indicates that the two are mechanically linked to eachother. Your set doesn't have a tone control. The volume control should have one wire going to the chassis (or be connected to the chassis through the shaft bushing). The center wire goes to the antenna coil. The other end terminal goes to the antenna input terminal. The on/off switch should have one wire going to the power cord and the other going to one of the power transformer primary wires.
::
::T.
:Thomas,
:Thank you for the info. Why does the antenna go through the antenna switch?
:JG.
Sorry, meant to say the on/off switch
For yet, mo’ further clarification:
The sets power switch is being mechanically connected to the sets volume control, such that when you turn the volume control just up from its very maximum CCW position, the switch then clicks on and remains on, and enables the provision of power to the set.
There is no antenna switch involoved, with the closest aspect being the volume control in its variable coupling of the antenna signal into the sets first tubes grid circuitry.
Referencing Drawing Iinset #1:
At that minimum volume of the control, there will be a bare MINIMAL RF level of the antenna signal that comes down to the top side of the volume control, and is then being taken off via the rotor wiper of the volume control and feeding over to the antenna coil and then routed over to the input of the #36 tube.
Referencing Drawing Inset #2:
Should the volume control be advanced even further, the decreased resistance from the top of the volume control to its repositioned rotor should now be getting a higher level of antenna signal supplied RF to its rotor and on the path to the input of the #36.
Referencing Drawing Inset #3:
And lastly, if the volume control is advanced to its max CW position, there is minimal resistance from the top of the volume control to its repositioned rotor and the MAX RF should now be getting to the input of the #36.
ACTIVE TESTING:
Incrementally run the volume control towards its MAX CCW position, the volume decreases due to throttled RF input and finall finding that at almost the end of its travel, the power switch is mechanically engaged, with the sets AC power input then being turned off .
The only variance of the “volume control” in this set, is in its actually being a frontal RF signal attenuating device, used both in the TRF and early Superhet receivers.
Shortly afterwards, seems the norm in set design was to go forwards to the first audio stage and have it inserted, such that the just detected audio signal from the detector stage was fed into a typically ½ thru 2 meg VOLUME CONTROL, so that its rotor could then supply a proper / desired level of audio onto the ensuing audio amplification string.
ILLUSTRATIONS: 
73's de Edd
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:For yet, mo’ further clarification:
:
:
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:The sets power switch is being mechanically connected to the sets volume control, such that when you turn the volume control just up from its very maximum CCW position, the switch then clicks on and remains on, and enables the provision of power to the set.
:There is no antenna switch involoved, with the closest aspect being the volume control in its variable coupling of the antenna signal into the sets first tubes grid circuitry.
:
:
:
:Referencing Drawing Iinset #1:
:
:
:
:At that minimum volume of the control, there will be a bare MINIMAL RF level of the antenna signal that comes down to the top side of the volume control, and is then being taken off via the rotor wiper of the volume control and feeding over to the antenna coil and then routed over to the input of the #36 tube.
:
:
:
:Referencing Drawing Inset #2:
:
:
:
:Should the volume control be advanced even further, the decreased resistance from the top of the volume control to its repositioned rotor should now be getting a higher level of antenna signal supplied RF to its rotor and on the path to the input of the #36.
:
:
:
:
:Referencing Drawing Inset #3:
:
:
:
:And lastly, if the volume control is advanced to its max CW position, there is minimal resistance from the top of the volume control to its repositioned rotor and the MAX RF should now be getting to the input of the #36.
:
:
:
:ACTIVE TESTING:
:
:Incrementally run the volume control towards its MAX CCW position, the volume decreases due to throttled RF input and finall finding that at almost the end of its travel, the power switch is mechanically engaged, with the sets AC power input then being turned off .
:
:
:
:The only variance of the “volume control” in this set, is in its actually being a frontal RF signal attenuating device, used both in the TRF and early Superhet receivers.
:
:Shortly afterwards, seems the norm in set design was to go forwards to the first audio stage and have it inserted, such that the just detected audio signal from the detector stage was fed into a typically ½ thru 2 meg VOLUME CONTROL, so that its rotor could then supply a proper / desired level of audio onto the ensuing audio amplification string.
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:ILLUSTRATIONS:
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:73's de Edd
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EDD,
Many thanks for your explanation. It really cleared up that part of the circuit. Do you give classes? I have been at this hobby for several years now and for someone who has absolutely no electrical background it is very hard to learn this amazing science.If you ever go on the lecture circuit(no pun intended)let us know and I will sign up.
JG
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I just finished the electronics on mine at it works GREAT.
I also ordered from AES two #36 tubes as replacements.
Lou
:Getting ready to start on a philco model 80 and noticed a wire coming off of the tone control that goes no where. Looking at the schematic, is it the dotted line from # 31(tone control)to #1? What is # 1?
:Thanks for any help.
:JG.
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