I'm presently working on a battery set (R414 see other posting for Stewart Warner Brigadier II). Filament A voltage is always low on cold start up (about 1.7 volts). after some fiddling with the variable capacitor it pops up to 2 volts. Would this problem be in the volume control?

Where are you measuring and how long does it take to come up? The tubes will draw more current when cold, then less as the filaments warm up. This should be quick.

:I'm presently working on a battery set (R414 see other posting for Stewart Warner Brigadier II). Filament A voltage is always low on cold start up (about 1.7 volts). after some fiddling with the variable capacitor it pops up to 2 volts. Would this problem be in the volume control?

Hi

Tubes in this radio are filament type. They will come up to operating within seconds. Could you have a bad bsttery connection? Is battery voltage low? There is a resistor in series with the "A" battery. Could it be high in value. Does it happen when the switch across the resistor is closed?

Variable capacitor should have no effect in filament voltage unless there is a bad battery connection. Then any movement may cause filament voltage to change.

Norm

:I'm presently working on a battery set (R414 see other posting for Stewart Warner Brigadier II). Filament A voltage is always low on cold start up (about 1.7 volts). after some fiddling with the variable capacitor it pops up to 2 volts. Would this problem be in the volume control?

A combination of battery connections and low voltage seems to be the problem. Why is that switch open for use with an air cell? I've never understood what an air cell is.

:Hi
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: Tubes in this radio are filament type. They will come up to operating within seconds. Could you have a bad bsttery connection? Is battery voltage low? There is a resistor in series with the "A" battery. Could it be high in value. Does it happen when the switch across the resistor is closed?
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: Variable capacitor should have no effect in filament voltage unless there is a bad battery connection. Then any movement may cause filament voltage to change.
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:Norm
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::I'm presently working on a battery set (R414 see other posting for Stewart Warner Brigadier II). Filament A voltage is always low on cold start up (about 1.7 volts). after some fiddling with the variable capacitor it pops up to 2 volts. Would this problem be in the volume control?

:A combination of battery connections and low voltage seems to be the problem. Why is that switch open for use with an air cell? I've never understood what an air cell is.

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Sir Brian . . . . Someone clued me in on the old terminology of an “air” cell a bit back, as I was previously having one H E dub’l hockey sticks of a time, in the finding of a Schrader valve location on it ! That terminology was making reference the Lead Acid type of storage battery cell, in place of the then, more commonly utilized. . . one- shot. . . . carbon zinc cell. If you were using a carbon zinc cell for the sets filament [A] supply, its fresh output would be in the order of 1.5 VDC . . .which is in like step with the filament supply voltage needs. NOW, should you be using a lead acid cell for the filament supply, its voltage output is MORE in the vicinity of 2 VDC plus. That is where the opening of the switch comes in play, with it then inserting that series voltage dropping resistor in line to the get the resultant filament supply level down to that desired 1.5 VDC level. THASSSSSIT 73's de Edd

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::A combination of battery connections and low voltage seems to be the problem. Why is that switch open for use with an air cell? I've never understood what an air cell is.
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: : : : : : : : : : : : : : :Sir Brian . . . . : : : : :Someone clued me in on the old terminology of an “air” cell a bit back, as I was previously having one H E dub’l hockey sticks of a time, in the finding of a Schrader valve location on it ! : :That terminology was making reference the Lead Acid type of storage battery cell, in place of the then, : :more commonly utilized. . . one- shot. . . . carbon zinc cell. : :If you were using a carbon zinc cell for the sets filament [A] supply, its fresh output would be in the order of 1.5 VDC . . .which is in like step with the filament supply voltage needs. : :NOW, should you be using a lead acid cell for the filament supply, its voltage output is MORE in the vicinity :of 2 VDC plus. That is where the opening of the switch comes in play, with it then inserting that series voltage dropping resistor in line to the get the resultant filament supply level down to that desired 1.5 VDC level. : : :THASSSSSIT : : : : :73's de Edd : : : : : : :

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That leads me to believe that the open switch would be the "air cell"? What I mean is schematically the open symbol would be similar to a batt cell and in reakity there is no cell ergo "air cell"? PL