10-09-2014, 10:04 PM
http://oldtech.net/Beitman/14-89.gif
This is the sch, I think.
If you look at the prongs, one (top) goes to the filament string, then the end of the string goes to the switch and the other prong.
The resistor in the middle is an NTC thermistor, it starts at about 1K and drops to 100 Ohm as it heats up.
So you should not have a short, but you should have about 1.6kOhm or so when the switch is ON.
Your pot sections DO NOT control power, the switch does. The pot sections control volume or maybe tone.
It'd be nice of you to eventually post the link to the sch if you know where it is. I am not sure whether the one I have is accurate.
This is the sch, I think.
If you look at the prongs, one (top) goes to the filament string, then the end of the string goes to the switch and the other prong.
The resistor in the middle is an NTC thermistor, it starts at about 1K and drops to 100 Ohm as it heats up.
So you should not have a short, but you should have about 1.6kOhm or so when the switch is ON.
Your pot sections DO NOT control power, the switch does. The pot sections control volume or maybe tone.
It'd be nice of you to eventually post the link to the sch if you know where it is. I am not sure whether the one I have is accurate.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
