10-08-2014, 09:45 PM
I mean the resistor in the middle of the chained tubes filaments.
It is pretty simple: when ON, you have to have continuity in hundreds of Ohms between the AC plug's prongs consisting of filaments and that resistor I mentioned.
There is a tap from the rectifier filament for the pilot light, if we assume 1/2 the filament is dead and the lightbulb is too, or another 1/2 of it is dead, or any tube's filament is dead, then there will be no continuity.
It is pretty simple: when ON, you have to have continuity in hundreds of Ohms between the AC plug's prongs consisting of filaments and that resistor I mentioned.
There is a tap from the rectifier filament for the pilot light, if we assume 1/2 the filament is dead and the lightbulb is too, or another 1/2 of it is dead, or any tube's filament is dead, then there will be no continuity.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
