Careful operating on reduced voltage!
It is not a good idea to operate tube type television receivers on reduced voltage between approximately over 50 volts and less than 100 volts. This is more potentially damaging in the case of vintage color receivers. Once sufficient filament power starts the tubes to conduct but the B+ is insufficient to provide proper oeration, the horizontal output tube can be placed conducting excessive current through the flyback without the H. oscillator operating. This excess current can burn out the flyback. In the case of vintage color receivers, the flyback is a critical and often hard to find replacement part.
If one wishes to form electrolytics in a vintage tube TV at reduced line voltage from a variac, best to pull the horizontal output tube during the process.
Rob
|
03-25-2003, 12:52 AM
Threaded Mode