09-02-2019, 08:25 PM
I recapped a PT-10 and it seems to work except for blowing the pilot light after 3-4 minutes after turning on. When the first blew, I chalked it off to it being 50-60 years old, but it did the same with a fresh one.
The rectifier is a 35Z3, so there isn't a problem with the center tap filament issue. I have traced the heater circuit and don't see anything out of the ordinary. The pilot light holder appears in fine shape, no corrosion, etc.
The 40 ohm resistor in parallel with the pilot lamp measures 42 ohms, so that should be ok.
Only thing odd I have noticed is that the set only draws 0.2 amps, which seems low compared to other sets I have worked on. They usually run 0.4 - 0.6 amps when on.
Any thoughts on this?
Thanks,
John
The rectifier is a 35Z3, so there isn't a problem with the center tap filament issue. I have traced the heater circuit and don't see anything out of the ordinary. The pilot light holder appears in fine shape, no corrosion, etc.
The 40 ohm resistor in parallel with the pilot lamp measures 42 ohms, so that should be ok.
Only thing odd I have noticed is that the set only draws 0.2 amps, which seems low compared to other sets I have worked on. They usually run 0.4 - 0.6 amps when on.
Any thoughts on this?
Thanks,
John
