Hi All,
I have a Panel light for my TW Xpress build, Its is a 120vac, I am in australia and my PT is a 240vac, What resistor value do i need to make it compatable with 240vac.
Regards Peter
Panel Light
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Cliff Schecht
- Posts: 2629
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Re: Panel Light
You need the full operating temperature current draw of the pilot light to know what the resistor value should be. If you know this then the calculation is simply R=(240V-120V)/I, where I is current the light draws. The problem is that if the pilot light draws more than 50mA of current then you're looking at at least a 10W resistor and a big waste of power (although tube amps in general are a big waste of power 
).
).Cliff Schecht - Circuit P.I.
Re: Panel Light
Do you have a dual-primary PT, with 2x 120V primaries in series?
If so then just parallel the lamp across one of the primaries and it'll run happily at 120V.
If so then just parallel the lamp across one of the primaries and it'll run happily at 120V.
Re: Panel Light
My PT has 0, 100, 120, 220, 230, 240, taps, if I use 0 and 120, will that work ok?
peter
peter
Re: Panel Light
Yep, that'll work fine.