[Boatanchors] Hallicrafters S-77 ballast resistors.

[Al Klase]

Brian,

 From an Ohm's law standpoint, assuming 120 VAC and a 300 mA heater 
string, I'd expect the resistors shunting the #47 lamps to be 22 ohms, 
and the third resistor to be 68 ohms.  Actual dissipation would be 1 
watt in each 22 and 6 watts in the 68, multiply by at least two for safety.

Al

On 7/20/2010 6:59 PM, Brian Goldsmith wrote:
> Greetings to all.Would anyone have the full details of the ballast resistor
> R38 setup in S77A?It came in two versions, 117Volt and 220Volt.There is some
> information hand written into one of the manuals I have however,the resistor
> values seem to be incorrect.
>
> Thanks,Brian G.
>
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/