[Boatanchors] re:resistor mounting

Mon, 21 Apr 2003 13:55:50 -0700

3100-360=2740V across 80K=94 watts. and smoke from a 50 watt resistor.

WBob

[email protected] wrote:
> I did not explain the situation correctly as one alert listmember
> mentioned. 
> 
> The circuit has a 3100V B+ line and the 80K 50W resistor taps off of
> that and then feed a 3 tube (OA2, OB2-OB2 if i remember correctly)
> regulator to give me 360V for the screens of a pair of 4CX350 tubes.  
> 
> Thats a TMC PAL-500 amp circuit.  Perhaps the resistor coating material
> had a flaw which allowed it to fail.  Don't know, don't care, maybe just
> operator error.  Just need to get suitable resistors and/or capabilities
> to mount a different type, do it correctly and without having to worry
> about another failure.
> 
> Thanks again to the listmember who asked to see if the calculations were
> correct or if i knew what i was doing!!!! hi hi.
> 
> larry
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