[Boatanchors] Potentiometer

[Rodger]

Hi Joe,

You will need a wire wound as the regular carbon units are not 
sufficient to withstand the power dissipated in this circuit.  I thought 
I found a source at Digikey but looking closely at the specs for the 
Digikey unit shows that the actual wattage rating in use (under normal 
ambient temperature ratings) is only about 1 watt instead of the 4 watt 
rating advertised.

I managed to find a NOS replacement for my Viking 500 but the next time 
one goes out in one of my Johnson or Heathkit rigs I think I will 
replace it with a circuit like the one in this link:  
http://www.amwindow.org/tech/htm/drivepot.htm  I think that this idea 
also was published in Electric Radio.

73, Rodger WQ9E

kk4tr wrote:
> I was wondering if anyone out there knows of a place that I can get 
> Potentiometers for my Viking Valiant.  Yhe Grid drive control took a 
> dump yesterday morning and I have been having difficulty finding a 
> place to buy one either nos stock or even a brand new one.  The one 
> that I need is a 25K, 4 watt wire wound unit.  I think I replaced this 
> one once before so a regular carbon will work .  The last one was and 
> I think it lasted about 10 years!!!!! Any help would be greatly 
> appriciated
>
> Joe KK4TR
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