SB-200 Power Supply

[John King]

I have several Heathkit linear amplifiers and they are
notorius for having the metering resistors change in
value. They are multiplier resistors and if they
change value, over time, the indicated plate voltage
will change accordingly.

You might just change the metering resistors to new
ones of correct value and note the proper plate
voltage indication. 

The difference in capacitance of the filters would
not, in my opinion, be the culprit. 73, John, K5PGW

--- "James A. Sutherin" <jsutherin at FLOYDBROWNE.COM>
wrote:

> The above amplifier is wired for 120volt. When I was
> bring the power
> supply up using a variac, I noticed when the input
> voltage was 120 the
> HV on the panel meter only read about 1800volts. The
> power supply cap's
> had been changed by the previous owner to 100uf /
> 450 vdc cap's. I
> realize the original cap's were 125uf. 450vdc. Is
> there anything I
> should check to see why I'm only getting 1800 vdc
> instead of the 2400
> +/- vdc.? Would having the 100uf cap's instead of
> the 125uf make that
> much difference? 
> 
>  
> 
>  
> 
> Thanks 
> 
> Jim K8DHC
> 
>  
> 
>  
> 
>  
> 
>  
> 
> 
>
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