[Heath] SB-200 - another issue

[Kenneth G. Gordon]

So, in checking filament voltage under load, I find that mine is 6.67 VAC, which is a bit high. 
572B is rated at 6.3VAC +/-0.5 V. Eimac notes that reduction of filament voltage contributes 
to additional life for the tubes.

So, I'll be reducing that to around 6.15 VAC or so.

Secondly, the lamp which is mounted in a hole in the back of the meter has melted and 
distorted the meter's case. So I replaced that lamp with 3 ea 10 mm white LEDs and a small 
power supply from 1/2 the filament supply.

Looks nice, although the light is awfully white. I'd prefer a slight yellow cast to it, but this is 
OK.

After I have reduced the filament voltage and repaired one knob, I'll install a set of new 
tubes, reassemble the amp, and loan it to one of our locals for a while.

Ken W7EKB

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