[Heathkit] HP-23(*) - voltage measurements under load.

[Kenneth G. Gordon]

In both cases: the load is a restored and heavily used HW-101, all 
tubes are checked and/or new. Load for the transmitter is a 600 
watt military dummy load. Band is 80 meters, frequency is 3.800 
Mhz. The power supplies are sitting side-by-side on the bench, 
plugged into the same duplex outlet. Both power supplies have 
been rebuilt using the same NIB capacitors and diodes.

Voltages measured under load, transmitter loaded to max power 
output. Voltages measured with calibrated digital VOM.

HP-23				HP-23B
686 VDC			720VDC
319.4/245.6 VDC		320/256 VDC
-73.7 VDC			-80 VDC (measured at bias adj. 
pot)
12.65 VAC			13.25 VAC

Power output measured in the "Tune" condition, all properly loaded, 
is an indicated 125 watts in both cases. (I suspect the wattmeter, 
an old military job using dry non-inductive resistors, is not entirely 
accurate.)

So, my conclusion: since it appears that everything else, whether 
internal or external to the power supplies appears to be identical, 
that Heathkit DID upgrade the power transformers between models 
of HP-23(*).

Ken Gordon W7EKB