Gents I have a arc 5 transmitter which calls for 550-650 v.d.c. can I plug my heath kit hk23b power supply into the variac and lower the A.C. going into the P.S. ? 73 darryl

I seriously doubt that your Heathkit PS can deliver the type of current needed to operate a transmitter.

If you mean an HP23B power supply (I think Hewlett Packard made them stop using HP and the last ones made were labled HK...) the answer would probably be yes. Of course if you crank down the HV the filament voltage will be lower as well. So you may have to get your filament voltage for the ARC 5 from something separate.

The HP23, 23A, 23B and 23C were used to supply the whole SB100, 101, 102, HW100, and 101 series of 200 watt HF transceivers.

Here are the specs.

Specifications—Power Requirements: 120 volts AC, 50-60 cycles, 350 watt maximum. High voltage output: 820 volts DC, no load; 100 watts DC @ 250 ma. AC ripple: Less than 1% @ 250 ma. Duty cycle: 150 ma continuous, 150 ma to 300 ma @ 50%. Low voltage output: (High Tap) 350 volts DC no load; 300 volts DC @ 150 ma. (Low Tap) 275 volts DC, no load; 250 volts DC @ 100 ma. Less than .05% AC ripple @ 150 ma, continuous duty to 175 ma. Fixed bias: –130 volts DC, no load; –100 volts DC @ 30 ma. Adjustable bias: –40 to –80 volts DC @ 1 ma maximum. Less than .5% AC ripple. Continuous duty to 20 ma. Filament voltage: 6.3 V. AC @ 11 amps; 12.6 V. AC @ 5.5 amps. Dimensions: 9" L x 4¾ W x 8¾ H.

Curtis Eickerman

Hi Curtic I was going to use a 24 v.d.c. seperate from the high voltage not connected to the variac tnx for the info 73 darryl