Note
HP-23 1963-1968 $39.95
HP-23A 1968-1972 $59.50
HP-23B 1972-1977 $51.95
HP-23C 1977-1979 $57.95
PS-23 1979-1983 $59.95
These power supplies were designed specifically for the SB and HW series of radios, but can be used with a variety of other commercial and home brew equipment. The units provide all high, low, bias, and filament voltages needed. Voltage doubler circuits are used in both the high and low voltage sections. The four versions of the HP-23 differ only in small ways—their basic specifications are all the same.
MODEL CHARACTERISTICS
HP-23 has on/off toggle switch and pilot light (styles vary). Choice of 250 or 300 volt (low voltage) B+ is made by wiring option during assembly. Provides both fixed and adjustable bias, as well as 6 and 12 volt filaments. Fused 120 VAC plug. No 240 VAC operation.
HP-23A has on/off switch with selection of 250 or 300 volt B+. No pilot light. Provides both fixed and adjustable bias, as well as 6 and 12 volt filaments. No pilot light. Circuit breaker replaces fused plug. 120 and 240 VAC wiring options.
HP-23B has on/off switch with selection of 250 or 300 volt B+. No pilot light. Provides only fixed bias and only 12 volt filament. No adjustable bias or 6 volt filament. Circuit breaker operation. 120 and 240 VAC wiring options.
HP-23C has no on/off switch, or switch selection of B+. Choice of 250 or 300 volt (low voltage) B+ is made by wiring option during assembly. No adjustable bias or 6 volt filament. No pilot light. Circuit breaker operation. 120 and 240 VAC wiring options.
PS-23 is identical to the HP-23C. The HP-23C was renamed PS-23 when Hewlett Packard objected to the use of the “HP” nomenclature.
References:
Use with Swan 100 series. 73 Amateur Radio. Oct 1964, p. 47
Review. QST. Feb 1966, p. 74.
Switch for 250/300 VDC choice. QST. May 1966, p. 75.
Switch to select 120/240 volt operation. QST. Mar 1973, p. 57.
Improved grounding. QST. May 1974, p. 49.
Low voltage too low. QST. Oct 1977, p. 46.
Revisited. Electric Radio. Dec 2012.
High voltage: 820 VDC no load and 700 VDC @ 250 mA
ripple: less than 1 percent @ 250 mA
high voltage duty cycle: 100% @ 150 mA and 50% @ 300 mA
Low voltage: 350 VDC no load, 300 VDC @ 150 mA (high tap) and 275 VDC no load, 250 VDC @ 100 mA (low tap)
ripple: less than 0.05% at 150 mA
low voltage duty cycle: 100% at 175 mA
Fixed bias voltage: -130 VDC no load, -100 VDC @ 20 mA
ripple: 0.5% at 20 mA
fixed bias duty cycle: 100% @ 20 mA
Adjustable bias voltage: –40 to –80 VDC @ 1 mA maximum
Filament: 6.3 VAC @ 11 amps and 12.6 VAC @ 5.5 amps.
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.
