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The HP-23
family of Power Supplies for the SB-series
started with the HP-23 in
1963. It was replaced by the HP-23A in 1968, which in turn was
replaced by the HP-23B in
1973, which in turn was replaced by the HP-23C in 1978 and was
produced until 1979. The
Hewlett Packard Company did not let the Heath
Company use HP as a
designation for their products so the HP-23C
then became PS-23. It can either stand alone or be placed
inside the SB-600
speaker box, like in my
case. Even if these power supplies originally were meant for the SB-series they also became the
standard power supply for the HW-100/HW-101.
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