HP-23 fuse.

[Kenneth G. Gordon]

The first model HP-23 uses a chassis mounted fuse holder: the fuse is 
a 3 amp slow blow. Works just fine. I have one HP-23B in which the 
breaker has been replaced by a chassis mounted fuse holder. The fuse 
in it is a 3 amp slow blow.

Both power supplies work fine.

Who ever told you that a fuse wouldn't work in an HP-23 was probably 
trying to use a fast blow fuse. Those WILL NOT work, since when you 
first turn the switch on, the power supply caps look like a dead short to 
the rectifiers, and that starting surge will blow a fast blow fuse.

Slow blow fuses, made for motor starting, work just fine.

Ken W7EKB

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