[Heathkit] Heath HP-23 question

[crawfish]

The 250 vdc is used on the HW-12,-22, and-32 radios because that is the
screen voltage used by the 6GE5's or whatever the finals were in those
radios. The 6146 tube runs 300 vdc on the screens.

Joe W4AAB
----- Original Message -----
From: Kenneth G. Gordon <kgordon at moscow.com>
To: Richard Franzson <franzsrf at umdnj.edu>
Cc: <Heathkit at mailman.qth.net>
Sent: Wednesday, April 27, 2005 3:36 PM
Subject: Re: [Heathkit] Heath HP-23 question


> Richard Franzson wrote:
>
> > Also,  can someone please tell me why the newer HP 23 power supply has
> > an option for voltage levels. And the old version HP 23 did not.
>
> I forgot to answer this last part: the very first model of the HP-23 (one
of
> which I just finished rebuilding) DOES have an option for the 250/300
> VDC voltage levels, but it is only available via a wiring change internal
> to the supply. When you are building the supply you connect a
> particular wire to one point for 250 VDC output, and to another point for
> 300 VDC output.
>
> Kees has told us about the development of the various versions. IMHO,
> the HP-23A (which you have) is the best choice because of its multiple
> outputs, switching, and breaker.
>
> My early HP-23 is the next choice, as it does have all the outputs of the
> HP-23A, but has no switch, nor breaker. In fact, I had to mount a fuse
> holder in mine since originally it used that somewhat dangerous dual-
> fused plug for safety. I got rid of that and went to a three-wire cord and
> a slow-blow fuse in a chassis mounted fuse holder.
>
> Later models don't have as many choices of voltage outputs.
>
> Ken W7EKB
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