[Test-Equipment] 525A Frequency Converter

[Albert LaFrance]

I have a couple of HP 523DR counters, which are probably a similar design to
the 524B but don't use plug-ins.  They're 9-in. high rack-mount units, heavy
(of course), have six decades of neon-lamp displays, Lucite rods illuminated
by incandescent lamps for decimal points, and count up to a whopping 2 MHz.

What's fun is to take the cover off, turn out the lights, and just enjoy the
beauty of those 70-80 vacuum tubes glowing - not to mention that wonderful
scent of vintage electronics!

Albert LaFrance

----- Original Message -----
From: <w8au@sssnet.com>
To: <test-equipment@mailman.qth.net>
Sent: Saturday, February 07, 2004 6:28 PM
Subject: Re: [Test-Equipment] 525A Frequency Converter


> At 01:08 PM 02/07/2004, GROSSMANCR@aol.com wrote:
> >Just uncovered a new, or like new, 525A  Frequency Converter Unit, with
copy
> >of operating and servicing manual  Does anyone know what this unit is
worth?
>
> If memory serves, this was a plug-in designed for the basic HP 524B series
freq
> counters that were 2.5 ft cubes full of tubes and the vertical neon bulb
> decade
> counters.... good for counting up to 10 mHz and using the converters to go
> higher.
>
> Fun things to use (and maintain) back in the fifties/sixties, but of no
value
> today except for an HP museum.
>
> Ya hate to see any classic junk destroyed or parted out, but just who
might
> find it usable is a good question.
>
> Hope this helps...
>
> Perry    w8au