Calibrator for HW 12

[Ed Richards]

It should work. If I remember right, there is a 20 ohm, 2 watt resistor
in the filiament circuit of the HW-12 to allow for a 6 volt tube.
73,
Ed

On Sat, 19 Aug 2000 04:51:06 -0500 Ken Ketner
<ketner at ARISBEASSOCIATES.COM> writes:
> Greetings ether agitators:
>
> I have been restoring a Heath HW 12 80 m monobander. Things are
> coming
> along well. I’m almost to the smoke test stage. But I have a
> question
> for the experts.
>         The set has a blank octal socket for a plug-in crystal
> calibrator
> accessory. In the manual, the calibration section, mention is made
> of
> using a Heath HRA 10-1 calibrator. I have one of those. But in
> examining
> the circuit for it, it doesn’t look like it will work. The spec page
> of
> the manual for the HW 12 appears to call for a 12 volt tube in the
> calibrator section, and HRA uses a 6BA6. And the pin-outs don’t seem
> right to use the HRA in the HW 12.
>
> So I was wondering if anyone has had experience using the HRA in a
> monobander such as HW 12.
> --
>
> Ken Ketner
> ARS KA5ELD
>
> email:
>         home:   ketner at arisbeassociates.com
>         office: b9oky at ttacs.ttu.edu
>
> PO Box 65135
> Lubbock, TX 79464
>
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