Calibrator for HW 12

[Ed Lambert" "K1ZOK]

On page 61 of the HW-12 manual it identifies resistor R5 as being used to
drop the filament voltage to 6 volts..  so it expects the 6 volt tube.
The specs page (3) is to show the tube draws 300 milliampere filament
current, but from the 12 volt source through the dropping resistor.
Can't comment on the pinout as I don't have a manual for the calibrator.

Ed
K1ZOK


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.
>         The set has a blank octal socket for a plug-in crystal
> calibrator
> accessory.

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.
>

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