HW-12A Help Needed

[Gregg]

Hi Doug,

Have you tested and/or replaced (or "reformed") the capacitors?  You really
cannot go on to troubleshooting the performance of the unit until you have
confirmed the operational condition of the components.  You have ruled out the
resistors, but the condition of the capacitors are equally (if not more)
important.

Best of luck to you.

Sincerely,
Gregg

---------------ORIGINAL MESSAGE-----------------
> Date: Tue, 16 Jan 2007 10:47:48 -0800
> From: "Davies, Doug A FOR:EX" <Doug.Davies at GOV.BC.CA>
> Subject: HW-12A Help Needed
>
> I'm in the process of restoring an HW-12A and need some help.  I
> managed to obtain the resistance/voltage charts for the rig and have
> gone through the transmitter section.  So far, I have replaced two
> bad resistors and the 12BY7 driver tube.  I followed the transmitter
> alignment procedure but could obtain only a very small output reading
> on the rig's meter.  In the manual, it says that coils L2 and L3 were
> factory adjusted and shoulld not be tweaked.  Figuring that someone,
> somewhere couldn't have resisted fiddling with those, I started
> adjusting L2, the grid drive coil, with the function switch in the
> TUNE position and, low and behold, the meter started showing output.
> I stopped here not really sure what the meter was measuring as I
> adjusted L2.  Does anyone know what the meter is measuring here?
> If it's grid current, what meter reading should I be looking for?
> All the alignment instructions say is to tune for "maximum meter
> reading" for all of the other adjustments.  Any and all help is
> appreciated.
>
> Doug  VE7DRF
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