[MRCA] [MMRCG] DY-105B testing questions

[Jason WA6BBQ]

Thanks Ray!

On Mon, Apr 27, 2026 at 11:30 Ray Fantini <RAFANTINI at salisbury.edu> wrote:

> The ballast regulator tubes only work when under load. Have done a couple
> of GRC-9 and BC-1306 sets and for me I just connect them up and go.
> Generally, the voltages will be less unless someone screws up the box. But
> unloaded voltages will always be over. Without the regular load, it will
> show applied voltage.
>
>
> Ray F/KA3EKH
>
>
>
>
>
> ------------------------------
> *From:* MMRCG at groups.io <MMRCG at groups.io> on behalf of Jason Sogolow via
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> *Sent:* Monday, April 27, 2026 1:39 PM
> *To:* MMRCG at groups.io <MMRCG at groups.io>; MRCG-West at groups.io <
> MRCG-West at groups.io>; mrca at mailman.qth.net <mrca at mailman.qth.net>
> *Subject:* [MMRCG] DY-105B testing questions
>
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> Hi, I’d like to test and verify that my DY-105B is putting out correct and
> safe voltages before attempting to power up my GRC-9 with it.
>
> I can trick the dynamotor into starting and can see appropriate HV, but
> all the low voltage circuits apparently want to see a load, and that load
> appears to be integral to regulation.
>
> Open circuit, the 1.5v supply shows 24 volts… Not confidence inspiring.
> Blowing up one 3v flashlight bulb is one too many.
>
> Has anyone come up with test loads that would cause the thing to operate
> as expected?
>
> Thanks,
> Jason WA6BBQ.
> _._,_._,_
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