[Milsurplus] VR tube question

[J. Forster]

I don't have a drawing but I'd guess you have a bad filter cap downstream
of the regulator tube.

Many VRs have two pins shorted so that if the VR tube is pulled, the
downstream stuff does not over voltage.

If you pull the VR tube, the supply side will jump up.

FWIW,

-John

==============


> Greetings to the list.  I'm hoping someone can help me-I'm a pretty
> inexperienced serviceman.
>
> I've been working this morning on a T-195 with (apparently) no MO
> output.  I've traced the problem back to the voltage regulator module
> next to the PTO.
>
> Checking at the MO plug I had no +150V regulated.  I checked the
> limiting resistor which is 3K-just like it's supposed to be. But, when
> I replaced the OA2 with 2 others I had, there was no change-still no
> 150V.
>
> When I pull the regulator tube I have 250 volts at pin 1, with the
> tubes in this drops to nothing.
>
> Is this just a case of three bad 0A2s?
>
> Help!
> Robert
> W7MKA
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