[R-390] Learning about vacuum tubes

[Norm n3ykf]

The one I have has a diagram and explanation of a "relaxation
oscillator". Looks much like the calibration oscillator in the -390a.
Norm n3ykf

On Tue, Oct 25, 2016 at 7:41 PM, Perry Sandeen via R-390
<r-390 at mailman.qth.net> wrote:
> List,
>
> If one wants to learn about vacuum tubes, Ebay has a list of mostly RCA manuals and some are on CD.
>
> IIRC mine are version RC-21 but any in that vintage will do. Besides learning how tubes and tube circuits work they have listings or the proper voltage levels under the specific tube number.
> One quickly learns that at least many SP 600's were built to non- recommended values. I wouldn't be surprised if other name brand B/A radios suffer a similar fate.
> Regards,
> Perrier
>
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