[R-390] The second 390A

[Larry H]

Dave, Good news on the 390A.

The dc voltage on the E402 is oscillator grid leak and is sometimes tricky
to measure. It gets loaded down very easily.  Try putting a 100k res in
series with meter probe to isolate it or a different vtvm with less
loading.  Since you can measure that oscillators effectiveness at E210, you
may not need to measure it.  You can get a different reading on each 1 mh
band from 8mh up.  Do each of the bands trimmers peak correctly on the 2nd
xtal osc?  T401 should be adjusted so that all bands will peak.  This is a
sensitive adjustment, but if it can not be done, then there might be a
problem in that osc.

Good work on your 390s.

Regards, Larry

On Wed, Jul 17, 2019 at 7:23 PM dog <agfa at hughes.net> wrote:

> I got the second RX put back together today, new meters, all the stuff
> soldered back in place, all the modules installed, new re-wired PS with
> the tubes, turn it on and it plays, noise from the headphone jack, BW,
> BFO, Meters, etc seem to work. Check the osc voltages and E209 is
> -9.4VDC, E210 is -2.2VDC, E211 is -2.65VDC, (not too bad) but E402 is 0.
> Test the #1 390A which is working and the E402 is also 0VDC. What is
> going on here? I haven't put RF into the newly fixed input yet.
>
> I also need one of those BNC to mini BNC adapters (J116) for the IF
> module. Stole it out of the other RX for now to test stuff. I don't
> think I every got a DC voltage reading on E402 in the past, I'm
> wondering what that is about, especially when the fixed RX works?
>
> Got a lot done today getting the old one back together without too much
> missing.
>
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