[R-390] The second 390A

[Barry]

Larry raises a good point about metering.  What are you using to measure that voltage on E402?

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: "Larry H" <larry41gm at gmail.com>
> To: "dog" <agfa at hughes.net>
> Cc: "R-390 Forum" <r-390 at mailman.qth.net>
> Sent: Wednesday, July 17, 2019 10:53:40 PM
> Subject: Re: [R-390] The second 390A
> 
> 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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