Les, I just took the PTO out and apart, nothing was apparently wrong, but I reflowed the connections for the 2 caps. Before I put the bottom decks back in, I noticed a connection between the bottom of the RF and the crystal calibrator...like a button that makes contact between them when put together. It was pretty smooshed and not making contact. I fixed that, and after putting it all together...it works.
Loud and clear, the dial is about 25kc off. I might stick the original RF deck back in and see if it's closer and still working, then do an alignment (my first on a R39x...) What a strange issue but im glad it's fixed. Whatever it was... Adam On Sat, Oct 4, 2025, 17:22 Les Locklear <[email protected]> wrote: > Open the PTO don't be scared of it. You will probably find two small temp > compensating caps, 10 pf if my memory is working. They have a tendency to > spring away from their solder connection maybe from a drop or whatever. > Reflow the joint and test. I found that problem with a 1962 Amelco R-390A > PTO. > > Les Locklear > > > ----- Original Message ----- > From: Adam Morehouse <[email protected]> > To: Jacques Fortin <[email protected]> > Cc: R-390 Mailing List <[email protected]> > Sent: 10/4/2025 3:14:56 PM > Subject: Re: [R-390] R-392 > > ________________________________________________________________________________ > > > Alright, so the oscillator is working. I think my problem has to do with > > the PTO. > > > > When I bought the T-195/GRC-19 it came with a tote of parts - I swapped > the > > AF/IF/Crystal Calibrator decks out - made no difference. Then I swapped > RF > > decks - no difference. > > > > I noticed the wiring harness for the big plug on the AF deck had some > > electrical tape, I unwrapped it and don't see any damaged wires, switches > > behind the front plate look clean, with no loose or broken wires. > > > > But it still makes noises when I gently tap around. I left it tuned to a > > nearby AM station and flipped the unit over, and it (kinda) came to life. > > Squealing, and awful sounding - tapping around with a screwdriver, > > primarily on the PTO seems to affect it the most. > > > > Anyone have experience with that? Here's a video.... > > > > https://photos.app.goo.gl/AZga9HyCqnJ1hyo18 > > > > On Fri, Oct 3, 2025 at 9:29 AM Jacques Fortin <[email protected]> > > wrote: > > > >> Hello Adam, > >> Swapping the tubes is a good idea, but that do not insure that the 1st > >> Xtal oscillator is actually working... > >> You should try to measure if there is any signal on the V401 plate. > >> This being said, I do not own a R-392, but it is similar to a R-390/URR > in > >> architecture. > >> Do you have a copy of the TM11-858 or the TM11-5820-334-35 ?? > >> > >> 73, Jacques, VE2JFE in Montreal > >> > >> -----Message d'origine----- > >> De : [email protected] <[email protected]> De > la > >> part de Adam Morehouse > >> Envoyé : 2 octobre 2025 13:59 > >> À : R-390 Mailing List <[email protected]> > >> Objet : Re: [R-390] R-392 > >> > >> Managed to get the V401/V203 tubes out with a little bit of gorilla tape > >> as a puller. The silicone puller I bought just slips right off them... > >> > >> I swapped tubes, no changes. The switch seems to be working fine, when I > >> first start playing with this thing, if I tapped the chassis it would > click > >> in the speaker, like a bad connection, etc. I took the bottom decks out, > >> and dropped the front panel and saw nothing obvious poking around. Now > that > >> it's back together, its gone. > >> > >> A lot of the tubes do test "low" on my Heathkit TT-1 tube tester (TV-7 > in > >> the pile of stuff to restore/calibrate). > >> > >> > >> V401 > >> > >> 1. -.3 / 118k > >> > >> 2. .01 / 8.4 > >> > >> 3. 5.8 / 6.2 > >> > >> 4. 11.38 / 10.3 > >> > >> 5. 21.9 / 1k > >> > >> 6. 21.9 / 1k > >> > >> 7. .013 / 8.4 > >> > >> V203 > >> > >> 1. 0 / 107k > >> > >> 2. 0 / 3.5k > >> > >> 3. 0 / .3 > >> > >> 4. 23.99 / 3.7 > >> > >> 5. 10.5v / 8.8M > >> > >> 6. .17 / OL > >> > >> 7. 23.15 / 2k > >> > >> > >> On Wed, Oct 1, 2025 at 8:08 PM Adam Morehouse <[email protected]> > >> wrote: > >> > >>> Hey guys, > >>> > >>> Doing a little tinkering between classes (18 credits is awful...). I > >>> decided to try out a R-392 that came with a T-195 I bought this summer. > >>> It's nice and clean inside, no obvious defects - but is completely > >>> dead below 8MHz. Any idea where I should start my search when I dig > into > >> this? > >>> > >>> Thanks for any help or pointers... > >>> > >>> Adam > >>> > >> ______________________________________________________________ > >> R-390 mailing list > >> Home: http://mailman.qth.net/mailman/listinfo/r-390 > >> Help: http://mailman.qth.net/mmfaq.htm > >> Post: mailto:[email protected] > >> > >> This list hosted by: http://www.qsl.net > >> Please help support this email list: http://www.qsl.net/donate.html > >> > >> > > ______________________________________________________________ > > R-390 mailing list > > Home: http://mailman.qth.net/mailman/listinfo/r-390 > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
