Adam
R-392 PTOs show up on eBay often. There two there now for $25 each + shipping.
I have seen them priced as low as $5 + shipping a year ago or so. I would
pull the PTO according to the manual and take a close look at it. The problem
could just be a loose wire, screw or bad coax or power connector. Who knows
what the dreaded previous owner did? <grin>
Regards,Jim
Logic: Method used to arrive at the wrong conclusion, with confidence. Murphy
On Saturday, October 4, 2025 at 03:15:59 PM CDT, Adam Morehouse
<[email protected]> wrote:
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
> >
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