If it works above 8 mhz then probably not the pto (V801) or 2nd mixer
since it is the same for all segments, 8 and below switch issues since
another converter is inserted containing more ,crystals see TM-11-58
(1954) pg 49-50 ( pg 62 in pdf) fig 25 for the block dia and pg 57 (pdf
pg 69-70) section 57 for description.
this functions similar to R390s
triple conversion 8 and down, double 9 up which bypasses this
converter/mixer using the 2nd mixer and pto
i think you have a switch issue- mechanical,-could be alignment of
contacts / dirt/ contact tension, etc....depending on the mechanical
could be in the second mixer contacts/alignment again physical
Renée
On 10/4/25 1:14 PM, Adam Morehouse 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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