[R-390] R-392

[Renee K6FSB]

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 <jacques.f at videotron.ca>
> 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 : r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> De la
>> part de Adam Morehouse
>> Envoyé : 2 octobre 2025 13:59
>> À : R-390 Mailing List <r-390 at mailman.qth.net>
>> 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 <morehouse90 at gmail.com>
>> 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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