[R-390] R-392

[Adam Morehouse]

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
>