[R-390] R-390a Solid State Conversion

[Larry H]

Nice work, Mack.  I like the plug in circuit board approach that you took.
Great pictures.

Regards, Larry

On Wed, Jul 14, 2021 at 9:29 AM Mack McCormick <w4ax.mack at gmail.com> wrote:

> This list has helped me immensely over many years and I’d like to share my
> latest project to covert a R-390a to Solid State. First, this design
> belongs completely to Charles Smith, KV4JT. I saw his conversion video on
> YouTube and it looked like a fun project. Charles and I correspond
> frequently with my lessons learned during the conversion and his continued
> improvements.  There have been two major revisions after the original
> video.
>
> Also, I tend to be a purist with vintage restoration and never make
> permanent modifications to the original designs. I have seven R-390a’s,
> R-390, and R-391 in the shack. All loving restored to original design.
>
> The changes made to this solid state conversion are all reversible if
> desired. This rig started with a basket case parts radio that I paid $25
> for. I took parts/modules from other parts radios I own.  It was a fun
> project and I took a different approach by designing Tubelet boards and
> tube bases as replacements.
>
> It works exceptionally well in A/B swaps with a blueprinted R-390a. The
> test equipment specs are great.
>
> Anyway, sorry for the long introduction but here are some photos of my
> conversion for you to review.
> https://photos.app.goo.gl/11AjyNCi2zV3T8LaA  You may also want to watch
> Charles’ videos on YouTube. The conversion documents he sells for a very
> modest price are superior.
>
>
> Vy 73,
>
> Mack
> W4AX
> --
>
> 73,
>
> Mack
> W4AX
> https://www.qrz.com/db/W4AX
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