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

[Mack McCormick]

Larry,

Thank you.

73,

Mack
W4AX
https://www.qrz.com/db/W4AX


On Sat, Jul 17, 2021 at 1:35 AM Larry H <larry41gm at gmail.com> wrote:

> 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
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>