[R-390] Special Purpose R-390

[Roger Ruszkowski]

Fellows,

The name plate is not mil spec.
Cool but not government.

Cool knobs.

Are they locking knobs?

That is an R390A 
Are there any internal mods?

How about a pictures of  the back panel, top side looking in and bottom.
Can you fellows help me guess what in this box on my deck?


Roger Ai4NI


-----Original Message-----
From: Don Kammer <norad2240 at gmail.com>
To: Charles Steinmetz <csteinmetz at yandex.com>
Cc: 390 list <r-390 at mailman.qth.net>
Sent: Tue, Feb 18, 2014 6:58 am
Subject: Re: [R-390] Special Purpose R-390


I agree with you about the knobs.  I noticed them immediately and was
convinced they were either cosmetic or were put there as one piece each to
provide a significantly better grip, such as would be provided to a bicycle
chain.

The plate is another matter.  I think the plate was a stamped template
applied to both flavors of the R390, regardless of who actually built
them.  Yes, we know this beautiful child originally came from Collins, but
I think that any company referring to itself as Clark "Instruments" would
have some sort of inkling for the difference between an R390 and an
R390-A!  Thus, it may or may not be a Collins based on their idea that "one
size fits all" with their cavalier plate application stating that it's
either/or...!

Counting down to next Monday - 02/24!!!

Don Kammer


On Tue, Feb 18, 2014 at 11:06 AM, Charles Steinmetz
<csteinmetz at yandex.com>wrote:

> Don wrote:
>
>  From what I can read (and interpolate), I believe I'm seeing the
>> following:
>>
>> RECEIVER SPECIAL PURPOSE
>> Type:  .5 TO 32 ...
>> Modified by Clark Instruments
>> Original Type Receiver ...
>> COLLINS RADIO COMPANY
>>
>
>
> I looked at various magnifications and with a few filters and think I was
> able to decipher a bit more.
>
> Carets (^) indicate unidentified characters:
>
> RECEIVER SPECIAL PURPOSE
> Type  .5 TO 32 MCS ^^^^^^
> Modified by Clark Instruments
> Original Type Receiver 390 OR 390A URR
> COLLINS RADIO COMPANY
>
> The only difference I see on the front panel is the MC and KC knobs.  They
> give the impression that there are separate "inner" and "outer"
> adjustments, but that could just be cosmetic.
>
> Best regards,
>
> Charles
>
>
>
>
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