[Collins] Late 51J-4 with strange modification

[asmagal at fc.up.pt]

Greetings!

Around 1962/1963 an intelligence service where I have been working
for a while, bought a lot of 51J4 receivers, probably more than half
one hundred, and as far as I can remember, all of them come from
Collins with the S-line buttons.

73, Antonio,CT1TE.

Quoting Gerald <geraldj at ispwest.com>:

> On Sun, 2005-08-21 at 13:02 -0500, Mac McCullough wrote:
>> Indeed I have had several of these,   and this seems to have been a version
>> made up for a specific customer is my guess,  but yes I have seen and owned
>> several of these ..  although non had or came with a cabinet .  mac/mc
>>
> The knob swap could have easily been done by anyone with enough S-line
> knobs. Those knobs were readily available within Collins and at Collins
> Surplus store in Cedar Rapids during the early 60s. Much of the Collins
> surplus stock was sold in bulk to W0MLY and later to Surplus Sales of
> NE. All the shafts are standard 1/4" using set screws so any style
> including stock mil spec or consumer radio knobs could be applied and
> they would function.
>
> As far as I know the serial numbers should have been sequential so the
> serial number should have shown the manufacture date or era.
>
> I have a 51J-3/R388 with a light gray smooth panel, the labels are all
> engraved except the standby switch label. It has no SN tag, but has a
> large round Collins Emblem at that location. There's an early R388 SN
> penciled on the chassis rear or the cover. I don't know if this is a
> Collins variation or later. Though I'd kind of expect the standby switch
> to have been engraved if the panel was modified at the factory.
>
> I recall seeing mostly 51J receivers in the labs and production at Cedar
> Rapids in 1963-4. The 51S-1 I saw in 1964 was at Richardson. Its
> conceivable that receivers may have been redecorated when used in test
> equipment racks so they matched the other custom test equipment.
> --
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
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