[Boatanchors] Re: [Collins] R-388

[WA5CAB at cs.com]

Larry,

Didn't you say your receiver is stamped MWO 11-264A-1?  If I didn't dream 
that, then (a) it's an R-388/URR and not a 51J-3 and (b) it was made on an order 
earlier than 25635-Phila-53, not on 37003-PC-62.  There must have been another 
MWO that added the antenna protection circuit.  But unfortunately my copies 
of DA PAM 310-4 skip from 1958 to 1966.  And by the time of the latter one, the 
AN/GRC-26A had disappeared from the list.  Or at least TM 11-264A was no 
longer listed.

In a message dated 8/10/2005 1:26:12 PM Central Daylight Time, 
telegrapher at att.net writes: 
> To back up, i have a 2nd R-388 manual that has a couple of change 
> notices in it.
> 
> TM 11-854/T.O. 31R1-2URR-121 C2 says:
> 
> The receivers procured on Order 25635-Phila-53 do not have a speaker 
> jack on the front panel.
> 
> Then a following note says:
> 
> On Order NO. 25635-Phila-53 the break-in Off-On switch replaces the 
> speaker jack on the front panel.
> 
> Another page more towards the front of the manual states:
> On order No. 37003-PC-62, Radio Receiver R-388/URR is provided with an 
> antenna protection circuit (Fig. 11.1)
> 
> The manual i have shows the circuit that is a relay driven by a 2N697 
> transistor.  There are other circuit component changes as well.
> 
> got to digging thru the two 388 manuals to see where i had seen this 
> info.  SO now at least i can partially date the receiver.  Just don't 
> know what set of serial numbers may have been affected by the 
> 37003-PC-62 or were included in the 25635-Phila-53 order number.
> 

Robert & Susan Downs - Houston
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