[Boatanchors] Re: R-388

[anchor at ec.rr.com]

Hi Larry,
  I also have some of that same info.  I've owned several R-388/51J-
3's, and have put some of my refurb info on my website, but haven't 
really put together the kind of thing that'd answer your questions.  
Gathering it all together in some ordered fashion would be a good 
project, if I can add to it I'd be glad to, and can make space 
specifically for it on my website.
  Here's a spot to start looking at what I've got:
http://www.thecompendium.net/radio/R388sn58.htm

  Right now my ISP is having big problems, and has had for a few days, 
no real time of fix stated yet.  Occasionally some mail comes in, 
occasionally I can send out, particularly if I sign in to their website 
as if I was away from home.  So, I may not see any replies for a while, 
if ever. pse keep trying.
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info


----- Original Message -----
From: telegrapher at att.net
Date: Wednesday, August 10, 2005 2:25 pm
Subject: [Boatanchors] Re: [Collins] R-388

> Here's some info i dug out of the R-388 manual i obtained from 
> Robert 
> Downs last week for review by all who have assisted with comments 
> on my 
> questions.  Additional info at the bottom by Gerald of Collins 
> fame and 
> fortune.
> 
> As you can see i've kind of left a couple of questions unanswered.
> 
> 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.
> 
> My J-3 has a break-in switch in place of the speaker jack that 
> previously was in that hole.  It also appears to have the relay 
> for 
> antenna protection mounted under the chassis at the rear near the 
> antenna connector.
> 
> Does anyone have any data, kind of like the 390 group as to how 
> many 
> different 51J types were built, contract dates and serial number 
> ranges? 
>  Would it be correct in saying that these were all Collins built 
> radios?
> I have a Sams Photofact folder for the 51J-3 but it shows nothing 
> other 
> than component placement, alignment data and schematic basically.  
> The 
> date on it is 12-54.  Both the speaker and headphone jacks are in 
> place.
> Fun isn't it when some dummy asks a question like this!  Any and 
> all 
> input is really appreciated.  Maybe i can put something together 
> and put 
> it on the list sometime in the future as i do not have a personal 
> web 
> page arrangement.
> 
> Larry
> W0OGH
> 
> 
> 
> Gerald wrote:
> 
> > On Mon, 2005-08-08 at 19:35 -0700, telegrapher at att.net wrote:
> > 
> >>Interesting situation.
> >>
> >>Thanks
> >>
> >>Larry
> >>W0OGH
> > 
> > If there are other differences, they aren't great. Some have a 
> standby> switch in place of the front panel headphone jack. I 
> haven't traced that
> > circuit through mine or detected how it works yet.
> > 
> > Mine has a gray panel and a round emblem where the name tag 
> should be,
> > yet inside there's a pencil note showing an early serial number 
> R388.> 
> > It also has a product detector mod done very neatly and the AGC 
> mod made
> > very tentatively. Both work well.
> > 
> 
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