[Boatanchors] R-388?

[Al Parker]

Hi Phil,
    The R-388's are very nice rcvrs, tho' not as easy to cruise with as an
SP-600, but at least you do know just where you are.
    I've "done" 2 of them in the last 6 mo.s or so, one of mine and one
for a friend.  The only capacitors that I've found to be worrisome are the
HV filters (plug-in), some of the bathtubs, and a mica, C-204, the
coupling cap from V-110 to the AGC ckt.  2 other guys have had problems
with it also, so take a look.  It may be the sensitivity problem.  I've
been into several Collins PTO's, usually they've had "vitamin Q's" (or is
it D?) as bypasses, and didn't really need replacement, but I did anyway.
The span fix isn't hard, and the feedback cap should be replaced.  Your
500kc xtal in the phasing can is probably bad, mine was, and I'm still
looking for a replacement, as I borrowed one from another rcvr.
    You can take a look at the ones I've done, start at:
http://www.thecompendium.net/radio/R388sn58.htm
    I sold this rcvr a week ago to a collector who really only wanted the
cabinet, and the rcvr then showed up on ebay.
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info

----- Original Message ----- 
From: "Philip Atchley" <beaconeer at sbcglobal.net>
To: <boatanchors at mailman.qth.net>
Sent: Tuesday, July 26, 2005 2:46 PM
Subject: [Boatanchors] R-388?


> Hi,
>
> There is a Collins R-388 sitting in the floor awaiting service.  A quick
check
> of it (after forming the capacitors) disclosed the following, no real
> surprises here.
>
> 1.  Sensitivity seems quite low. (I tested the tubes, all tested good).
> 2.  PTO end points/linearity are out quite a bit, apparently "normal"
for this
> set.
> 3.  The Xtal filter doesn't seem to work.  Changing the position of the
Xtal
> filter selectivity switch has no real effect.
>
> It doesn't have any BBODs (black or brown), but seems to have a lot of
long
> skinny brown capacitors that appear to be some sort of ceramic.  I
haven't
> really seen this style much before, they don't look like the typical
"white"
> dog-bones that I've seen elsewhere.
>
> Ideas, hints?
>
> 73 de Phil,  KO6BB
> SWL QSL GALLERY: http://photobucket.com/albums/y123/KO6BB/
> THE BEACONEER'S LAIR:    http://www.geocities.com/ko6bb/
> Merced, Central California, 37.3N  120.48W  CM97sh
>
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