[Hammarlund] Recapping my SP 600 JX17

[Al Parker]

Hi John,
    It's me again.
    Starting from the bottom and working back, maybe -- 
1.  The SX-28 is a bear to recap, partly because most of the resistors will 
be bad too, and so much disassembly is reqd.  I've done several of them, and 
many SP-600's, I'd much rather do the SP-600's.
2.  Use .01's, poly or disc ceramic, for all uses.  Some of us will use 
Orange Drops (or poly) for the few cases where the use is a coupling cap, 
like about 3 in the RF deck, none in the turret modules.  Hammarlund, about 
the time they realised BBOD's were what they are, went to 0.01 disc ceramics 
for all places where 0.01 or 0.022 was called for, and they noted that in a 
manual, the -JX-17 I think.
3.  Nothing is going to jump out and fly away whenever you unscrew any 
covers.  I'm sure the guy was talking about the curved, flat, spring clips, 
2 of which hold each turret module in place.  I find the best method of 
removal and replacement for them is to grab them in the center with a pair 
of curved hemostats and slide them out.  Easier done than said.  If you do 
happen to lose one or 2, Andy Moorer used to have some available, probably 
still does.
4.  Ray Vasek's article is prety much all encompassing on recapping.  It's 
been a few mo.s since I last read it, not sure if he covered the removal of 
the RF deck ( one of the manuals does), or the steel ball that can be lost 
from the main tuning cap tuning mechanism.  Or, not sure he recommends the 
removal of the side panels, one at a time, particularly the left one to get 
to the caps under the selectivity switch.
5.  Don't forget the ones in the "pod" on the side of the RF deck.  You'll 
have to drop the filter chokes and FCU to get to it.
    Hope that covers all you asked.  Let me know if there are any other 
stumpers.
73,
Al, W8UT
New Bern, NC
www.boatanchors.org
www.hammarlund.info

----- Original Message ----- 
From: "John King" <k5pgw at yahoo.com>
To: <Hammarlund at mailman.qth.net>
Sent: Monday, March 03, 2008 3:51 PM
Subject: [Hammarlund] Recapping my SP 600 JX17


>I call on my GREAT friend W8UT who always comes
> through with good answers to the often goofy questions
> I have.
>
> I have W2EC's article on recapping the SP 600 and have
> read it. My inquisitive "weak mind" still has a couple
> of questions.
>
> A ham friend in Texas WARNED me about springs on the
> turret and said that if I am not careful, the springs
> will get away from me and go flying into unobtanium. I
> have not removed the cover and am very leery of
> removing anything now. Those of you, who have redone
> the turret black beauties, may be able to give good
> advice and help prevent me from letting the "guts" fly
> out of my SP 600 JX17 receiver. If I lose parts, I
> might just have to junk it out and that would break my
> feeble heart. I have a heart that matches my brain.
>
> Another question is about capacitors. I know from the
> recapping article that some use disc ceramic and some
> use either or both .01 and .02 capacitors. I have a
> supply of fresh Xicon "yellow" caps which I believe to
> be poly  axial lead caps that are .01 mfd.@ 630 vdc.
> Is there a significant difference in practice  whether
> one uses "orange drops", disc ceramics or the "yellow"
> poly Xicon caps?????
>
> Your knowledge based on your training and actual
> electronic experience will be greatly appreciated.
>
> And also, will those of you who have recapped both
> Hallicrafters SX 28A and the SP 600 share your
> experience and knowledge with me as to how the degree
> of difficulty between the two receivers compare and
> whether either or BOTH will put me in the loony bin if
> I attempt to re-cap them. Thanks and 73, John, K5PGW
>
>
> 
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