[Hammarlund] SP600 Antenna Input

[Alan Chandler]

While not a Hammarlund, I just recapped a 75A4.  All of the BBOD showed
about 2 ma of current with 250 volts across them.  ALL of them.  The testing
was done with a Sprague TO-6 capacitor testor.
73, Alan - K6RFK

-----Original Message-----
From: hammarlund-bounces at mailman.qth.net
[mailto:hammarlund-bounces at mailman.qth.net] On Behalf Of Wes Bolin
Sent: Monday, March 04, 2013 3:04 PM
To: anchor at ec.rr.com
Cc: hammarlund at mailman.qth.net
Subject: Re: [Hammarlund] SP600 Antenna Input

Hi Al
Thanks for the info. I do have a "Chinese" tester that says all of them have
more capacitance ie. .03 uF or so (new ones read very close to the correct
value).  None were split or leaking. This radio was kept in a pretty good
environment evidently, over the years.  At any rate the work will be worth
it in the long run to replace them all.
Good success to you,
Wes
 

________________________________
 From: Al Parker <anchor at ec.rr.com>
To: Wes Bolin <k5apl at yahoo.com>
Cc: "hammarlund at mailman.qth.net" <hammarlund at mailman.qth.net>
Sent: Monday, March 4, 2013 4:32 PM
Subject: Re: [Hammarlund] SP600  Antenna Input
  
hi Wes,
    I agree, getting some signal thru that connection is surprising.  Maybe
it'll hear much better after you get it right.
    But, on the BBOD's, don't take your VTVM's word for them being good. If
you put a little voltage across them, I'll guarantee you'll have a lot more
bad.  It just finds the shorted ones.  The 5 megohm one is bad, and really
any that measure any resistance at all probably are, too.  I have a AC
powered bench megger that I use to check caps, usually the BBOD's show maybe
5 megs at less 50 vdc, but much less than a meg at 250v & up.  I can go up
to about 800vdc on that tester.
    How many had splits in them?  I did an SP-600 RF deck a while back that
had about 15 with splits.
73,

Al, W8UT
http://www.boatanchors.org/
http://www.hammarlund.info/

"There is nothing -- absolutely nothing -- half so much worth doing as
simply messing about in boats"
Ratty, to Mole

On 3/4/2013 5:03 PM, Wes Bolin wrote:
> I am restoring my SP600 JX26 and just pulled the RF Deck for 
> re-capping.  J1, the antenna input jack, is a N-F connector (not 
> twinax).  Upon inspection of the RF compartment, both leads from Contact 5
and Contact 6 are going to the center pin of the RF connector!  Looks to me
like all the turret input coils would be shorted since the "usual" mod would
be to have one lead to center pin, and the other to ground.
> Even more puzzling is that the radio played very well before I started the
restoration.
> Any comments or ideas?
> FYI this radio had only one defective BBOD so far:  A .01 uF that is 
> open.  All other capacitors that I have replaced to date have between 
> 5 and
> 200 Meg ohms of resistance measured by my 11 Meg input V.T.V.M.  Now only
have 20 to go!
> Thanks,
> Wes
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