[Hammarlund] SP-600 Chokes

[Al Parker]

Hi Gary,
    Check the resistance to ground of the winding.  It's possible that
it/they just were overheated, perhaps due to bad filter caps, or lots of
leaky BBOD's.  It isn't uncommon that they do get a short, or low
resistance at least, to ground, but you may be lucky.  There may be some
bad ones in a graveyard somewhere ;-)
    I had one that had been hot, as it looked scorched and the soldered
plug on top was melted out, but I checked it with a megger & it was OK at
500v.  It's back in service after repainting.
    The windings are 8.5 hy, 170 ohm, and 20 hy, 440 ohm, the lower being
the first one in line.
    I hesitate to mention it, but there is risky, VERY UNSAFE remedy if
one is shorted to ground.
  Pease note -- This should only be done as a "field expedient" if it's
necessary to keep the rcvr inoperation until a proper replacement can be
obtained.  The choke may be isolated from the chassis and left in
operation.  The case of it then is at B+ potential, not a good thing to be
around, even if it's covered with tape, etc.
73,
Al, W8UT
New Bern, NC
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----- Original Message ----- 
From: "Gary H. Harmon Jr." <gharmon at idworld.net>
To: "HAMMARLUND LIST" <hammarlund at mailman.qth.net>
Sent: Saturday, March 18, 2006 11:44 PM
Subject: [Hammarlund] SP-600 Chokes


> I had a SP-600 that needs one maybe both of the octagon chokes.  One
seems
> to have purged some if not all of its black yuck but the radio seemed to
be
> working the last time I turned it on.  Is this a common problem?  Is
there a
> graveyard for the chokes, etc?
>
> Thanks and 73, gary
>
> =========////////=========
> Gary H. Harmon, Jr. - K5JWK
> 6003 Archwood
> San Antonio, TX 78239-1504
> 210.657.1549 home
> 210.884.6926 cell
> gharmon at idworld.net
> "Veritas vos Liberabit"
>
>
>
>
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