[Hammarlund] Hammarlund chokes in SP-600

[Al Parker]

Hi Bob,
     The SP-600 s-mtrs are not very active.  But, before you go digging 
too far, operate the meter switch a dozen or 3 times, quickly.  It's a 
hi-impedance ckt, and switch contacts don't clean themselves very well.  
(and/or shoot some DeOxit into it) The rectifier is only in it's ckt for 
the audio measurement.  The AVC/MAN switch is similar, can develop 
resistance across it's contacts..
     Leaky p.s. chokes will usually blow fuses, like's been said, it 
doesn't happen very often, I think I've seen it in 2 SP-600's that have 
come thru here, and that's over maybe 3 dozen.  Maybe that is often, I 
dunno, but they usually come thru hr cuz they need help, not cuz they're 
in FB shape.
     If you, or anybody, want a good account of what's involved in 
totally recapping an S-600, there's a good article written by Ray Vasek, 
W2EC, in the svc secn of the Hammarlund Historian website. 
<http://www.hammarlund.info/SP600svc.htm> We're getting that site back 
together slowly.
73,
Al, W8UT
New Bern, NC
www.boatanchors.org
www.hammarlund.info

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


On 3/10/2010 2:36 PM, rbethman wrote:
> I've chased down two chokes.  They come off the transformer output,
> taking off from the input to the rectifier.  They are in series, not
> counting the capacitors that are before, between, and after.  They in
> turn feed the 0A2 regulator.
>
> In the J-11, they are L51 and L52.  The 0A2 is V-18.
>
> I can only surmise that I have no problems.  I base this on having left
> it on and running for a week or weeks at a time.
>
> The only problem I've developed, is the S-Meter.  I won't go into what
> "seems" to be the originating cause.  It was a dumb moment!  The
> movement works when I apply a voltage across the meter.  I've checked
> the meter rectifier tube, and went ahead and put in another just to be sure.
>
> I guess I really need to take it out of the rack, and trace through
> carefully and see what the bloody devil is happening.
>
> Bob - N0DGN
>    

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