[Hammarlund] SP-600 First report, HC-10 question.

[Al Parker]

Hi again Phil,
    Congrats on your latest find.  The HC-10 is a great addition to the
SP-600.
    Just thought I'd point out, again, to you & others, that there's a
"service" section on The Hammarlund Historian website, it includes Ray
Vasek's great article on recapping the SP-600.  Not there yet, but on my
site, is some info on re-doing the front panel.  It's not a hard job, and
can really make them look like new.  I also show one hooked up with an
SPC-10, just use the IF out jack.  I think the HC-10 manual shows the hookup
with an adapter to rcvrs that don't have that jack.
    I don't think you mentioned if you were one of the lucky ones to get one
with no BBOD's.  If so, the work is greatly reduced.
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info

----- Original Message -----
From: "Phil Atchley" <k06bb@elite.net>
To: <hammarlund@mailman.qth.net>
Sent: Sunday, June 01, 2003 11:43 PM
Subject: [Hammarlund] SP-600 First report, HC-10 question.


> Hi.
> That SP600 JX17 and HC-10 showed up at my QTH early this afternoon.  This
is
> about the 4th SP-600 I've had over the past few years.  Needless to say,
> I've been a busy little beaver all afternoon 8^)  It seems that all my BA
> "projects" arrive in the summertime instead of the winter like normal
folks.
> What's wrong with this picture?
>
> Anyway, as the man told me before he came down, it'd be a "project" as it
> needed some things done before it could be powered up.  He was right.
While
> it wasn't badly "hacked", The leads to all the toggle switches had been
> clipped at the switches, 5 tubes (2x 6BA6 and 2x 6C4, 5R4) were missing,
> though the shields were there.  He brought me a 5R4 as he'd seen it was
out.
> I checked my junkbox and I have the others in it.
>
> Apparently the man he'd "rescued" it from had intended to do a
restoration,
> including replacing the toggles and pulling the front panel but ran into
> problems getting a couple knobs off.  After a great deal of struggling I
got
> the knobs off, pulled the panel and thoroughly cleaned the tuning
mechanism
> and dials.  The dials looked nice but had a film of dirt.  A damp rag with
> NO SOAP OR SOLVENTS brought both dials up to looking like new.  Whatever
was
> on them wasn't hard to get off.  What was a VERY sluggish and slipping
> tuning mechanism now spins like an SP-600 dial should!  I installed brand
> new toggle switches from my parts stock for all but the meter switch.
Yes,
> they're Radio shack units but I still trust em more than 50 year old
> switches! Reinstalled the front panel, knobs etc and quit for the day!
>
> Tomorrow I'll test all tubes, check/clean the turret switches etc, then
make
> a temporary silicon diode plug-in so that I can slowly bring the unit up
to
> form the caps, see if the filters are any good and temporally usable.  If
it
> comes to life I'll do some further testing.
>
> XTAL NOTE:  The man I got this unit from said that the 3.5MHz Xtal was
> missing from the unit.  First thing I did after he left was pull the cover
> and take a "peek" inside.  The 3.5MHz Xtal IS there and doesn't look like
> it's been messed with!  However, that doesn't mean it's any good, but one
> can hope.  The 6C4 tube that works with it was missing, hmmm, I wonder?
>
> The ONLY modification that I can see has been done to the unit is the Dial
> lock removed and an IF gain pot installed there. Anyone else seen this mod
> anywhere?
>
> So far I feel quite good about this set, it's definitely in overall better
> shape than some I've seen, though the panel isn't as "beautiful" as some
> I've seen.  At least all the correct knobs are there, though I DO need to
> get a knob for the IF gain mod.  Hmm, I wonder, red or black ;-)
>
> Power connection.  As with others on the list I see I too don't have the
> proper cord.  For temp use while working/troubleshooting I'm considering
> making a cord by taking a couple pins from an old octal tube socket and
> putting them on a 3 wire cord for "push on" connectors.  Insulate it and
> Anchor the cord such that it couldn't pull out and become a safety hazard.
>
> NOW THE HC-10 QUESTION:  The manual shows a tube socket adapter to connect
> it to the last IF amplifier of the tube. I could make one of these ok but
> can it be connected directly to an IF output jack of a receiver that has
> one?  My homebrewed Beacon receiver with 455 KHz IF has a jack I put on
it.
> I see from the schematic that the input ties directly to the notch filter.
> Would connecting direct affect the notch operation?
>
> 73 de Phil, KO6BB
> DX begins at the noise floor!
> k06bb@elite.net
> Merced, California
> 37.18N  120.29W  CM97sh
>