Subject: Fw: Re: [Hammarlund] "new-be Questions"

Date: Mon, 13 Mar 2000 19:19:54 -0600

From: nfmk@juno.com

To: eengineer@erols.com



--------- Forwarded message ----------

From: Delibert3A@aol.com

To: ki6up@earthlink.net

Cc: hammarlund@qth.net

Date: Fri, 10 Dec 1999 20:48:32 EST

Subject: Re: [Hammarlund] "new-be Questions"

Message-ID: <0.8a632542.25830770@aol.com>



Welcome to the club!



Several suggestions:



Get issues #20, 21, 22 of Electric Radio magazine, for a series of three

articles called "Update that Super-Pro."  Topics include better

stability,

adding a detector for SSB, and better sensitivity.  (All back issues

available for $3.25 each (in the U.S.) from ER, 14643 County Road G,

Cortez,

Colorado, 81321-9575.)



W7FG Vintage Manuals has a manual designated "SP-600 Set" which is a

compilation of several documents covering operation, maintenance and

repair,

schematic, parts list, etc.  Check them out at www.w7fg.com.



Chuck Rippel has produced a 4-hour video on SP-600 repair, restoration

and

mods.  Available from the ER bookstore (same address as above) for

$89.95.



As to tube substitutions, I have had good luck using a 6GU5 in place of

the

first RF amp, for vastly improved signal-to-noise ratio.  Someone has

noted

that the original tube is a remote cutoff tube, while the 6GU5 is not;

but I

haven't had any problem with that.



You need to check whether your radio has the dreaded black tubular

capacitors.  There are many reports that these split and leak, degrading

the

performance of the receiver and (maybe?) creating a fire hazard.  General



consensus is that they all have to be replaced, which is not an easy job.



Some of the later receivers were made with disc ceramic capacitors

instead,

which is a great blessing if you have it.  (I don't have Rippel's video,

but

I understand he covers replacement.)



Finally, the folks on this website are very helpful if you run into a

particular problem.



Regards,

Art Delibert



---

Submissions hammarlund@qth.net



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