"MoiInAust" wrote in message
...

"Firebottle3" wrote in message
...
I found this on another forum. All I can say is WOW!!!!!

Thanks to the guys that put all of this information
together.

__________________________________________________ __________________________________________


Perry Sandeen has finalized a remarkable work on the
Hammarlund SP-600
and its many variants. This has been a long process with
input from
many different people who all had something to share on
this fine
receiver.

It is available for download (free) on the Hammarlund
Historian
website. It is in .pdf format and in two parts, each
being
approximately 7 megs.

Look he http://www.hammarlund.info/

I had an SP400 in the UK in the 1960's. I would to get one
again, or info about it...
I have a lot of exprience with the earlier SP-200, 210,
etc., series. I used a BC-779 as my station RX for a long
time. The SP-400 is essentially the same as the 40mhz
version of the 200 except that the frequency bands are wider
than 2:1. The 20mhz and 40mhz limit receivers are nearly
identical except that the RF stages in the higher frequency
model are shunt fed instead of series fed. That results in
slightly higher Q and slightly better RF selectivity.
I tried a lot of modifications in my RX but the only
one worth doing was adding a voltage regulator to the LO.
The rack versions came with overall shields which fit
over the entire chassis. These are not ventillated so the
set run _very_ hot with them. I put mine in a table rack
without the outer shield.
These are _very_ good receivers despite the old tubes
in the RF and converter section. They are very well shielded
so that there are very few spurs. Stability is adequate but
there is no temperature compensation (despit the fact that
Hammarlund used it in other receivers of the time) so you
have to run it continuously if it is to sit still.
Mostly you will not have to deal with the tuning box.
Its very complex and a bit of a Chinese puzzle. I have
cleaned one but don't remember all the details. Avoid
working on it unless there is a very good reason.

There are handbooks available on the web for nearly all
versions of the Super-Pro.



--
Richard Knoppow
Los Angeles
WB6KBL