"Richard Knoppow" wrote in message
m...
"moreradio" wrote in message
.. .
I'm the proud owner of a nice SP-600, unfortunately it is without tags,
can someone help me to identify wich version I have?
Here below some details:
-Non-mil radio no yellow anti-fungus varnish at all;
-Disc capacitors, no black beauty;
-The antenna connector looks to have been factory modified to an SO-239
style to accept coax cable;
-Crystal deck with crystals
-Dial lock
-Gray front panel, white letters engraved.
thank you
Claudio
This is not enough information. There is a great deal of information
on the web, do a Google search for sp 600 jx to find it.
There were more than twenty variations of the SP-600 made, most nearly
alike. The total production was on the order of 25,000 units. Your
description fits most of the receivers with exception of the VLF special,
the JX-17 (has two extra switches and three small red knobs) and those
made without the fixed frequency crystal unit. All have very similar
circuitry.
The receivers should have a name plate on top of the tuning capacitor
cover with serial number and version type on it. These are somtimes
missing.
The disc capacitors were used in receivers built after the mid fifties
but a great many earlier receivers built with Sprague Black Beauty caps
were modified due to the very high early failure rate of these caps. Also
many receivers were modified to have the SO-239 connector rather than the
balanced coax connector originally used. All of the JX-17s had these from
the factory.
I am pretty sure the anti-fungus treatment was applied after market
and not all receivers have it. Actually this is an advantage if you have
to work on the thing because the anti-fungus is very difficult to get off
and often glues things together.
At least one of the web sites has a list of versions although its not
quite complete.
--
Richard Knoppow
Los Angeles
WB6KBL
FWIW;
I have an SP600 with the JX17 designation on the the tuner cover.
It has the balanced coax antenna connector, and coverage from 540 kHz
to 54 mHz, and no red knobs. Of course, there's always the chance
of a swap of tuner covers...
Nelson