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November 1st 09, 11:36 PM
posted to rec.radio.amateur.boatanchors
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Hammarlund SP-600, help me to identify which version is...
"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 |
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