![]() It was over a year later, in 1950, that Hammarlund introduced the SP-600 Series and. The SP-600 requires an external loadspeaker. No SPC-600X receivers were ever created other than maybe a prototype or two. Many models were custom ordered for military or naval duties. This was also the only SP-600 with a SSB product detector.įrom the outside, most versions look quite similar, but circuit modifications where made throughout its lifetime. ![]() The last SP-600 was the SP-600 JX-21A which was in production until 1972. Most versions have a frequency range as stated above, but there were some exceptions. ![]() As many as 40 (!) different SP-600 versions have been manufactured.
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