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Hi, everyone,
I picked up a (low end) Heathkit short wave transistorized radio, model SW-717, "series no" 08731, at a garage sale this W/E - not working well, some reception on BC bands but low sensitivity. I put a few low level sig. gen. RF signals on the antenna terminal, from 1 MHz to about 12 MHz but reception spotty and not to dial scale. My guess is that it is 1970's vintage, perhaps a bit before. It has 9 transistors (2 power types); no integrated circuits; cannot find any IFT's (very odd!) but there are a total of 7 unshielded coils on the PCB. It has a 2 gang tuning capacitor with one gang of lower capacitance than the other with 10 plates vs. 11, about 390/500 pF in size - suggests an oscillator to me, i.e. not a TRF set. I've not yet done a full forensics yet in case I can save time by looking at the schematic. Will pay for copying and mailing costs for a manual, or the original, or would appreciate even just a scan of schematic by email to: 'surfnews "at" sprint "dot" ca' suitably written, of course.. All info on this model will be greatly appreciated. Many thanks for all replies, Cheers, Roger |
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