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October 14th 06, 05:01 AM
posted to rec.radio.amateur.boatanchors
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HAMMARLUND SP-400 Receiver
"Harold" wrote in message ups.com... Richard Knoppow wrote: "North Lake Audio" wrote in message ... Sold from 1946 * 1948. Good condition. http://cgi.ebay.com/ws/eBayISAPI.dll...9134&ssPa geN ame=STRK:MESE:IT&ih=005 Thanks, Steve This is NOT a Super-Pro 400, it is an earlier receiver, looks like military surplus SP-200. The exact model depends on the frequency range. The missing label on the front was the military identifier. Three frequency ranges were offered 535KC to 20Mc (standard) 1250 KC to 40 Mc, and a version covering 100kc to 400Kc on the two lower bands and 2.5 mc to 20Mc on the upper three. There is a fair amount of material on the web which will alow identifying the particular model. If the original bottom cover is present it may have a schematic diagram pasted to the inside which will also identify the model. A large number of these receivers were built under contract by Howard Radio Co. The SP-200 series was replace by the SP-400 in 1946. The SP-400 has continuous coverage from 535Khz to 32Mhz. In addition, the band indication is engraved or printed on the front panel rather than on the skirt of the bandswitch knob. I wonder if the power supply is around someplace. They are not impossible to build but the original would be nice. Most military receivers came with rack mount supplies. -- --- Richard Knoppow Los Angeles, CA, USA The SP-400-X coverage was from 540 kc to 30 mc. The SP-400-SX covered 1250 kc to 40 mc. Those were the only two variants. But, you are correct on the bandswitch and panel engravings. Just wanted to set the record straight. H. State I've never seen an SP-400-SX, there certainly was an SP-200 with this coverage. It differed from the others in having shunt-fed RF plate coils rather than series fed. This resulted in somewhat sharper tuning of the RF stages and lower image response. I am not sure if the same arrangement was used for either SP-400 models. These are still very respectable receivers. -- --- Richard Knoppow Los Angeles, CA, USA |
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