![]() The Hammarlund Historian web page went offline a few years back. The military Technical Manuals for maintenance and alignment of this radio are available free on the internet. Designed specs for the SP-600 can only be achieved with an accurate IF and RF alignment. SP-600 is excellent for SSB and ECR reception but the radio must be properly operated for MANUAL (not AVC) reception and you must ride the RF gain manually. Nonetheless, the Band Change and Tuning knobs had to be properly set for best performance from the XTAL controlled frequencies. The delta change knob above the BFO knob adjusts XTAL frequency setting, not the BFO which is extremely accurate when correctly aligned. The XTAL positions 1-6 are each controlled by a crystal for individual and extremely accurate (for the day) frequency control of six specified frequencies. The crystal selectivity positions were intended primarily for CW and RTTY reception but they are very useful for tuning other signals as well. Opted for a better sealed meter rather than illumination. None of the SP-600 RF/AF meters were illuminated. Speaker audio from a stock SP-600 will not cut off if headphones are All Hammarlund SP-600s which include the letter "J" in the nomenclature were built to military specifications, whether they had a military contract tag or not. This is one of the best tube SW receivers ever built. In a Youtube comment user Willow Slough wrote: ![]()
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