Sp-600 Audio Modifications | Audio-Digital.net

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SP600 Audio Mods - AM Window

http://www.amwindow.org/tech/htm/sp600aud.htm

Quick and Dirty SP-600 Audio Modifications. by. Chuck Rippel, WA4HHG. Change C141 and C142 to 100 pF, polystyrene. Change C143 to a 0.01 uF, polystyrene. Change C148 to a 0.01 uF, polyester. Change C149 to a 10 uF, electrolytic. Change C151 to a 20-30 uF, electrolytic. Add a 0.01 uF, 630 V off the bottom of the primary of the output transformer to ground.

Hammarlund SP-600 Receiver Modifications - KevinChant.com

https://www.kevinchant.com/uploads/7/1/0/8/7108231/hammarlund_sp600_mods.pdf

Hammarlund SP-600 Receiver Modifications The 10 megohm resistors were added to provide for a slow discharge time constant which will be more effective on SSB reception. The 1nxx diode on the left ensures that when the RF gain control is reduced, thereby pulling the AGC line strongly negative, the new S-meter will not be pulled upscale.

SP-600 Rebuild

http://www.radioblvd.com/sp600_rebuild.htm

The standard SP-600 tunes from .54 to 54MC in six bands. A "J" suffix indicates JAN parts were used in the construction and an "X" suffix indicates a switchable crystal LO. Hammarlund also offered a "JLX" version with 100-400KC substituted for the .54-1.35MC band and a "VLF" version that covered 10KC-540KC.

Quick and Dirty SP-600 Audio Modifications

https://amfone.net/Amforum/index.php?topic=32891.0

SP-600 Rebuild Part2

https://radioblvd.com/sp600_rebuild_Part2.htm

Major Audio Modifications - The Argument Against 'em - The audio output on the SP-600 is communications-grade with the bass rolled off at about 3db down at 125 hz resulting in a noticeable lack of bass response. Just how much this absence of bass response bothers the user is certainly subjective but Hammarlund engineers had good reasons for the original audio …

SP-600 Audio - ar88

http://www.skywaves.ar88.net/commrx/Hammarlumd/SP-600/SP-600_Audio.html

Unfortunately, while the SP-600 retains a variable-selectivity IF that can be opened up to 12 KHz, the audio amplifier is rolled off below 200 Hz to improve voice intelligibity when narrow bandwidths are used. This had become standard practice in communications receivers.

Hammarlund SP-600 - Ominous Valve

http://www.ominous-valve.com/sp600.html

There are audio mods around that make small circuit and capacitance changes to restore the bottom octave of music, and/or add inverse feedback. It is said to sound great into an efficient, full-range, hi-fi speaker like the Altec 604. Only the very last SP-600 variant, the JX-21A, ever had a SSB product detector.

SP-600 DESIGNATION'S LIST - Hammarlund

http://www.hammarlund.info/sp600.html

The X-tal frequency control at the top r.h corner was removed and covered with a Buships/Northern Radio order no. nameplate. Northern Radio located in New York City made many modifications available for SP-600's such as an IF gain control located where the dial lock was normally located. This was a very common military modification.

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