Sp-600 Audio Mods | Audio-Digital.net

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Hammarlund SP-600 Receiver Modifications

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.

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.

SP-600 Audio

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

SP-600 Audio. One of the design goals of earlier versions of the Hammarlund Super-Pro family was hi-fi audio capability to support critical monitoring and re-broadcast of programs. 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 …

Hammarlund SP-600 Enhanced Audio - ar88

http://www.skywaves.ar88.net/commrx/Hammarlumd/SP-600/SP-600%20Audio_Mod.pdf

Hammarlund SP-600 Enhanced Audio N3FRQ - 29 Nov 2003 Revised 23 April 2004 Low-frequency response of stock SP-600 rolls off at 200Hz. This mod will extend response to 20Hz. Negative feedback flattens response and reduces distortion. Overall gain is reduced by about 8dB. (This slows the AVC, preventing it from distorting low audio frequencies.)

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.

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