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Pioneer SX-770

Solid State AM/FM Stereo Receiver (1970-71)

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Pioneer SX-770


Tuning range: FM, MW

Power output: 15 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 40kHz

Total harmonic distortion: 0.8%

Damping factor: 35

Input sensitivity: 5mV (mic), 2.5mV (MM), 58mV (ceramic), 200mV (DIN), 200mV (line)

Signal to noise ratio: 80dB (MM), 95dB (line)

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 1 x FET, 31 x transistors, 23 x diodes

Dimensions: 430 x 145 x 349mm

Weight: 9.6kg


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Reviewed Oct 09th, 2017 by Sandutter

I hooked this one up with a pair of Paradigm Atom v.2 and a Marantz CD player. Then I listened to Herbie Mann's Hold on, I'm comin' in the dark, with a window open, letting the autumn chill fill the room. And I had one of the best musical experiences of my life. The live recording felt real, present. I was there with the audience, marvelling at the musicians fantastic skill. The Pioneer SX-770 gave me that experience. What a beautiful piece of technology.

Reviewed Apr 24th, 2016 by budulinek

Black Beauty with excellent FM Tuner. Sound warm and exact.



re: SX-770

Lamps are specified in the schematics.

Scale: 4 x 8V 300mA

Tuning Meter, AUX, Phono, AM, FM: 8V 150mA

Dial pointer: 8V 50mA


Pioneer SX-770

Nice manual but no mention of the fuse-like bulbs in the face plate. Anyone know the value of these bulbs?

fuse lamps

The fuse lamps that they use in dial face plates are usually 6v 250ma.. But the best way to know for sure is to meter the scocket... It should be AC... Mat Electronics sells 6v, 8v, and 12v fuse lamp.. You might also find them on e-bay... You can always put a high value lamp in a lower value application .. Like a 8v will work for a 6v supply and a 12v will work in a 8v supply.. The only thing is they will not be as bright as the originals... Also CHANGE all of the lamps because they will be mis-matched even if the voltage rating is right... You won't have a consistent light pattern.... So change them all..

PS also found the part # for the lamps in the O/S manual E22-017-0... That's if you want to try to track down the originals...

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