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Pioneer SX-770

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

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Pioneer SX-770

Specifications

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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Reviews

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rating
Reviewed Dec 30th, 2018 by Platten-Spieler.de

its one of the finest Receivers I know!
Perfect design with strong metal-chassis and nice Macintosh look.
It is perfect to repair and/or to tune.
Since now, I have 5 items but collect them further...

rating
Reviewed Feb 20th, 2018 by lanceman25

I bought this from the previous owner in a Starbucks parking lot. It is in fantastic condition.

I paired it with a Technics TT SL-q2 and the receiver sounds amazing. Clear, warm, powerful, non fatiguing.

I have been enjoying this for weeks over a much more expensive/modern setup.

rating
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.

rating
Reviewed Apr 24th, 2016 by budulinek

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

 

Comments

re: SX-770

The Pioneer SX-770 had the best FM tuner I have ever owned in a receiver. Since it was the first receiver I ever owned, it spoiled me for all the tuners that came after it. Great sensitivity and ability to pull in stations without static and interference. I've always thought that there was something wrong with the FM tuners in every receiver I've purchased after that. But there was nothing wrong with the tuners, the SX-770 tuner was just that much better.

The SX-770 was seriously underpowered for the inefficient Acoustic Suspension loudspeakers that were prevalent in the early 1970's at 15 watts per channel. I've always wondered how it would perform with a more efficient ported speaker, but I upgraded to something with more power before I got the chance to find out. Also, I never heard anything but vinyl played through the SX-770 with a Dual turntable, inexpensive Shure cartridge, and Model 24 KLH speakers. I bought it in 1971 and replaced it by 1979, well before the arrival of cd's. I'd love to hear how it would sound today, linked to my current equipment!

re: SX-770

I have restored one of these for a friend that has some 93dB+ 1W/1M efficient speakers. It is overall a very warm and dynamic presentation. The stereo image is good, too. This one did require a tuner alignment (turning on AFC caused it to drift out of tune). It is very sensitive and selective for a 3 gang FM. Also, the 2SC870, 871's became noisy and required replacement.

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

Wilhelm

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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