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Pioneer SX-626

AM/FM Stereo Receiver (1972-74)

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Pioneer SX-626

Description

A medium-powered stereo receiver with up to 110 watts of music power, low-noise FET, and high sensitivity FM tuner section.

The SX-626 stereo receiver is one of Pioneer's great stereo values. In one attractive, well-designed package, it offers the hi-fi enthusiast everything he could possibly desire in a medium-range power unit.

Including up to 110 watts of power (at 4 ohms), an FM tuner section of excellent selectivity and sensitivity, high signal-to-noise ratio, and two tape monitor circuits that permits tape-to-tape duplicating.

The SX-626 is powerful enough to operate a pair of large speakers, yet it's also versatile enough to handle small- and medium-range speakers for the man who's investment in stereo must be budgeted.

Specifications

Tuning range: FM, MW

Power output: 20 watts per channel into 8Ω (stereo)

Frequency response: 5Hz to 80kHz

Total harmonic distortion: 1%

Damping factor: 40

Input sensitivity: 2.2mV (mic), 2.5mV (MM), 200mV (DIN), 200mV (line)

Signal to noise ratio: 85dB (MM), 95dB (line)

Output: 200mV (line), 35mV (DIN)

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 4 x FET, 4 x IC, 41 x transistors, 22 x diodes

Dimensions: 450 x 145 x 360mm

Weight: 9.9kg

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Reviews

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rating
Reviewed Oct 25th, 2014 by letterbox_wind

Received one of these free from our local recyclers...it had been thrown into two dumpsters at various times, so its wooden cabinet was not at all pretty any more. But plugged it in, powered it up, and except for one dark dial lamp, it is 100% on task! Who built these things, I wonder? ;)

rating
Reviewed Oct 22nd, 2014 by guest

Excelente seccià³n de AM, esplendida construccià³n, se puede mejorar el desempeà±o sustituyendo el capacitor principal por uno de 6800 uF X 63 Volts, sonido de primera.

rating
Reviewed Sep 28th, 2014 by Regenpak

For its time a worthy receiver. Recapped the unit, but it wasn't really necessary. Single rail power supply is well suited for its task. FM reception is excellent. Lacking is a center meter, which I kludged in with LEDs and opamps. Signal level meter was pretty much useless. With extra diodes managed more logarhythmic response. Also replaced the tuning dial lamps with blue LEDs. The result is absolutely stunning! See gallery images.

 

Comments

re: SX-626

I received a Pioneer SX 626 as a Christmas gift from my parents in 1971. I was 16 and just starting to get interested in high fidelity sound equipment, and I let my parents know of my interest. They were very generous, making this (at the time) $300 receiver my “big gift”. I was so excited, but had nothing worthy to connect it to. I settled for a set of cheapie speakers with 4 and 1/2 inch duo cones, then a pair of Radio Shack Nova 7’s, and finally at 18 getting a pair of Advent loudspeakers. A second-hand Sony reel-to-reel tape deck and Garrard turntable finished my system. For several years, I thought I was riding high! By my early 20’s, I had heard enough other systems to know that my system was OK for a single room but was not going to really rock out at a party. My apartment was robbed and about all I had of value was my stereo system. I eventually bought another system with a 50 watt Pioneer receiver and Jensen loudspeakers and a few other items, and by my mid-30’s I moved up to a Sony receiver (STR AV720) with 80 watts per channel — I still have the Sony, Jensen speakers and some other old gear and it still sounds good to me. I have thus far resisted the temptation to purchase a modern AV receiver with built-in WiFi, Bluetooth and HDMI’s. I read that audiophiles judge the old stereo equipment to have superior sound to the new AV receivers.

If I still had the 626, I probably wouldn’t play it much, as it was sounding a bit “muddy” to me and underpowered. I would correct the information listed above: The power rated for the 626 was actually 27 watts RMS per channel, not 20. I see that some 626’s are now selling for $400-500. Meanwhile, my Sony would only fetch about $100, give or take. Imagine that.

re: SX-626

I found my SX-626 through a local FB trader page. It was being used as a shop stereo amp in an auto body garage and had layers of paint dust and grime on it. After spending a bunch of time cleaning the vinyl, aluminum and silver surfaces, and getting all of the dust out of the circuits, I hooked it up to an antenna and speakers. I was amazed that after that much abuse, the unit sounds extremely clear and balanced; pulling in stations more than 15 miles away with a 4+ on the signal meter. Four of the dial lamps were blown and the “STEREO” indicator bulb wouldn’t light, but an easy replacement and upgrade to LED’s resulted in a beautiful crisp display to match the clarity of the sound. The SX-626 is a compact receiver worth hunting down. It’s a tough performer that testifies to the Pioneer build quality of the 1970’s.

re: SX-626

I have one that was found for me by a friend that was dirty, it had some completely open electrolytic caps and (mine has the IC tuner) and a bad solder joint on the tuning cap, the bias pots were open, and an output transistor was shorted. I fully restored it. I don't listen to music loud, so it's plenty of power. Having worked in high end audio manufacturing and having some quite high end equipment come through my living room, the SX-626 still remains one of my favorite things.

(having restored and repaired several old Pioneer amplifiers and receivers, I'll give this warning: those white 50 or 100 ohm bias pots like in the SX-626 are trouble, I've seen more bad than good. If they open, the output transistors and possibly more will be destroyed, especially if the wrong fuses are installed)

TubesGalore's picture

re: SX-626

Excellent receiver for those that don't need a monster flame throwing 150wpc (watts for channel) receiver. Bought mine on eBay cheap. Had to replace the dial pointer lamp. Also replaced the dial lamps with LEDs and as another poster said: AWESOME! Thought about re-capping it but all the capacitors were quality ones and since the unit sounded good I didn't. There was a power filter cap that was leaking so that got replaced. All the other caps looked good with no residue on the pcb (printed circuit board). Highly recommended unit.

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