AM/FM Stereo Receiver (1974-76)
The SX-737 is a high-quality stereo receiver featuring 35 watts per channel, min RMS at 8 ohms from 20 Hertz to 20,000 Hertz with no more than 0.5% total harmonic distortion.
It has the power to do the job - not too much and not too little.
Pioneer's medium-powered SX-737 stereo receiver doesn't waste watts, yet it gives you the latest state-of-the-art advantages for versatility and true high fidelity performance.
The FM front end is equipped with a frequency-linear 4-gang variable capacitor and dual-gate MOS FET.
New dimension in FM reception stability is assured by its multiplex demodulator with the revolutionary PLL (Phase Lock Loop) circuit, while the FM IF section is equally advanced with its 5-stage limiter and phase-linear ceramic filters.
The results in FM performance are impressive: 1.9pV (IHF) sensitivity: better than 60dB selectivity: capture ratio of 1.0dB (IHF); and stereo separation of more than 30dB over the 50 to 10.000Hz range.
Accurate high fidelity reproduction of all sounds is achieved by using a particularly precise phono equalizer in the Pioneer SX-737 - it keeps RIAA deviation within ±0.3dB.
As a stereo control center the SX-737 is hard to beat - there are two stereo pairs of tape deck connections with monitoring and tape-to-tape duplication facilities (deck 1, deck 2), a function switch to allow control of the FM and AM tuner sections, a stereo Phono, a microphone and a stereo AUX.
As a bonus, and a feature you'll appreciate all the more with use, there is a unique Recording Selector to permit you to record FM broadcasts while listening to disc reproduction and vice versa. This receiver does the job.
Tuning range: FM, MW
Power output: 35 watts per channel into 8Ω (stereo)
Frequency response: 15Hz to 40kHz
Total harmonic distortion: 0.5%
Damping factor: 40
Input sensitivity: 2.5mV (mic), 2.5mV (MM), 150mV (DIN), 150mV (line)
Signal to noise ratio: 65dB (mic), 70dB (MM), 95dB (line)
Output: 150mV (line), 30mV (DIN)
Speaker load impedance: 4Ω (minimum)
Semiconductors: 1 x FET, 3 x IC, 46 x transistors, 22 x diodes
Dimensions: 500 x 158 x 410mm
Accessories: FM T-type antenna
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Reviewed Jul 08th, 2016 by sp10
I recently bought one these beautiful receivers, as it was it sounded very clean and comfortable.
However it was in bad need of a complete service, so I stripped it down and cleaned all the switches and controls and the speaker relay.
I then set about replacing the capacitors in various sections with polypropylene, Elna Silmic11 and Panasonic FG types
First stage was the regulator board, there are two transistors on here both run red hot, one has a tiny heat sink and the other nothing.
I put a larger heat sink on one and put a heat sink on the one that had nothing, despite these transistors running red hot there was no scorching to the board or dry joints.
The caps I replaced with Panasonic FG types.
The Phono stage I did with polypropylene input and output caps and Panasonics for the decoupling caps.
The control amplifier I used Elna Silmic11 caps in the audio sections and FG’s for the decoupling
I replaced the Tuner output caps with Nichicon gold caps and decoupling with Panasonic FG’s.
The input to the power amplifier was done with polypropylene caps and the rest with Panasonic FG’s.
The result a very mellow and inviting sound that is a pleasure to listen to.
There is an error in the service manual regarding the pre-sets to adjust for DC-offset and Idling current adjustment, they are round the wrong way, VR-3/4 are DC Offset adjuster and VR1/2 are the idling current adjusters
Reviewed Mar 25th, 2015 by eugenio731
Old school watts!
Very powerful for it's stated output.
Will drive virtually any speaker to listening levels that are comfortable.
Reviewed Feb 11th, 2015 by kjasey
I think its important to start off by telling you I just got into buying vintage receivers. I've always liked the look of them and thought maybe ill just buy one for my bedroom. I wanted to give it a test run in my living room first. This is where I have my Marantz 5 channel 175 watts discrete..also known as the mm9000. Im using a Pioneer elite 53 as my prepro. So I disconnected my speaker wires and hooked them up to my Pioneer sx 737. I didn't realize that in the next 5 minutes...all the things that I believed in audiophile world be changed for life. I was shell shocked when I heard this pioneer pump out the first Billy Joel song on his greatest hits cd. I was like..you got to be kidding me....Its like I finally know what true audiophile sound, sounds like. The detail and the punchy bass was incredibly. I had goose bumps. Speechless song after song. The detail is so incredible that I had to double check certain cds...because there was static. I thought the receiver had a bad transistor or something...but no...it was picking up cd artifacts. Crazy! Lets talk about the strong points of this receiver. Strong tight bass, clear, accurate, warm sound...The midrange is so incredible, very pronounced..you'll hear ever word. Im using Energy RC 30s. They never sounded so incredible. I think its a match made in heaven. I have a collection over 100 dts recorded sound tracks and I don't think ill be listening to 5.1 surround anytime soon. Im back in the two channel phenomenon.
I should give this a 10..but I had to deduct points because I can hear a faint fm noise from my aux. (I have 4 other different vintage receivers and they're dead silent). I heard this is a common problem. I also changed one of the two big capacitors. it was leaking. I replaced it with a Nichon..the other is the Elna. Works perfect together. The FM tuner is a bit off but what do you expect for a receiver that is over 30 years old.
Reviewed May 29th, 2014 by 4pepperann
Very nice sound from this vintage Pioneer
SX-737. Clean and crisp and has that awesome wood look. Love vintage Pioneer Receivers.
Reviewed Dec 02nd, 2012 by Carl Paul
This is the most powerful 35 watts I have ever heard. It shames the new garage 90 watt Sony receiver. This is really all the power you will ever need in a mediuum/small room. All music forms play well. It is a bargain against the high powered vintage receivers and its build and sound exceeds the vintage marantz recievers. A pleasure to own.
Reviewed Sep 13th, 2012 by mgdavenport
The Pioneer SX737 Receiver produces a warm mellow sound quality reminiscent of valve amps,
coupled with a nice bass and impressive looks, electric cool blue display this receiver
has more than stood the test of time.