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Pioneer SX-737

AM/FM Stereo Receiver (1974)

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Pioneer SX-737

Description

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.

Specifications

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

Weight: 13.2kg

Accessories: FM T-type antenna

Year: 1974

Downloads

instruction/owners manual  English

brochure  English

service manual  English - mensajero773

If you have any problems opening files please read the download FAQ. All files are provided under strict licence and reproduction without prior permission or for financial gain is strictly prohibited.

If you have additional documentation please consider donating a copy to our free archive.


Reviews

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rating
Submitted 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.

rating
Submitted 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.

rating
Submitted by 4pepperann

Very nice sound from this vintage Pioneer
SX-737. Clean and crisp and has that awesome wood look. Love vintage Pioneer Receivers.

 

Comments

re: SX-737

I have one of these from my old hippie days and the speaker channels on the right do not appear to work on sets a or b. Both speakers test out ok on left side. What can i do to fix this?

DAB Analog switch off

I have a 737 which performs absolutely brilliantly, with fantastic FM reception.
Does any one have info on what happens to such beautiful pieces of equipment
should the 2015 analogue switch off go ahead, is there any type of conversion
that can be used to allow the use of such equipment to continue.
This also applies to many other fine HI-FI receivers

noise Sx-737

I have my SX-737 has a noise problem as when you fry an egg, and so far nobody has given me an explanation of the problem or could be.

The symptom occurs with the volume to zero, and no receiver or source connected to the potentiometer that is clogged, this happens after a while and only for the right channel.

Someone could give me a direction that the review or where to start?

thanks

re: noise Sx-737

Could be a power relay being dirty

re: noise Sx-737

Most of the problems are old electrolytic capacitors. Use only fresh (!) high quality new ones. Use 0.5 -0.8mm solder only, and lots of for bad points.

re: noise Sx-737

I agree with you, there's a lot in those 35 years, they are already at the end of life. Capacitors lose efficiency already at 15 years old ...
Right now I'm open with a 737, was the pair Q1 and Q3 with thermal noise. When I put the selector on AUX position., PHONO to go through to make adjustments, I found more thermal noise, this time on both channels. Still have not researched the issue, but it is easy: replace all transistors ...
I also found an error in the schema, on page 22, power amp, and dc current adjustment: adjustment to dc, the right is the VR3 and VR4 (10K), and is the current setting VR1 and VR2 (100R). Pay attention.

Carlão Vintages - Brazil

re: noise Sx-737

Hi Usually this problem is related to thermal noise, caused by problems with transistors. Use a researcher signal, or a small amplifier (can be amplified in a box pc), and go searching in the pre terminals of transistors, and then the output amplifier. You will see that the noise happens in a forward part of the circuit, so pay attention to this site transistors. If the touch probe or amplifier input on a terminal of some transistor, and the noise occurs, then it is this component that is defective. replace with a new one.

Carlão Vintages - Brazil

sx737 noise

If so then it could be capacitors, output transistors, transistors on the power amp board, wire wrap terminals. Sorry but there are alot of things that go bad at age 35.

00Snake's picture

SX-737 Sound Issue

My SX-737 Pioneer Stereo Receiver works fine, but sometimes the sound goes off all of a sudden regardless of the function (AM, FM, Phono, AUX, Mic). The sound sometimes goes off for hours, and sometimes for just a few seconds before it goes on again.
I have no idea what the problem might be, so any help will be truly appreciated.

The protection circuit

The protection circuit could be the problem, look at the protection circuit board and remove Q6, this will inhibit the protection circuit but still give the power up sequence.

re: The protection circuit

Did you ever get this problem corrected. I have the same problem and would like to repair it. any advise?

Sx 737 channel A cuts out

So you say to remove Q6, does that mean unsolder the transistor from the curcuit board? It seems like the overload protection is cutting in prematurely. Is there an easy fix?

Loss of sound

I have a SX 780 that seems to have the same issue. I think it is a protection relay as I don't hear the click after the unit powers up sometimes and others it comes on and plays for a short time and then loses the sound. I am still looking for an answer but it is looking like I am going to have to take it in for service. $60 deposit and $85 an hour. I only paid a hundred for the unit and it is in pristine condition but I am choking on the repair cost.

re: Loss of sound

did you ever get this problem corrected? if so how?

SX-737

Se les agradece el que esté publicado este manual de servicio, me permitirá darle vida a mi SX-737 y repararlo de acuerdo a parametros de fabrica.

Atte

Carlos Bocca T

CHILE

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