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Pioneer SX-750

AM/FM Stereo Receiver (1976-78)

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Pioneer SX-750


Tuning range: FM, MW

Power output: 50 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 50kHz

Total harmonic distortion: 0.1%

Damping factor: 30

Input sensitivity: 5mV (mic), 2.5mV (MM), 150mV (DIN), 150mV (line)

Signal to noise ratio: 70dB (MM), 90dB (line)

Output: 150mV (line), 30mV (DIN)

Speaker load impedance: 4Ω (minimum)

Semiconductors: 1 x FET, 7 x IC, 42 x transistors, 40 x diodes

Dimensions: 480 x 149 x 371mm

Weight: 13.7kg

Accessories: FM T-type antenna


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Reviewed Jul 30th, 2019 by

I found one of these baby's 2 years ago at Salvation Army Thrift Store for $10.95. Mint condition minus the fake wood peeling off the case. i did a nice refinish on the case. It has served me well the past 2 years. I'm getting a bit of a hum now, so I'm going to do a recap on the critical areas. This is a great receiver.

Reviewed Jul 06th, 2019 by

I'm surprised no one has commented on this iconic receiver in years. I picked one up for a benjamin. It has been futzed with over the years as evident by the ripped off veneer and some shotty cap replacement on the power/protection board. So....I put her on the operating table and simply did a proper recap job on the power/protection board, and a thorough deoxing of the knobs n switches. Wow! You can hear a pin drop at full volume. Very nice phono stage, and the aux provides excellent reproduction for modern devices. I had a SA 9100 in it's place which is considered a superior device....however. The 9100 is now on the shelf. Never miss a chance to pick up one of these fine receivers!! They are fun to work on and their performance is spectacular.

Reviewed Jul 13th, 2017 by

This is my first comment because I've recently registered in the site.
Yesterday, I bought this 'little' machine. I did not can stop to smile with the sound. Totally pleasured.
I was surprised for the punchy sound, open soundstage and clear bass. It was paired with my Fostex FE-206En in a bass reflex enclosure.

Reviewed Feb 23rd, 2017 by

I concur with all the previous reviewers- this is a beautifully-built receiver with a LOT of bang for the buck. It's my current #1 living-room powerhouse.

Reviewed Oct 26th, 2016 by

great power & durability

Reviewed Mar 02nd, 2015 by

I am going to rate this 10/10 due to the overall value given the price these are currently selling for, $85-$125 (early 2015). FM has very good signal strength, phono preamp delivers plenty of power for the turntable, vinyl sounds awesome and at a conservatively measure 50 wpc, there is plenty of power to spare. Aesthetically, it is a beautiful piece of equipment. Best value on the market today and still under the radar.

Reviewed Jan 14th, 2015 by

Hello everybody!
I get an Sx-750 this xmas and till know i´m very pleased with him. This old beauty have a very nice equalizer; the bass and the treble are very good. For my kind of music (hard rock) is almost perfect. For know i conect him to a Monitor Audio RS8 speakers and the result are really good. I want to by a vintage Pioneer HPM speakers for this old baby and i´m certainty the sound wil be better.
Great receiver!



re: SX-750

I have a "Supergrade Level IV" restoration for the Pioneer SX-750 and other SX-x50-series receivers. Power switch upgrade, 4 new audio opamps, LED retrofit, electrolytic and film cap upgrade, walnut re-veneered cover, FM IF filter upgrade, etc. When fully upgraded, if it wasn't for the power level, you'd think you were listening to an SX-1980. IMHO, without the restoration, performance is just average.

re: SX-750

Are you still around?

re: SX-750

Is this receiver hard to keep up and running well? I just picked up one in good shape and am wondering if it was worth the money? Thanks!

SX-750 power switch bypass

After 37 years, the power switch on my SX-750 finally wore out. It's been inconsistent for the past few months and last night just refused to turn on. The switch is a Noble E35961. Anyone know where I might find a replacement? I'm afraid used ones may not have much life left in them either. In the mean time, I added a jumper wire from the unswitched AC line to the switched AC line on the rear of the unit. This has the effect of bypassing the rotary AC power switch and keeps the unit on.

re: SX-750 power switch bypass

I replace the power switch with a 10A part when I do a SX-750 restoration. I do have an extra power switch with minimal wear. You would have to drill out the aluminum rivets that hold the bad power switch and then install the new one with 2-56 screws and nuts. It's tedious, but the original replacement should work fine. If you want, I could send close-up photos of the contacts. PM me if you want it.

re: SX-750 power switch bypass

Every time you turn on a high power stereo their is a big arc/spark on the points of the on/off switch.
This is because the HV (in this stereo 15,000 uf 50 vdc) filter caps on the power supply are totally discharged and at about .1 ohm ESR (effective series resistance) hence a big turn on surge current. It is best to always use a regular ac outlet switch in a strip to turn off & on your unit while leaving the stereos switch always on. These way the junk Chinese outlet strip gets the arc and not your stereo switch!

re: SX-750

My unit cuts out once in a while. The relay clicks out and back in. I do not play it loud. It is not running hot. Any advice?

re: SX-750

Just got this manual. If not already fixed let me suggest. On the power amp assy AWH-046 their are two bias adjust pots VR1, VR2 they are in series with multi diodes D3, D4. turn these two pots all the way to the left. When pioneers get old, they seem to have output transistors, that after years of use, need less bias and turn on to hard, cause heating of outputs and after awhile, cause a voltage output offset, which the relay sense circuit sees this dc and clicks off. If bias (after doing this) is to low, with pots all the way to left, the audio will sound distorted, but only at low volume. Then you will have to crank up until distortion goes away. Turn balance control to left, while adjusting the left pot and right, for right channel pot. Usually VR1 and VR2 turned all the way left, after years of service works OK though. Also a speaker coil, that when a speaker moves out, hits the magnet, it shorts out the coil and unit sees a momentary short, which also cuts off the relay. This is rare and usually a scrapping woofer (If you push woofer in front with hand it scraps on magnet). Try disconnecting say right channel entire speaker, then crank up stereo and listen to left and see if cuts out. If not, unhook left and re-hook right, then crank up, to see if relay cuts out. Then you know it is a speaker for sure and on which side it is. Best of luck..............doug8

re: SX-750

No. Don't make any internal adjustments unless you use proper test equipment and procedures.

re: SX-750

Thanks for the service manual. You are a life savers!

re: SX-750

thx for the service manual!


folly's picture

re: SX-750

Thanks for this manual.

Igor's picture

re: SX-750

Thank you!

re: SX-750


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