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Pioneer SX-434

AM/FM Stereo Receiver (1974-76)

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Pioneer SX-434


The SX-434 is Pioneer's budget priced FM/MW stereo receiver.

It features a high performance FM front end with low noise FET and 3-gang frequency linear variable capacitor. Phase linear ceramic filters and an IC in the FM IF section provide high selectivity of 60dB.

Other features include click stop tone controls, 2 pairs of speaker terminals and a headphone socket.


Tuning range: FM, MW

Power output: 15 watts per channel into 8Ω (stereo)

Frequency response: 30Hz to 25kHz

Total harmonic distortion: 0.8%

Damping factor: 25

Input sensitivity: 10mV (mic), 2.5mV (MM), 150mV (DIN), 150mV (line)

Signal to noise ratio: 65dB (mic), 70dB (MM), 90dB (line)

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

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 1 x FET, 3 x IC, 27 x transistors, 13 x diodes

Dimensions: 430 x 140 x 347mm

Weight: 8.1kg

Accessories: FM T-type antenna

Year: 1974


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Reviewed Jun 22nd, 2017 by Xyrios

Nice receiver, reliable and beautiful with a very good warm sound.



Pugsley's picture

re: SX-434

Blessed be the soul of TibouTip, thank you very much for the owner's manual for this receiver. I bought mine dead, but I got it fixed and now it's all pretty and sweet and nice sounding and I love it very much and I use it every day. Thanks again.

mrtncrls's picture

re: SX-434

What was wrong with your receiver?

re: SX-434

Hi. I don't know exactly what was wrong with the receiver you were asking about from the other contributor, but I've had a couple of these units myself not working and can share the experience of repairing them. If the unit is totally dead (no lights, nothing) it's either been a power supply component (usually a failed capacitor or a blown resistor/diode) or once was actually poor contacts in the front panel switch. If the unit comes on and lights up but no sound on speakers left, right or both then it's often a power transistor. Other things, some of which would appear to be serious, are nothing more than contacts and switches needing some cleaning. I really love this little amp and it's very easy to work on. It costs pennies to repair most times but obviously some electronics skills are required. The schematic is crystal clear with many reference voltages to check and compare. All this may not be the reason for the question you asked but if it is I hope it helps. Best regards, Kevin.

re: SX-434

I would like to plug in headphones to my sx-434 but the plug size is much larger. Is there an adapter I could use to make a connection to the 3.5 mm plug?

Pugsley's picture

re: SX-434

You need a 3.5mm to 6.35mm jack adaptor, they have these everywhere. Find a local audio store or get one on the bay.

re: SX-434

Analog would be 1/8" to 1/4" stereo plug. Great little receiver for close up monitoring or headphones. Since I bought mine in 1975 I think it's had speakers on it for less than 2 years. I run KOSS PRO-4A headphones on it I bought in Jr. High in 1969. The headphones finally gave up the ghost (headband rotted out and the cord went tit's up) so I bought a new set of PRO-4AA's. It got recapped 5 years ago with all new uprated drivers and output transistors, plus getting rid of the 2sa725's made a marked improvement. My grand daughter uses it all the time when she visits (she's 6) and wants one or that one when she gets a little older to replace the KLH-20 she has.

So before she gets it, I'll go thru it again to make sure all the voltages are ok and clean everything behind the front panel.


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