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Pioneer SX-450

FM/MW Stereo Receiver (1976-79)

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Pioneer SX-450


The Pioneer SX-450 is a 15 watt FM/MW stereo receiver featuring FM muting, tape monitor switch and provision for 2 pairs of speakers.

The unit employs a direct-coupled OCL circuit in the power amplifier with a first-stage differential amplifier.

High FM sensitivity is ensured by a low noise FET in the front end with a frequency linear 3-gang variable capacitor.


Tuning range: FM, MW

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

Frequency response: 20Hz to 60kHz

Total harmonic distortion: 0.5%

Damping factor: 25

Input sensitivity: 7.5mV (mic), 2.5mV (MM), 150mV (line)

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

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

Speaker load impedance: 4Ω (minimum)

Semiconductors: 1 x FET, 3 x IC, 28 x transistors, 15 x diodes

Dimensions: 448 x 141 x 307mm

Weight: 8.6kg

Accessories: FM T-type antenna

Year: 1976


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Reviewed Jul 05th, 2019 by vglory88

It all depends on how it was used. Some were played to death by young punks, and some were played on weekends only, couple of hours a week. Those low mileage SX-450 are hard to find, but when you get them, they sound better than anything new under $2000.

Reviewed Jul 21st, 2018 by chrisvw78

excellent petit ampli tuner qui n'a de petit que les caractéristiques.
Drive sans problème 2 Epi 200b + 2 Cabasse dinghy
A 1/4 du volume les voisins viennent sonné!!!
Pas besoin de mettre le loudness le son est très propre et clair.
Très bon Receiver qui capte également parfaitement la radio sans trop de souffle même en stéréo.

Reviewed Jun 22nd, 2018 by GoodSammy

Until the dawn of the monster receivers, a 15-20wpc was the norm for entry level audio gear. By modern standards 15wpc would be a joke. But everybody forgets that decent vintage audio in good repair punches way above its weight. A co-worker found this in their storage unit. Probably been sitting for 15 years. After a few squirts of DeOx, a good dusting, and installing new LED's I gently turned it on. First impression........
Really impressed with the sonic quality. It drives my restored Acoustic Research AR2ax's (8ohm) speakers with no problems. The internals are very well laid out definitely going to make this a priority restore project over the winter.

Reviewed Jan 07th, 2018 by deangill89

just got one the other day of ebay and its grate needed a tiny bit of TLC gave it a good clean up and put new Viner on it as it was pealing of and new led bulbs works a charm and is better then my pionner a-z370 hifi system that has way more power i would definitely recommend this stereo receiver looks bad on paper but boy will you will be in for one big surprise when you power it up as it sound more powerful then today's stuff that's got a higher wattage

Reviewed Sep 29th, 2017 by Sandutter

My first vintage receiver, and I still love it. Not the most powerful, but it fits perfectly in a retro bookshelf with matching speakers. Great looking and sounds wonderful. At night, the warm glow from it will make you feel relaxed and happy.

Reviewed May 12th, 2017 by uchu

Excellent ampli tuner comme Pioneer savait faire a l'époque !!! Une très bonne qualité de son ,impressionnant pour cette puissance !

Reviewed Apr 27th, 2017 by Dj Flyer

A really good looking receiver with a sound thats not great but ok for the non audiophile.
With only 15wpc it need speakers with high sensitivity.
I use it as a tuner to my SA-510 that sounds far better.

Reviewed Mar 28th, 2016 by JATL

I had the same problem as w3flh. I replaced the filter captor at $2 and that solved the problem. I paid $15 for the unit. It sounds great in my man cave.

Reviewed Jan 07th, 2015 by w3flh

Just picked up this SX-450 to help round out a c.1978 all-Pioneer hi-fi set up {SX-450 receiver, PL-518 turntable, HPM-40 speakers, SE-405 headphones}. It's in very good shape, with every function and bulb operational, no scratchy pots, just the fluky start-up (static-y for 5 to 10 seconds before settling down).
Anyway, what a great sounding receiver! Solid power, providing rich musicality, with plenty of bass without being boomy, good extension on the highs, and nice clean playback throughout the spectrum. Don't worry about it only pushing 15W - this is true RMS wattage, conservatively rated, with plenty of headroom. A fine vintage receiver with minimal bells and whistles, a real workhorse.

Reviewed Jan 03rd, 2015 by mrmisi69

This product is the smallest one from the 1976 product range, and starts it from the bottom. These days only the bed time stories tells about such a built quality, performance that Pioneer offered even from the entry products. It is not an ultimate solution having non-plus ultra Hi-Fi product, however it does its job as a bookshelf receiver. The design still fits to today's living room. I bought it in very bad condition on second hand portal. After the usual re-newal steps (caps, aged resistors, transistors replacements, null-point setting etc..) the sound characteristic got improved big time. Only the beamed noise came from the transformator via high sensitivity parts of the amplifier caused low frequency noise. This noise was disturbing only by using headphone in silent enviroment, but I was curious enough to find its source. I realized that my receiver is assembled with a non shielded transformator, however it is an original part placed at the time of the production. By chosing the easiest solution, the transformator was turned clockwise a third, and suddenly the low freq noise dissapeared.
If you find this product in good shape, and ready for re-newal, definitely worth to deal with. I am sure this receiver will satisfy also someone else another four decads later.



re: SX-450

Found one in a dumpster.
Needed a good cleanup, new bulbs and that's it.
Works like a charm, looks like a gem and sounds brilliant!

re: SX-450

Thanks for manuals Digger747! My Pioneer sx-450 working fine now and i am going to keep it that way!

sx450 manual

Thank you for the manual. We are still using this receiver. I was considering replacing it but after reading the reviews I think I will keep it. The only problem is a broken volume knob!

Bought one for 15$. it is

Bought one for 15$.

it is nice to have the schematic ready in case something is wrong.


Pioneer SX-450 Receiver

The SX-450 was my first stereo,bought new in 1978,this is a cool little receiver.Had it hooked up to Zenith Allegro speakers and a B&O 2404 turntable.Have good memories of listening to Classic rock by the light of tuning scale.

Missing Pages?

My tuning string is broken. Your service manual includes directions to change the string, but is missing the pages (namely 14 and 15) that tell you how to safely remove the front panel of the receiver. If you don't remove the front panel, you can't change the string. Could you please help?


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