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Sansui AU-505

Solid State Integrated Amplifier (1972-74)

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Sansui AU-505


The AU-505 is a solid state performer that belongs at the head of it's class.

No other integrated amplifier in it's class can touch Sansui's AU-505 for tonal quality, versatility, ease of operation and economy.

Offering luxurious performance at a modest cost, it comes across as the best buy in it's price range.

In fact, it even offers features that more expensive models lack.

Designed in the finest tradition of Sansui's prestigious AU series amplifiers, it delivers performance previously unheard of in a compact unit.


Power output: 12 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 60kHz

Total harmonic distortion: 0.5%

Damping factor: 50

Input sensitivity: 4mV (mic), 3mV (MM), 200mV (line)

Signal to noise ratio: 70dB (mic), 70dB (MM), 75dB (line)

Output: 200mV (line), 30mV (DIN)

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 23 x transistors, 2 x diodes

Dimensions: 407 x 115 x 278mm

Weight: 8kg



re: AU-505

I have an AU-505 I bought at a second hand store over twenty years ago. I also bought a Sony tuner and a pair of Altec Lansing 846B Valencias about the same time. All for less than a hundred dollars.
I've enjoyed the system ever since, however, a few years ago, I blew the diaphragms in the speakers (Jimi Hendrix) and have just replaced them. I also broke the Low Filter paddle off the Low Filter switch while moving the amp around and am now beginning a hunt for a replacement.

I'm going to bi-amp my speakers and use the Sansui on the horns, in conjunction with a Pioneer SX-255R on the woofers, and use them as the sound system for my home media center. (B&O RX-2 turntable, LG oledTV, Samsung blu-ray player, and mp3s streamed from one of my iPhones, or my laptop).

The sound of the amp is everything I want in an amp. I got the Pioneer because the Sansui lost a channel but I've sprayed the Tape Monitor switch (and a noisy Volume potentiometer) with contact cleaner, and everything works well again, except, of course, the paddle switch.

I'll disconnect the amp from the media center, every now and then, to listen to a (mint) copy of Cream's Disraeli Gears I found in a second hand store.

While I'm posting, does anyone know if the low filter paddle swith from an AU-555 will fit the AU-505?

Thanks for the data. The shematics for the AU-505 were useful in tracing the problem with my oscillosope.

re: AU-505

Well thanks Jimjulian! I bought my AU 505 new from Comet in the UK when I was at university in the seventies. It’s travelled around with me, even spending a couple of years in New York when I was working there. I set it up about 10 years ago in my living room, with a turntable so that I could play some old vinyls, but things weren’t right - the speakers had degraded and the sound was very poor on one channel, sometimes not there at all. So all was neglected.

But recently my son started a project to fix the speakers and they are working fine now (Advent) so I tried again to find an engineer to look at the amplifier. But nobody wants to touch these things these days so when I read your post I was intrigued. I went out and bought a can of electrical contact cleaner and gave the tape monitor switch a good spray, and hey presto everything is working fine again!

It’s fantastic to have the old amplifier up and running and I celebrated yesterday by playing a bit of King Crimson

Thanks for the tip, much appreciated

Sansui AU-505

Picked up a 1974 (never serviced) AU-505 for next to nothing. Extremely dirty with grease and dust. Just cleaned the facia and the pots. My default system consists of an Adcom GFA555 II (the beast); Tascam 130; Denon CD1600; iPod classic with Apple lossless songs and a set of Kharma Emotions.

The 505 should not be able to stand in the shadow of the mighty Adcom which specs are in another league. However... listening to Beth Hart's "Chocolate Jesus" is an almost religous ;-) experience. The 505 is much, much more involving, musical... I don't know... just plain more real.

I'm a Sansui convert within a day. Like so many before me.

sansui au 505

Hello i search the schematics for sansui au 505
Please contact me if you have
Thank you bernard

Great sounding, less oversized

This AMP is my first one from Sansui, I put it on ebay. I'm very happy with this little easy handling audio piece. My setup 70's Thorens TD 145 and TEAC P 500 with ProJect DA-Converter. Speakers from I.Q. Germany. Very transparent sounding with much depth and analog warmth. Easy to maintain. You can use schematic from AU 555.

sansui au 505

i use a pair switched, man they sound great

This website is not affiliated with or sponsored by Sansui. To purchase AU-505 spares or accessories, please contact the company via their website or visit an authorised retailer.