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Sansui AU-6500

Stereo Integrated Amplifier (1972-74)

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Sansui AU-6500


Power output: 30 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 30kHz

Total harmonic distortion: 0.1%

Damping factor: 40

Input sensitivity: 2.5mV (MM), 100mV (DIN), 100mV (line)

Signal to noise ratio: 70dB (MM), 80dB (line)

Output: 100mV (line), 30mV (DIN), 0.8V (Pre out)

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 35 x transistors, 6 x diodes

Dimensions: 440 x 140 x 322mm

Weight: 11.5kg



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Reviewed Sep 16th, 2018 by convair52

Back in the 80's we simply replaced 2SA627/2SD188 output transistors with much available and very cheap MJ2955/2N3055 combo. Now it sounded like a 50 watts per channel integrated amplifier. I like the way the bass on this model that's why I'm here looking for its schematic.

Reviewed Mar 06th, 2017 by Mathewb1234

Not enough power

Reviewed Apr 24th, 2016 by smurfer77

Just testing this amp out now. Initial impressions have surprised me. This amp is a great sounding unit, with terrific bass and clarity. More than enough power for my needs. Doesn't have selectable phono 2 load like some of the other models in this series like the 9500.

What surprised me is how much it sounds like the triple digit series, after reading about harsh sound from various websites from this series. However, most people are talking about the sought-after 9500; maybe it sounds different. (after all the TOTL Au-999 sounds bright and lacking in bass compared to lower models).

The DC was not far off zero and was easy to adjust to practically zero. The bias was running cold at about 15 mV. I kicked it up to 30 mV as per the manual. Again and easy adjustment if you have the tools.

The layout of the internals are really good, spaced out and make it a good amp to restore. Very few boards would even need to be removed to fully rebuild/recap. The build quality of the chassis and boards looks to be still excellent, approaching that of the previous triple digit series. Again, a surprise to me. One difference in this series compared to the older series is that the bass adjustment is centred around 20Hz instead of 50Hz taking away a bit of the bass magic IMO. And the loudness in this series boosts bass and treble points almost equally (where as the older series boosted bass much more than treble point, and this is preferable to my ears).

Extremely happy with my initial impressions - not quite the tonal magic or 'space' of the AU-777A, but excellent nonetheless, including the bass. Will report back if my opinion develop significantly.

Reviewed Jan 28th, 2015 by Paalkj

An old, but good, Integrated Amplifier.
Enough power to create a quite decent volume, and a big power supply witch is able to control big magnets.



re: AU-6500

Hi, I am trying to restore my Sansui AU6500 and i would like to know if is it possible to use the transistor 2SD551 and 2SB681 instead of 2SD188 and 2SA627. Thank you very much for help.

re: AU-6500

There is a sansui group called "exclusively sansui" on AudioKarma.org

They will be able to help you out over there.

re: AU-6500

Thank you very much.

re: AU-6500

I've checked photos online and have read the manual, but can this receiver accept a turntable with a magnetic coil (MC) cartridge? Some later Sansui models had MM and MC labels for the phono inputs at the back, but this one doesn't have for its two sets of phono inputs.

re: AU-6500

Most of the older Sansui amps have the same input sensitivity (minimum usable input voltage, i.e. same gain/amplification) for both phono inputs with the difference being that phono 2 sometimes has a selectable load to match to your cartridge (this is not an option on the AU-6500; both phono 1 and 2 are loaded at 50 kOhm).

If you look on page 5 of the manual below the picture of the turntable it is "with magnetic cartridge" which sound like it could mean either moving coil or moving magnet, since they both are 'magnetic' in mechanism (although it is possible that something was lost in translation and they meant 'magnet' (i.e. moving magnet) not 'magnetic').

Anyway, the input sensitivity is claimed at 2.5 mV. This is quite small & sufficient for many moving coil cartridges. If your cartridge is rated with output voltage less than this value, you may have difficulties with hum.

I tested the AU-6500 with an AT33ev moving coil cartridge which is rated to output of 3 mV, which is close to the limits of the phono input sensitivity. For my tuner or tape deck I usually have the amp volume knob at 3, then when on phono with this cartridge I would have to turn up to 5 or 6. The trick is, if you want it louder than that you will start to hear some hum noise from about 6-7. At 6, I do hear a hint of noise in the quiet sections of music.

In summary, a moving coil cartridge with output of about 2.5 mV is fine and I use it like this, but >5 mV would be more ideal and push you into the no worries zone. Note that some high output moving coil cartridges (like the denon DL-110) output as much as some moving magnet carts. You should be able to find the output of your needle in your manual or online.

This website is not affiliated with or sponsored by Sansui. To purchase AU-6500 spares or accessories, please contact the company via their website or visit an authorised retailer.