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Sansui AU-719

Stereo Integrated Amplifier (1979-80)

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Sansui AU-719

Specifications

Power output: 90 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 20kHz

Total harmonic distortion: 0.015%

Damping factor: 110

Input sensitivity: 2.5mV (MM), 200mV (line)

Signal to noise ratio: 88dB (MM), 100dB (line)

Channel separation: 65dB (MM), 70dB (line)

Output: 200mV (line)

Speaker load impedance: 8Ω (minimum)

Dimensions: 430 x 168 x 395mm

Weight: 16kg

Year: 1980

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Reviews

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rating
Reviewed Nov 18th, 2017 by jhanoomansing

excellent power house

rating
Reviewed Jun 13th, 2017 by joe4fun

Sturdy, powerful amp with a clean sound. Looks great, and can take a bit of abuse. Love the controls. It's been dependable.

rating
Reviewed Nov 27th, 2016 by bungee

The 90w RMS pc is a conservative figure. Furthermore a slew rate of 170v/uSec means this amp can respond very quickly to transients.

The AU-719 manages to be both an incrediby refined and powerful amplifier which few, if any, sub £1000 modern amps could match.

 

Comments

Semaphorian39th's picture

re: AU-719

I have been able to spray contact cleaner on an AU 517 Volume pot through the very small slits and successfully the fluid reached the area mostley that required to see it.

Wd40 was also applied later and it finished the process rather well.

re: AU-719

My AU 719 has a falure on the volume button, which you can hear on the speakers. How does the volume button get off and how do I get rid of this falure?
Thanks for your awnser
Robert

re: AU-719

Unfortunately it sounds like You have to replace the volume-potensiometer, because
the potensiometer are enclosed and You cant reach it for cleaning.

Of cause You could always try to unsolder the potensiometer then force-off the cover
and clean the resistor-lane. But normally this fix only last for a short time. The
potensiometer is probably worn out and need to be replaced.

Thanks

I appreciate having access to the service manual for my AU 719. I am the original owner, purchased this beast in 1980.

When I turn on the amp, the on-light just flickers and it will not power up. Any fix other than taking it in would be appreciated.

Paul

re: Thanks

power protection circuit is not allowing amp to come on. possibly from noisy cap, shorted output circuit, etc... you can bypass the circuit by disabling the error looping circuit. I have model au-717,so circuit maybe different than mine. on mine removing the base lead on TR602 disables most of the power protection circuit.

Flickering power indicator

I bought my amp in Okinawa Japan in 1979. You are correct, Paul, it's a beast. Mine also developed this problem, and the only thing i've found wrong is that three of the four big filter capacitors leak. They are the 12,000 Mfd. can capacitors near the transformers.

The Test:
I removed them from the amp and gave them a charge of 24 volts and read each of their voltages about ten seconds after dis-connecting from power. Then I charged them again and waited an hour to test their voltage. Three of them had much lower voltage than they had with the ten second test. They should not show any loss at all.

One of these days I'll return this project to the bench and finnish the repair, whenever I put the money out for the capacitors. I like to do things once so I'll replace all 4 of them.

rajesh patel Thank u for au-719 sansui

Again Thanku....for co operate...
Raju Rajkot

Muchas gracias!!! Saludos

Muchas gracias!!!
Saludos cordiales.
Eduardo.

Muchas Gracias

Les Agradezco mucho este manual. Hace tiempo que mi amplificador dejó de funcionar y necesitaba el esquema para intentar repararle.

Cordiales Saludos.

Alejandro.

didik wiryawan's picture

Service Manual AU719

Dear Friends at Hifi Engine !
You are doing a great thing, indeed.
I am happy today when found the service manual of my AU719.
Thank you, danke, terima kasih, arigato... -:)

I rebuilt the power amp section with MOSFET final stage but keep the input stage using uPA68.
It is a new different pcb but with 100% same dimension as the original.
The original 'power amp card' are now safely kept considered as a treasure vintage.

Best regards,
Didik Wiryawan
Jakarta, Indonesia

hanurawan_n's picture

AU719

salam kenal mas Didik, saya punya unit ini beli second..
phono nya sepertinya tidak berfungsi dng baik...cara memperbaikinya bagaimana ya

sansui au 719

Hi didik wiryawan,

i have read few diy indonesian audiophile books and came to know sansui au 7900 and sansui au 719 is very sought after.Is there any reason for this amplifier to be look for and why do you need to diy the power amp part??does you managed to get better sound from it??Does au 717 holds the same league with au 719 in term of sound?

thanks

Thanks!

After so much time spent in searching for my old Sansui AU-719 service manual, my quest is finally done! Thank you so much for excellent feedback!
Best regards,

Ivan

complimenti una scelta molto

complimenti una scelta molto completa ;ottima la qualità grazie

grazie

grazie per le informazioni molto dettagliate

Merci merci merci beaucoup !

Merci merci merci beaucoup !

So Thank's

For many years I am looking the Sansui AU 719 servis manual, at last I found what I am looking for in HiFi Engine. Thank you so much. GOD BLESS YOU. Once again THANK YOU.
Aria Wijaya.

Thanks!

It's nice to finally find the service manual for the AU-719... now to adjust the DC offset :)

Best Wishes,

Mysteryed

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