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1 May 2015

Sansui AU-517 a 70s massive dual-mono amplifier has to be fixed.........


....before fixing the sound was distorted on SX channel and only an odd noise from DX channel

....reconditioned????? ....that's what was told me from the owner!....mmmmh a inch of dust inside and his strange way to "play" music .... :-)

.... the queen dust


....let's start to find the fault


....bottom side

....disassembling power PCB and giving them a check


....oooh I found in the SX power amplifier PCB 2 naughty resistors ...they would have been 150ohm but I found them drifted to 6K the first and around 15K the second ......40 y.o. carbon composite resistor get bored to mantain alays the same value!!! ;-)


....the DX pcb was even worst that the former giving a distorted half-wave .....the negative value was completely missing.......ok there woul be much more work to fix it....but all is gone well!


....ooooh now you can call it reconditioned and fully working!!!!!!!!!





....oooh men it sound exactly how it looks!!!!.......strong heavy with muscles and clearly without uncertainess!!!

It's a great device for Sansui entusiasts and not only for them!!! 

It gives great sensations in term of deepness,detail,presence,coherence.....it's not the absolute best but it's close to be it!!!......if you like 80's temper this is one of the best!

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