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AU-222 From the ground up

Discussion in 'Exclusively Sansui' started by Mike52787, Aug 10, 2018.

  1. Mike52787

    Mike52787 New Member

    Messages:
    23
    Location:
    Englewood, Fl
    About 6 months ago I found a haggard AU-222 at a garage sale for $5, the guy said it wouldn't work anymore. When I got it home I learned why. The fuses had been jumped with wire, and the output transistors were blown. Now I know just enough to be dangerous but not enough to be good about solid state gear, and part of that modicum of knowledge is the fact that if the outputs are blown... probably every other transistor in the unit is as well. So, I stripped it down, removing all the old electrolytics, all the transistors, and any resistors that weren't in spec. Currently it sits in a box waiting for me to get the motivation and disposable income to fully rebuild it. Any tips on component selection or other things I should know about rebuilding this little beast?
     
    SansuiJavier and BLAH BLAH like this.

     

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  2. SansuiJavier

    SansuiJavier AK Subscriber Subscriber

    Messages:
    139
    Location:
    Valencia (Spain)
    There's a guy in France who has restored dozens of 222-555-777-999, he's called Frederic and he has a Facebook page where he puts a lot of photos of his restorations that can help you. This is his link: https://www.facebook.com/son.passion/
    Uslually use Nichicon, Wima, Elna and Panasonic
     
  3. quadmatrix82

    quadmatrix82 Active Member

    Messages:
    279
    Lovely amp highly recomment you replace the adjustment trimmers
    Also the transistors on the tone board 2sc871 I used 2sc2240 ksc1845 will also be good these go noisy. If you 222 carbon resistors on the main amp board check the resistance with one leg out of circuit most likely these need changing too they have a 10 percent tolerance but every 222 I’ve had these resistors are in excess of 25 percent out of spec refer to the service manual to find their location I replaced with metal film equivalent with no issue. Good luck with the restoration
     

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