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sony str-dh770

Discussion in 'Home Theater & Video' started by Numba132505, Sep 26, 2018.

  1. Numba132505

    Numba132505 New Member

    Messages:
    2
    Has anyone been able to add preamp outputs to this unit?
     

     

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  2. PianotunerNJ

    PianotunerNJ Active Member

    Messages:
    175
    Location:
    Central NJ
    I have Sony DN1050 and I use HDMI for everything, except my turntable. Any analog input works fine and the label for the input can be customized to reflect what’s there. I use a parasound pre, works beautifully. I think I use the stereo CD input.
     
  3. Radio73

    Radio73 New Member

    Messages:
    19
    I don't have the 770, but someone gave me its little brother, a 550 with bad HDMI and USB boards. I could not stand the sound that came out of it and threw it in a closet. Pulled it out the other day and was going to strip it for parts when I came up with the same idea!!
    I got a schematic, (550 and 770 use same) determined where the signal enters the amp at the Front Left and Right, then hacked it up and made a FrankenAmp out of it.
    The first capacitor after the DIR chip for Front Left is C610 and C660 for the Front Right. They are both 10uF@50V.
    Desolder or clip the Negative lead of the caps and attach your wires to that lead and the spot on the board where it went and voila! PreAmp Out and MainAmp In are now yours!
     
  4. Radio73

    Radio73 New Member

    Messages:
    19
    And yeah, it sounds FANTASTIC now with an EQ. :banana:
     
  5. Numba132505

    Numba132505 New Member

    Messages:
    2
    @Radio73 Do your remember where you got the wiring diagram?
     
  6. Radio73

    Radio73 New Member

    Messages:
    19

     

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  7. Radio73

    Radio73 New Member

    Messages:
    19
    Here's some pics of how I butchered it. First an overall photo of what went where. Notice I just clipped the legs of the capacitor and soldered my wire straight to it and the spot left on top of the board. That way you wont have to pull the whole board out to do it.
    Screenshot_20181126-194900.png

    Here's the jacks I ran them to. I dont use these input jacks for anything so I just whacked them off at the board and soldered my wire to what was left. Yes, I know I should have used some shielded wire but this was just a test to see if it could be done.
    20181109_194005.jpg

    Here's as best of a closeup of the capacitors that got snipped. Yeah its crude. But its Franken-Amp so I didn't care. And since it was free and the HDMI board and the USB input were both toast, I really didnt care. LOL!
    Screenshot_20181126-200043.png
     

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