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Easiest Amplifier/Receiver to work on?

Discussion in 'DIY' started by birchoak, May 27, 2018.

  1. NAD80

    NAD80 Super Member

    Messages:
    2,242
    Location:
    Carlisle PA
    birchoak I have a 3140 integrated amp (40W). 4020 tuner.
     

     

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  2. sKiZo

    sKiZo Hates received: 8642 Subscriber

    Oh, hands down ... the Sansui QRX-9001 ...
     
  3. birchoak

    birchoak Hi-Fi Nut Subscriber

    Messages:
    689
    Location:
    Amesbury, MA
    Very neat layout in that monster, but quite a few parts! Do you have one? That toroidal xformer must weigh more than a cinder block!
     
  4. sKiZo

    sKiZo Hates received: 8642 Subscriber

    Oh, yeah ... and about the easy part ... just kidding! Here's what one looks like torn down for a simple control cleaning ...

    [​IMG]

    And that toroidal certainly does eat up some serious real estate ...

    [​IMG]
     
  5. birchoak

    birchoak Hi-Fi Nut Subscriber

    Messages:
    689
    Location:
    Amesbury, MA
    I thought maybe there was a touch of humor--Looks like you fix these professionally; I like the blue sticker you add to the trafo. I'm about done with stuff that requires convolutions such as you have illustrated.
     
  6. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
    27,885
    Location:
    uk.. the middle bit
    sorry had to do this ...:D[​IMG]
     
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  7. birchoak

    birchoak Hi-Fi Nut Subscriber

    Messages:
    689
    Location:
    Amesbury, MA
    Ok, that looks pretty simple! Chip amp?
     
  8. birchoak

    birchoak Hi-Fi Nut Subscriber

    Messages:
    689
    Location:
    Amesbury, MA
    A new one to add: Scott R74S. Just about all the boards slide off these little square posts--no connecting wires holding them in place! Neat wiring, plenty of space.
     
  9. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
    27,885
    Location:
    uk.. the middle bit
    one transistor .. it can be done with just a transistor and speaker if you have a suitable transistor .saying that i think the capacitor is needed really .
     
  10. maxhifi

    maxhifi AK Subscriber Subscriber

    Messages:
    2,981
    Location:
    Edmonton Alberta Canada
    I like the 1970s Sansui receivers, like the 890DB, 9090DB, etc. Takes no time at all to pop the hood and start troubleshooting.

    Opposite end of the spectrum would be SAE amplifiers, man what a pain to get into!
     
  11. gadget73

    gadget73 junk junkie Subscriber

    Messages:
    36,773
    Location:
    Southern NJ
    My early Sherwood SS integrated is pretty simple. Take the lid off and everything is right there, and there isn't much "everything". Each circuit is on it's own board too, phono, line stage, and power amp for each channel. Not much to the power supply, its a handful of parts on a terminal strip plus a cap strapped to the bottom. Early SS circuit design, just barely enough parts to make the thing actually function.
     

     

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  12. Bruno Primas

    Bruno Primas Active Member

    Messages:
    143
    20180218_113223.jpg

    Realistic STA-77A. I especially like how the output transistors are mounted, especially since one of the left side ones was open. Soooo much room to work on.
     

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