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Output transistor recommendations for Yamaha CA-1000 MKII - how many needed

Discussion in 'Solid State' started by eldarvanyar, Nov 9, 2018 at 3:39 PM.

  1. eldarvanyar

    eldarvanyar Member

    Messages:
    68
    Location:
    London, UK
    Hi,

    I have a CA-1000 MkII in the UK and would like to overhaul it

    Can anyone tell me how many transistors are needed and which ones to go for?

    Reading a previous thread someone had used
    Onsemi MJ21194G and MJ21193G (250w)
    MJ15015G and MJ15016G (180w)

    Thanks




     

     

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  2. avionic

    avionic " Black Knights " Subscriber

    Messages:
    43,684
    Location:
    Fort Dodge, Iowa
    2 of each total for both channels.
     
  3. avionic

    avionic " Black Knights " Subscriber

    Messages:
    43,684
    Location:
    Fort Dodge, Iowa
    Don't know how to use a service manual?
     
  4. clinic-audio

    clinic-audio all on YAMAHA untill 1990

    Messages:
    2,180
    Location:
    France
    If you need help I am not so far away
     
  5. eldarvanyar

    eldarvanyar Member

    Messages:
    68
    Location:
    London, UK
    Avionic, you are quite right, I have just downloaded the appropriate service manual


    Thanks really appreciate it. It would be good to keep this amp going for many years to come

    Would this be worth purchasing? Its a kit with all the capacitors

    https://www.ebay.co.uk/itm/132299517705

    Lee
     
  6. avionic

    avionic " Black Knights " Subscriber

    Messages:
    43,684
    Location:
    Fort Dodge, Iowa
    That's probably close to what it would cost with shipping from Mouser or Digikey. I'd think about replacing the two " class A " snap action switches and the protect relay as well.
     
    Oldsansui441 likes this.

     

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