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help me to sub some transistors

Discussion in 'General Electronics Discussion' started by docb, May 7, 2012.

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  1. docb

    docb

    131
    2
    Feb 11, 2010
    I need a modern substitute for a couple of old transistors. Would prefer standard generic rather than an NTE part. They are two audio transistors from an old reel to reel in the final output stage, so just audio but seem to be high gain transistors.

    2sc644 (or 2sc900)
    2sa564 (or 2sa750)

    Does anyone have suggestions that Digikey might have?
    or.. Any tips on how I can decide on what is a good sub?
    or... Any suggestions for a common high gain NPN and PNP?

    Thanks
     
    Last edited: May 7, 2012
  2. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    I did a quick search on www.findchips.com and found old stock of 2sc644 and 2sa750

    There are several 2sc644 and 2sa750 and 2sc900 on Ebay as well...

    I know you want replacements but for a one off NOS might be the best bet, or at least no brains swap out...
     
  3. docb

    docb

    131
    2
    Feb 11, 2010
    I feel like the selection isn't that critical that I want to pay a premium for originals. The service manual's parts list shows the two options I have in my first message, but the actual unit seems to have a 2SA693 and 2SC536, so any of these seem like they'd be ok.
     
  4. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    I can't verify these and the cross reference is clearly whacked as it's popping both NPN and PNP in as the same cross reference but...

    This search for 2SC536 pops up several modern day replacements, and if you click on any of the replacements it brings up a huge list of cross reference parts...

    http://shop.vetcosurplus.com/catalo...ywords=2SC536&search_in_description=1&x=0&y=0

    And 2SA693

    http://shop.vetcosurplus.com/catalog/product_info.php?products_id=3140&keywords=2SA693

    I believe from this list at least they look like pretty generic all purpose transistors, just need to verify PNP or NPN
     
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