Tweakers' Asylum

Transistor replacement parts??

68.158.186.198

bevo

Thanks to the helpful folks here, I was able to test the transistors in my old Luxman integrated and found 3 burned out transistors I am trying to replace. Problem is, these appear to be out of production and I couldn't find them on mouser or digikey. I found one place that specializes in out-of-production parts, but they have a minimum order of $500. All I need is 1 pair each of 3 different transistors. Any ideas on where I can find such a small order? Thanks.

Follow Ups:

RE: Transistor replacement parts?? - Ugly 12:39:31 09/01/07 (5)
Many times an acceptable replacement can be chosen if you know enough about the originals. What are the part numbers of the original parts?
- Original part numbers - bevo 19:08:57 09/01/07 (4)
  The original parts are SA-968, SC-2581 and SA-1106. Is there some type of transistor equivalency table or something that would make finding suitable new equivalent parts easy? Thanks
  - Sorry, nothing nice like a table that I am aware of. - Ugly 13:13:23 09/02/07 (0)
    If you can't locate crosses it icomes down to applying elbow grease and doing it the hard way....line by line datasheet comparisons. The good news and the bad news is there are seemingly endless amounts of parts to compare against. Luckily it appears you may have a lead on crosses which is always the easiest.
  - RE: Original part numbers - djk 01:25:33 09/02/07 (2)
    http://www.mcminone.com/search.asp?keyword=2SA968&btnSubmit.x=9&btnSubmit.y=9
    http://www.mcminone.com/search.asp?keyword=2SC2581&btnSubmit.x=3&btnSubmit.y=8
    http://www.mcminone.com/search.asp?keyword=2SA1106&btnSubmit.x=8&btnSubmit.y=9
    You will probably need a 2SC2238 to go along with the 968, and base resistors, emitter resistors, etc. Be sure and check the bias transistor and pot. Use a 75W lightbulb in series with one side of the line cord when you first fire it up.
    - MCM (Open in New Window)
    Edits: 09/02/07
    - RE: Original part numbers - bevo 06:38:20 09/02/07 (1)
      AWESOME!!! Thanks for the help. Do you think I could sub an SA1106 for the 968? According to the website, they are substitutes, but the 968 is backordered for 2 months. Thanks again.
      - RE: Original part numbers - djk 15:21:45 09/02/07 (0)
        
        In Reply to: RE: Original part numbers posted by bevo on September 02, 2007 at 06:38:20
        
        " Do you think I could sub an SA1106 for the 968"
        
        No, the 1106 is a 10A output device in the TO-3P case, the 968 is a 1.5A driver transistor in the TO-220 case.
        
        The 2SA1011 would be a good sub for the 2SA968, but I would replace the 2SC2238 in that channel with the 2SC2344 (which matches the 2SA1011).
        
        Even if I had a 968, I would still replace the 2238 it was paired with.
        
        The transistors all all the same age, old. If they had tread to look at you would look at the wear and replace them, even though they held air.
        
        I would also change the outputs and drivers in the working channel if I planned on keeping this unit.
        
        http://www.mcminone.com/search.asp?keyword=2SA1011&btnSubmit.x=11&btnSubmit.y=8
        
        http://www.mcminone.com/search.asp?keyword=2SC2344&btnSubmit.x=5&btnSubmit.y=4
        
        Don't forget to use new grease (clean all the old grease off the heatsink too), and if the insulators are cracked or chipped, replace them. I don't re-use insulators.

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