(Topic ID: 248142)

2N3984 replacement


By LongJohns

85 days ago



Topic Stats

  • 12 posts
  • 6 Pinsiders participating
  • Latest reply 83 days ago by Tomass
  • No one calls this topic a favorite

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    #1 85 days ago

    Hi - wondering what people are using instead of the 2N3984 transistors on the Bally 6803 drivers boards?

    #2 85 days ago

    Don't recognize that part number. Which transistor location?

    #3 85 days ago

    Are you sure it is not 2n3904?

    #4 85 days ago

    opps, sorry wrong game series - this is for the Bally 6803 series, part of the switch matrix: Q48-Q55

    #5 85 days ago

    Actually looking at the several drawings, looks like it should be a 2N3904 as Tomass mentioned (sometimes it would be nice to have clear scans of the manuals)

    #6 85 days ago

    Scanning the Atlantis schematics is on my to-do list. Scans that are basically unusable is one of my pet peeves.

    #7 84 days ago

    2n4401 can replace 2n3904 most of the time.

    #8 84 days ago
    Quoted from barakandl:

    2n4401 can replace 2n3904 most of the time.

    I have done this too since I saw that it is compatible, but why does Williams use both on the same system 11 board? Just seems odd to me.

    #9 84 days ago

    2N3904 is a very common NPN why change?

    #10 84 days ago
    Quoted from 76brian:

    2N3904 is a very common NPN why change?

    2n3904 is better at low current. 2n4401 can handle more current. usually doesn't matter. 2n4401 is my jellybean NPN

    Quoted from Tomass:

    I have done this too since I saw that it is compatible, but why does Williams use both on the same system 11 board? Just seems odd to me.

    Maybe 2n3904 cost them 0.01 each and 2n4401 cost 0.012 each and when you buy 100k of them at once it adds up.

    #11 84 days ago

    Fedensa to Kordek:

    "Tell Ritchie to take those drop banks out of the game, purchasing bought 2n4401's instead of 2n3904 and we got hosed"

    #12 83 days ago
    Quoted from barakandl:

    Maybe 2n3904 cost them 0.01 each and 2n4401 cost 0.012 each and when you buy 100k of them at once it adds up.

    Makes sense. Thanks.

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