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Philips A-440 Transistor

Discussion in 'Datasheets, Manuals and Component Identification' started by shrtrnd, Aug 24, 2012.

  1. shrtrnd

    shrtrnd

    3,665
    453
    Jan 15, 2010
    Want to replace a couple complementary transistors.
    Philips A-400 (NPN) I've found a reasonable NTE cross reference for.
    The Philips A-440 (PNP) is the A-400 complement. NSN#5961011584376.
    They're both obsolete. I found an old spec sheet on them, but was wondering if
    anybody knows where I can find the original transistors.
    I'm preparing to hit my old data books and find something close to the A-440, but
    was wondering if anybody might know where to find these old Philips transistors.
    Thanks
     
  2. john monks

    john monks

    693
    1
    Mar 9, 2012
    What is the make and model of the equipment the A-440 is in?
    I can't find the data sheet.
     
  3. shrtrnd

    shrtrnd

    3,665
    453
    Jan 15, 2010
    Wavetek Model 178 50MHZ Programmable Waveform Sysnthesizer.
    Made in the early 1980's.
    The A-400's are in the preamp, and the A-440's in the amp section.
    Problem is they're complementary, so I'm trying to match them as closely as possible.
    Just having terrible luck finding the original devices.
     
  4. john monks

    john monks

    693
    1
    Mar 9, 2012
    I would replace the A-400 with 2N2219A.
    I would replace the A-440 with 2N2907A.

    They may not be exact but these are the output transistors I use in a tail pulse generator.
    They seem to be very durable in this application.
     
  5. shrtrnd

    shrtrnd

    3,665
    453
    Jan 15, 2010
    Thanks john monks, I'm going to give them a try and see if I can get this thing to
    pass calibration.
     
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