261-00 transistors ?

Discussion in 'General Technical Questions and Answers' started by W9RAS, Jan 12, 2019.

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  1. W9RAS

    W9RAS Ham Member QRZ Page

    I bought three 261-00 transistors the guy who sold them to me knows nothing about them . Does anyone know if these will work on 2 meters ? I looked on the internet tried several websites and searched on Google but could find nothing on the 261-00 . Thank you 73 Bob W9RAS
     
  2. KD8DEY

    KD8DEY Ham Member QRZ Page

    sounds more like an in house manufacturing code than an actual transistor designation....
    Ymmv
     
  3. K7JEM

    K7JEM Ham Member QRZ Page

    A picture might help.
     
  4. WB5WPA

    WB5WPA Ham Member QRZ Page

    An X-ray of the device (so we could see the die inside) would be even better ...

    Another thing to keep in mind today are the plethora of counterfeit parts that are floating around in "the supply chain":

    10 Ways X-Ray Can Help Identify Counterfeit Parts
    https://www.ebnonline.com/author.asp?section_id=4121&doc_id=283441&image_number=2

    https://www.utdallas.edu/~gxm112130/papers/pieee14.pdf
    .
     
    Last edited: Jan 12, 2019
  5. G4COE

    G4COE Ham Member QRZ Page

    Firstly if it's for using at VHF I wouldn't be using 'strange' devices I'd be using some commonly known device.

    We need find out if it's a transistor, FET or other device and then be asking if it's PNP or NPN, what we can do is build a crystal oscillator with a 'known' transistor then swap it for the unknown device.

    I don't know about the USA, as said it may be an in-house number and motor companies come to mind..... Ford car stereos for example can use strange looking numbers, could this be a possibility?

    Dave
     
  6. W9GB

    W9GB Ham Member QRZ Page

    The Motorola MRF 261 was a TO-220AB style package.
    MRF261 NPN Silicon RF Power Transistor, 12.5 V, 175 MHz, 10 W, MFR: Motorola
    https://www.rfparts.com/rftransistors/transistor-mrfsrfm/rftransistors-mrfseries-200/mrf261.html

    Eleflow Technologies (Chinese mfg. with Ted Seymour address in Boca Raton, FL as USA front office) has been advertising MRF261 replacements.
    http://eleflow.com/MRF261 DATASHEET.pdf
    Eleflow was founded by two USA Chinese Scholars in 2005. Eleflow's electronic engineers have rich experiences with designing the pin-to-pin replacement components according to customer's requirements.
    http://eleflow.com/
     
    Last edited: Jan 12, 2019
  7. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    Why would you buy transistors without knowing what they were?:)
     
    N1DQQ and N3AB like this.
  8. WB5WPA

    WB5WPA Ham Member QRZ Page

    @W9RAS Bob, we're still curious what it was you bought. Any chance of a picture? Pencil sketch? A verbal/written description even?
     

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