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Need help with Power Transistor ID.

Discussion in 'Datasheets, Manuals and Component Identification' started by Robert132, Dec 30, 2017.

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  1. Robert132

    Robert132

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    Dec 30, 2017
    Got a Amplifier with what I think are Motorola Power Transistors, across the top it has 3800 and right under it says 8751 and under that it says MALAYSIA. Cannot find anything on the web about these transistors, are they obsolete and if they are what replaced them? Also would like to know what wattage they are, any help would be greatly appreciated. I went to rf parts and no help there.
     
  2. kellys_eye

    kellys_eye

    4,717
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    Jun 25, 2010
    Amplifier make/model?
    Schematic?
    Pictures?

    Our collective crystal balls are broken......
     
  3. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    Sir Robert132 . . . . .

    Seeing that you only give me Rotomola and the rf clue . . . . . . . . now I DO " NOES " my Rotomola but apparently their rep DOES NOT ! . . . I now give you . . . . . .

    upload_2017-12-31_10-31-53.png


    73's de Edd
     
    Last edited by a moderator: Jan 16, 2018
    davenn and kellys_eye like this.
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Edd has amazing balls (crystal, of course)
     
    kellys_eye likes this.
  5. kellys_eye

    kellys_eye

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    Jun 25, 2010
    8751 and 9110 are probably date codes (manufacture). 1987 and 1991 respectively.
     
  6. Robert132

    Robert132

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    Dec 30, 2017
    Have I stumped the Class.........The Amp is called a Commander 2 all transistor, plug in wall, has own power supply.
     
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Edd's answer wasn't sufficient?
     
  8. Robert132

    Robert132

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    Dec 30, 2017
    Well it's the right series, but is the wattage the same? Has anyone ever seen or heard of this Amplifier, there is no information on the web I can find out about it "Commander 2 Transistorized Base Amplifier " it has modulation lights and swr warning light also on it, right now swinging over a Thousand watts.
     
  9. davenn

    davenn Moderator

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    Sep 5, 2009
    well that is impossible., considering it is only a 50W transistor
    there must be other amplifier transistors inside if it to anything near 1kW

    please show an internal photo of the amp
     
  10. davenn

    davenn Moderator

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    Sep 5, 2009
    well there is some info on google, which would have been helpful to know in your opening post

    http://www.hellotrade.com/palstar-usa/commander-ii-1000-watt-2-meter-rf-amplifier.html

    so if it does indeed have a MRF492 in it, it must be getting used as a driver transistor, maybe ?

    again ... show photos
     
  11. davenn

    davenn Moderator

    13,991
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    Sep 5, 2009
    well didn't take too much of an effort to find this .......

    http://www.radiomanual.info/schemi/ACC_PA/Palstar_Commander_2_user.pdf

    OK so the that transistor doesn't even exist in that amplifier

    so time to find out from you what you are really talking about ????
     
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