Motorola PA information needed

Discussion in 'Radio Circuits, Repair & Performance' started by CX4BBD, Feb 22, 2012.

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  1. CX4BBD

    CX4BBD Ham Member QRZ Page

    Good Evening folks

    I got this PA a few weeks ago in a hamfest but couldn't find any information. It had a sticker saying "Motorola 6 mts. Power Amplifier" and that was it (please see attached pictures)
    I am building a 6 mts. transverter and looking for the possibility of using this one as an amplifier.
    I would appreciate any help.

    Thank you in advance and have a good day :)

    Aldo CX4BBD

    Attached Files:

  2. KB1ILS

    KB1ILS Ham Member QRZ Page

    Looks to me like the RF section of an older mobile radio, perhaps a Syntor. Looks older than a Maratrac.
  3. K9STH

    K9STH Ham Member QRZ Page

    Looks like a Micor to which someone has added an additional heatsink.

    This amplifier is only good for CW or FM/PM since it runs Class "C". Definitely not suitable for use where a true linear amplifier is needed (i.e. SSB or AM).

    Glen, K9STH
  4. K1ZJH

    K1ZJH Ham Member QRZ Page

    Looks like a GE Mastr Pro to me :) That board shows a GE part number, and those aren't Motorola in-house transistors.

  5. KB1ILS

    KB1ILS Ham Member QRZ Page

    That is exactly what my initial impulse was! I have a Delta SX and it looks very similar. But I went with the Motorola assumption...
  6. W9GB

    W9GB Ham Member QRZ Page

    The Heat-sink design is GE MASTR series .. this unit has been pulled and modified.
    Identical castings to a 110 watt VHF GE MASTR II mobile unit that I have in garage
    This may have come from a mobile unit or a rack-mount repeater radio.

    The 9-pin test-set connector (black plug-in connector in photo) is same one used for the GE MASTR II,

    Motorola did not use this style of connector and the GE MASTR-PRO series used a different style of test-set connector !!
    The MASTR PRO was also a Hybrid PA design using vacuum tubes for drivers and final PA tube.

    GO TO Repeater Builders TIP, and use that GE part number: PL19xxxx

    They should be able to quickly Cross Reference to GE Manuals, specifications, etc.

    Last edited: Feb 22, 2012
  7. CX4BBD

    CX4BBD Ham Member QRZ Page

    Good Evening guys

    Thank you for all the information you guys provided me. I remember an old GE VHF transceiver that I had several years ago with a heatsink very similar to this one.
    So now I have a much better view on where to direct my search, a GE Mastr II. I was looking at the Repeater Builder site before posting, by the way a fantastic site, but not on the right spot :(

    One more time: I really and greatly appreciate all your help ;)

    Aldo CX4BBD
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