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Thread: ten tec corsair 11

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  1. #1

    Default ten tec corsair 11

    Hi i have this ten tec corsair 11 hf rig that is in need of new transisor finals and i am looking for how to remove the old ones the right way before i try .

    The transistors are MRF458 and they are soldered in .

    Any help please !

    Thanks ,

    Steve VE3SMY

  2. #2


    It's actually a Corsair-II, not 11.

    I didn't look it up but these power transistors are almost always 4-tab devices, with one tab for the base, one for the collector, and two for the emitter and they're bolted in place with machine screws (usually Allen hex type) down to the heatsink immediately beneath them.

    Does that describe what you have?
    What if soy milk is just regular milk introducing itself in Spanish?

  3. #3
    Join Date
    Feb 2002
    Ponied up to the Bar, with an umbrella in my drink.



    First off, contact Ten-Tec Service. They can provide some technical assistance, parts (not all parts are still in stock... it is a 25+ year old rig... and some can be obtained from other sources cheaper) and advice. I don't know if they still work on Corsair II's, to be honest, but I know they did up until fairly recently.

    Second, do you have the manual? If not, check the Ten Tec web site, under obsolete manuals. I think you can still download it -- for free.

    Third, try this great resource, the Ten Tec Wiki pages:

    Fourth, check in to the Ten Tec email reflector, hosted on the site. You'd be amazed at all of the help that you can get there.

    Good luck!
    Quando Omni Flunkus Moritati

  4. #4
    Join Date
    May 2005


    Remove two socket head screws per device. Unsolder four leads keeping track of which lead position is the one with the diagonal cut.

    You can buy replacement parts at:

    Remove the old thermal compound and place a very thin layer on the new devices. Bolt them in place and resolder the connections. Discard bad devices in hazardous waste collection. These devices contain BeO so use appropriate caution.

  5. #5


    I took a moment to look up the MRF458 and see it was offered two ways: With two machine screws and a flat base for mounting, or with a #10-32 stud for mounting.

    Either way, there's hardware involved. What's in the Corsair-II?
    What if soy milk is just regular milk introducing itself in Spanish?

  6. #6
    Join Date
    Mar 2003
    3763 Lyle Avenue, North Pole, AK 99705


    It's a good idea to use eutectic solder for these...AND an adequately sized soldering gun. You can do a LOT more damage to a transistor with an anemic soldering iron. You want to get things up to temperature FAST and then get out of there quicklyl!

    "A minute of measurement trumps a decade of debate."

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