ten tec corsair 11

Discussion in 'Ham Radio Discussions' started by VE3SMY, Feb 19, 2013.

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  1. VE3SMY

    VE3SMY Ham Member QRZ Page

    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. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    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?
  3. W3WN

    W3WN Ham Member QRZ Page


    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: http://tentecwiki.org/doku.php?id=home

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

    Good luck!
  4. WB3BEL

    WB3BEL Ham Member QRZ Page

    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. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    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?
  6. KL7AJ

    KL7AJ Premium Subscriber QRZ Page

    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!

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