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TX Four Hundred amplifier

Discussion in 'Amplifiers' started by 795htx, Jul 29, 2018.

  1. 795htx

    795htx Member

    Aug 6, 2017
    Likes Received:
    I got this amplifier recently listed as a 4 pill and I've done a little bit of research but can't find anything on this particular model.
    I have found information on tx800 but not much else. I went ahead and took the cover off and turns out it's a 1 x 4 all mrf454 transistors. It's very obviously been tinkered with/ repaired with new resistors here and there and mismatched switches.
    If anyone could tell me when/where it was made, how much power to drive it with and what I could expect to see out of it I'd greatly appreciate it. It will be going in my truck with a president McKinley and a predator 10k. IMG_20180729_152042.jpg IMG_20180729_152100.jpg IMG_20180729_152144.jpg


  2. Tallman

    Tallman W9WDX Amateur Radio Member, KW4YJ EXTRA class

    May 1, 2013
    Likes Received:
    It looks like an amp that was at a repair facility and they did not know what was wrong with it and just started adding wire until it almost works. Good luck with fixing it.
  3. Ranch55

    Ranch55 Well-Known Member

    Jan 18, 2016
    Likes Received:
    That looks nasty.
    It can be fixed up, but will take some time and work.
  4. psycho

    psycho Running a special on our rooms!

    Aug 25, 2006
    Likes Received:
    Brand new, those amps work great but assembly wise they were quite cramped inside.

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