? about tubes ,might be apples and oranges

infrared
infrared Posts: 21
in 2 Channel Audio
I was having a talk w/ a guitarist friend of mine and we had a major disagreement. He's a Clapton freak and said he used KT-66s in his Marshall stacks and I always thought they were 88s. They did change to 88s later on to out power Hendrix. Now our side of audio I went to the McIntosh pages for giggles and 88s were their primary output tubes and 12au7s and 12ax7s for preamp stages. My question is the KT-66s interchangeable w/ home tube amps or the 88s are just more powerful and that's why are used. Another minor question why do the English call tubes valves? I guess because they also drive on the left.....

http://proguitarshop.com/andyscorner/tone-tips-the-mighty-kt88

http://gpatt.customer.netspace.net.au/cream/loud_and_louder3.htm

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  • mhardy6647
    mhardy6647 Posts: 33,802
    edited November 2014
    The term "valve" was originally used very widely -- the idea is that a vacuum tube acts as a valve for the flow of current (which it does).

    I cannot tell you much about the "kinkless tetrodes" (KT-xx) -- I don't much care for them as hifi output tubes, personally. They are, I think, lineal descendants of the EL34, which was a beam power tube. I think that the only way to get more output power out is to increase the plate voltage... but I could easily be wrong about that.

    Here's a little bit on the beam power tubes and the kinkless tetrodes...
    http://www.r-type.org/static/grid14.htm

    EDIT: aha, here's the scoop! :- )

    http://web.archive.org/web/20050317085639/http://schema.web1000.com/tech.data/6l6.txt

    Elements_in_Vaccum_Tubes_Ghir_55.png

    EDIT^2: You may be able to download the PDF version of VTV issue #4 from this legacy link & read the original Eric Barbour article on the history of the 6L6 and its descendants: https://web.archive.org/web/20131122141326/http://www.jumpjet.info/Pioneering-Wireless/eMagazines/VTV/VTV04.pdf
    Post edited by mhardy6647 on
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  • marvda1
    marvda1 Posts: 4,901
    the kt-66 tube is in the 6l6gc/5881 power tube family, it is not in the kt-88/6550 or the el34/6ca7/kt77 families.
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