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  1. #1

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    Default KT66 in an EL34 amp?

    I have a class AB push pull manually adjustable bias amplifier that is currently running EL34 tubes. The question is, can I run KT66 or 6L6 tubes in this amp? The B+ measures 440V DC. I'm considering a used quad of Gold Lion KT66 tubes.

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    what does the manufacturer say?
    JC approves....he told me so. (F-1 nut)

  3. #3
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    What is the amplifier? Usually those types of output tubes are not exchangeable in most circuit designs.

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    The manufacturer no longer exists. This is a product of China. There is someone in Europe (affordable valve company) that was buying these amplifiers from China and adding upgraded capacitors and gold plated terminals then doubling the price, but he is not responding to E-mails. The Unit is a V.A.L. VP-110S. The guy in Europe had them labeled as T.A.C. 34 amplifiers, and they were also sold under the Vincent audio name. I know that EL34, 6CA7, & KT77 tubes can be used, but I wasn't sure about the KT66 & 6L6 variants. I am completely new to tube amplification, and I don't want to toast the output transformers or destroy a new set of tubes by doing the wrong thing.

    Here is my initial thread with a photo of the amp:
    http://www.polkaudio.com/forums/show...light=el34+amp

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    I saw a thread somewhere with the same question.Cannot remember the amp,, but I might suggest this if you want to be sure that you are not overtaxing the trannies/tubes

    http://tubedepot.com/bt-bias-scout.html
    JC approves....he told me so. (F-1 nut)

  6. #6
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    Hello,
    No they have a completely different pin configuration, the EL34 is an 8EP and the KT66 is a 7AC type pin setup.
    Regards, Ken

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