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    Bias KT88 versus 6550 WE

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    Skyfrog

    Posts : 6
    Join date : 2013-03-03
    Location : Raleigh, NC

    Bias KT88 versus 6550 WE

    Post by Skyfrog on Sun Aug 09, 2015 7:37 am

    Hi,
    This question was probably asked before but I cannot find this topic. I obtained some Sovtek 6550WE for my M125. Is there a difference in the bias value? Shall I just replace them and re-bias at 0.60/1.20 like the KT88?
    Thanks bunches.

    Bob Latino
    Admin

    Posts : 2414
    Join date : 2008-11-26
    Location : Massachusetts

    Re: Bias KT88 versus 6550 WE

    Post by Bob Latino on Sun Aug 09, 2015 8:28 am

    Hi,

    You would just bias a KT88 and a 6550 in your amp the same ... Just as you said > .60 VDC bias voltage per side for two output tube operation and 1.20 volts per side for four output tube operation. The recommended output tubes to use in an M-125 are 6550, KT88 and KT120. You could also use the newer TungSol KT150 BUT > I don't feel that the extra cost for these (they are about $100 a tube) is worth it ..

    Bob

    Skyfrog

    Posts : 6
    Join date : 2013-03-03
    Location : Raleigh, NC

    Re: Bias KT88 versus 6550 WE

    Post by Skyfrog on Sun Aug 09, 2015 9:57 am

    Thanks Bob.

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