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    Wattage ratings of Mark3 resistors

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    garyb

    Posts : 3
    Join date : 2011-01-06
    Location : Iowa

    Wattage ratings of Mark3 resistors

    Post by garyb on Thu Jan 06, 2011 4:16 am

    Hi, new guy here, I am ordering parts for Mark 3 boards. What are the resistor ratings? Another question, the instructions that came with my boards specify 12AT7 while the Mark 3 order page specify 12AU7 tubes.
    Thanks

    Bob Latino
    Admin

    Posts : 2411
    Join date : 2008-11-26
    Location : Massachusetts

    Re: Wattage ratings of Mark3 resistors

    Post by Bob Latino on Thu Jan 06, 2011 6:11 am

    Hi,

    If you mention 12AU7 tubes and 12AT7 tubes then you must mean the VTA Mark III upgraded driver board.

    The standard gain board which uses 12AT7 driver tubes uses all 1/2 watt resistors.

    On the lower gain board which uses 12AU7 or 12BH7 driver tubes most of the resistors are 1/2 watt except ..

    R16 is a 1 watt resistor
    R18 is a 2 watt resistor
    R20 and 22 are 2 watt resistors
    R12 and R14 are 2 watt resistors

    Bob

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