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500 Vcc comp. pair

Discussion in 'Electronic Design' started by Louis Kendall, Jun 28, 2007.

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  1. I normally use MJE 340/350 for HV power amps but they are only good to
    300V. This time I am running 450-500V rails.

    What is the next logical step up in voltage using the most commonly
    available part, and preferrably not TO-3?

    Desired bandwidth is 10KHz to 2MHz.

    Thanks for any advice.

    Louis Kendall
  2. Phil Allison

    Phil Allison Guest

    "Louis Kendall"

    ** A noval or octal base valve is good at those voltages.

    Triode or pentode......

    ** Consider mosfets.

    600 and 800 volt ones are common.

    ......... Phil
  3. Boris Mohar

    Boris Mohar Guest


    Boris Mohar

    Got Knock? - see:
    Viatrack Printed Circuit Designs (among other things)

    void _-void-_ in the obvious place
  4. Wimpie

    Wimpie Guest

    Hi Louis,

    I don't know exact details about your current topology. If you can use
    a topology that uses NPN transistors only (or N channel MOSFETS), you
    can use high voltage deflection transistors (for CRT monitors/
    television) or high voltage IGBTs.

    I can imagine that this doesn't solve the bias issues, so probably
    there will be some trade-offs. In case of BJT's, bias current will be
    higher because of low HFE.

    Also current sources (with PNP) require different design (series

    Best regards,

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