a help for M15Mk1 voltages

  • Hi,
    I need a help to find out why I have good values almost everywhere except for V3:


    tube pin--- my value------- schematic value
    6 -..............245v -...........206v
    1 -..............87v -............204v
    3 -..............83.9v -..........56v

    between R20 and R19 - 81.6v insted of 55

    Thank you

    4 Mal editiert, zuletzt von baol (23. Juni 2017 um 19:32)

  • Hi and welcome to the forum. Sorry for the late reply but I'm not in the forum every day and hoped otgher knowledgeable people would help you ;) If you still measure the same (wrong) values, please do the following:
    1) What is the voltage at + of C18 (should be 267V)?
    2) What is the voltage at pin 8 of V3 (should be the same as at pin 3)?
    3) What is the voltage at the connection of R19 and R22 (should be 55V)?

    Assumed the tube is not broken (did you switch V3 with V2 to test that?) is must be the circuit connected to V3. Please check the wiring of R17/R18, R19-R22 and C14-C17 - not only compared to the wiring schema but also compared to the schematic.

    Regards,
    Martin

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