A15MK1 Voltage problem

    Hi there,
    I've just built an A15Mk1 amp and I was trying to debug it because the one I've built it is too noisy (according to me).
    I started trying to verify the voltages...all voltages seems ok (+- 5 or 7% ) but the voltages in the schematic in SW3a Boost are completely wrong ( I have 0.1 mV instead of 3.5V and 2.1V)
    something simialar happens for Voltages on pin 6 on V3a tube...I have 113V that is ok, but in the schematic there are also 45V and 25.4V don't know how they come out because no resistor or capacitor between 113V and 45V and 25.4V) and I don't have that voltages...
    I'm referring to schematic Rev 1.4 sheet 1 of 2!
    Now...probably I'm doing something wrong with measures...could someone explain how to do that?
    how the voltages in SW3a boost are measured? against ground? How are the switches positions? what does mean a green voltage on the schematic? sorry for this silly question but I'm a novice...
    Thanks a lot for your help that is really apreciated.
    Kind regards.
    Krusty

    Re: A15MK1 Voltage problem

    okay let´s begin with the boostswitch...

    there are no voltages! I don´t know where you get this information from...your 0,1mV are totally right around the boostswitch!

    by the way; voltages are measured to ground reference.

    Zitat

    I have 113V that is ok, but in the schematic there are also 45V and 25.4V don't know how they come out because no resistor or capacitor between 113V and 45V and 25.4V) and I don't have that voltages...

    I don´t get that....113V at the anode of V3a is perfect....there are no voltages like 45V and 25.4V

    Crank it!

    Re: A15MK1 Voltage problem

    Hi Krusty,
    sorry for the voltages printed in colors in the schematic, these are AC signal voltages from my prototype, please ignore them. I've just corrected the manual and schematic, so the actual english version is now 1.4a ;D
    Regards,
    Martin

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