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DeWald R5000

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  • DeWald R5000

    Hi,new to tubes but do have basic skills in electronics. working on this amp and on the schematic its showing 45 volts on the 12ax7 plate. I am confused, everywhere I look the specs range around 3-400 volts. is it a misprint or am i missing something. I would be gratefull for any help. I attached schematic . radiomuseum-dewald-radio-mfg-l-5000-troubadour-770995.pdf

  • #2
    Input 12AX7 plate voltages are low because they are supplied by only around 70V B+.and the plate voltage in a gain stage always must be lower than the supply voltage.
    They will work nevertheless.

    Plate voltages in tube specs are typically limiting values.
    - Own Opinions Only -

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    • #3
      ok thanks. I have some resistors with broken leads so i am waiting for new ones to come in then I can actually measure plate voltage to see if it is close to the schematic. Thanks again

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