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Biasing a 1974 Fender SF Twin Reverb Master Volume Push Pull Switch - Reading 13 mA

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  • #16
    The values of the screen voltages are just a quick way to tell if any of the screen resistors are blown.
    The main supply voltages will change a bit as you alter the idle current. If you checked the plate voltages you would see the same, it drops as the idle current increases. This is due to the loading of the supply.
    Originally posted by Enzo
    I have a sign in my shop that says, "Never think up reasons not to check something."


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    • #17
      got it loud and clear, Mr g1
      thank you all for your contribution to my knowledge

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