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What are these wires? (PI)

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  • What are these wires? (PI)



    Here is something I have drawn up in paint. It is an amp I looked at and drew the layout/schematic minus a few connections which I *thought* I could figure out later. V3a is a half-tube tremolo like a Princeton, V3b is the split-load phase inverter.

    What has me puzzled is the 2 wires coming off pins 7 and 8 (circled). I am still a newb at this, but for the life of me I can't figure out where they go/come from! They ran under the board and now the amp is gone. I normally build by just copying schematics but I don't fully understand all the sections or how they work.

    Any guesses?

    Thank you!

  • #2
    Paint PI Caricture

    If that is the phase inverter circuit, the two pins in question are Pin 7 (grid) & Pin 8 (cathode).
    Pin 6 (plate)is the top output (through a capacitor) to one output tube.
    Pin 8 (cathode) is the bottom output (through a capacitor) to the other output tube.
    Pin 7 (grid)is the input which would come from the previous stage (through a capacitor).
    Attached Files

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    • #3
      That helps a lot! Thanks

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