Tube pinout diagrams

preamp tube pinout

   Preamp tube socket diagram

  1. Anode/Plate 1 (first triode)
  2. Grid 1
  3. Cathode 1
  4. Heater
  5. Heater
  6. Anode/Plate 2 (second triode)
  7. Grid 2
  8. Cathode 2
  9. Heater tap

 

   Power tube socket diagram

power tube pinout

The notch on a power tube socket will be in between pins 1 and 8.

  1. Grid 3
  2. Heater
  3. Plate
  4. Grid 2
  5. Grid 1
  6. N.C.
  7. Heater
  8. Cathode