What are the functions of each of the 5 grids of a Pentagrid Converter tube starting at the grid closest to the cathode in its use in a Superheterodyne Radio?
There are three varieties of pentagrids.
Initial type - 6A7 type (converter).
Grid 1 - oscillator grid,
Grid 2 - oscillator anode,
Grid 3 - screen grid,
Grid 4 - signal grid,
Grid 5 - screen grid.
Development - 6SA7/1R5 type (converter).
Grid 1 - oscillator grid,
Grid 2 - screen grid,
Grid 3 - signal grid,
Grid 4 - screen grid,
Grid 5 - suppressor grid.
Development - 6L7 (mixer).
Grid 1 - signal grid,
Grid 2 - screen grid,
Grid 3 - oscillator injection grid,
Grid 4 - screen grid,
Grid 5 - suppressor grid.