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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.

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