ECC83 (12AX7) are miniature dual triodes sharing the same nine-pin envelope and heater arrangement, but differing significantly in electrical characteristics. Typical published parameters are summarized below.

Plate characteristics

The plate-characteristic curves of the ECC81, ECC82, and ECC83 show systematic differences corresponding to their amplification factor and internal plate resistance. Tubes with higher amplification factor exhibit greater horizontal displacement of the grid-voltage families

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