This is a pair of used Silvertone long plate 12AX7/ECC83 vintage amplifier tube.

Test readings:

Tube 1a - Gm: 1.7mA/V     Ia: 1.2mA

Tube 1b - Gm: 1.7mA/V     Ia: 1.2mA

Tube 2a - Gm: 1.6mA/V     Ia: 1.2mA

Tube 2b - Gm: 1.7mA/V     Ia: 1.1mA

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