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Function
- Ballast
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- Beam power amplifier
- Diode
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- Triode tetrode
- Triode twin pentode
- Triple diode
- Triple diode triode
- Triple triode
- Tuning indicator
- Twin diode twin triode
- Twin pentode
- Voltage regulator
- Type
12AX7 / ECC83
Top of the line audio tubes manufactured by Penta Laboratories in China. These fine miniature glass 9 pin double triode amplifier tubes come with short gray plates and chrome tops. Suitable for all audio applications, these fine tubes are printed in yellow with Penta Laboratories logo, 12AX7 PENTA LABORATORIES, MOORPARK CA, U.S.A. MADE IN CHINA, and coded 2239. Boxes are standard Penta Laboratories yellow and black printed 12AX7 PENTA.
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