Because of its ability to provide superior quality audio power amplifier tubes at competitive prices, while maintaining the highest standards of service, Penta Laboratories has become a valued resource for an ever-increasing number of independent and public radio and TV stations and operators. Moreover, each TV and radio vacuum tube and amplifier is extensively tested prior to shipment to ensure that optimum levels of on-air performance will be maintained. Penta power grid tubes and cavities are available for all broadcasting requirements, as are klystrons and millimeter-wave power amplifiers.

This is only a partial list of the products that Penta Laboratories typically carries, please contact us directly to inquire about other tube types.

  • 3-500ZG

    The Penta Laboratories 3-500ZG vacuum tube for sale is a high-mu power triode with a maximum plate dissipation rating of 500 watts. Cooling is by radiation and forced air through the base, along the envelope, and over the plate seal and radiator-type plate connector. This 3-500ZG replacement tube is intended for use as a zero-bias Class AB2 amplifier in radio-frequency or audio frequency applications. By eliminating the bias supply, zero grid bias operation greatly simplifies circuitry design. When operated in a cathode-driven circuit, a power gain of as much twenty times is achievable. Featuring a new design for longer life, the ceramic base provides better temperature control.

    $275.00
  • 3-500ZG Matched Pair

    The Penta Laboratories 3-500ZG is a high-mu power triode with a maximum plate dissipation rating of 500 watts. Cooling is by radiation and forced air through the base, along the envelope, and over the plate seal and radiator-type plate connector. These two matched pair of vacuum tubes are intended for use as a zero-bias Class AB2 amplifier in radio-frequency or audio frequency applications. By eliminating the bias supply, zero grid bias operation greatly simplifies circuitry design. When operated in a cathode-driven circuit, a power gain of as much twenty times is achievable. Featuring a new design for longer life, the ceramic base provides better temperature control.

    $550.00
  • 3-500ZG Matched Quad

    The Penta Laboratories 3-500ZG is a high-mu power triode with a maximum plate dissipation rating of 500 watts. Cooling is by radiation and forced air through the base, along the envelope, and over the plate seal and radiator-type plate connector. It is intended for use as a zero-bias Class AB2 amplifier in radio-frequency or audio frequency applications. By eliminating the bias supply, zero grid bias operation greatly simplifies circuitry design. When operated in a cathode-driven circuit, a power gain of as much twenty times is achievable.

    $1,100.00
  • 3-500ZG Matched Trio

    The Penta Laboratories 3-500ZG is a high-mu power triode with a maximum plate dissipation rating of 500 watts. Cooling is by radiation and forced air through the base, along the envelope, and over the plate seal and radiator-type plate connector. This vacuum tube set is intended for use as a zero-bias Class AB2 amplifier in radio-frequency or audio frequency applications. By eliminating the bias supply, zero grid bias operation greatly simplifies circuitry design. When operated in a cathode-driven circuit, a power gain of as much twenty times is achievable.

    $825.00
  • 3CX10,000A3

    More information coming soon.

  • 3CX10,000A7

    The Penta Laboratories 3CX10,000A7 amplifier tube for sale is a ceramic and metal power triode intended to be used as a zero-bias Class-B amplifier in audio or radio-frequency applications. Operation with zero grid bias offers circuit simplicity by eliminating the bias supply. In addition, grounded-grid operation is attractive since a power gain as high as twenty times can be obtained with the PL8160/3CX10,000A7.

    $2,199.95
  • 3CX15,000A3

    More information coming soon.

  • 3CX15,000A7

    The Penta Laboratories 3CX15,000A7 for sale is a ceramic / metal power triode intended for use as a zero-bias Class rf amplifier or Class C power amplifier or oscillator. Class B operation with zero grid bias offers circuit simplicity by eliminating the bias supply. In addition, grounded-grid operation is attractive since a power gain as high as twenty times can be obtained with the 3CX15,000A7.

    $2,399.95
  • 3CX1500A7

    The Penta Laboratories PL8877/3CX1500A7 amplifier tube for sale is a rugged ceramic and metal power triode designed for use as cathode driven Class AB2 or Class B amplifier in audio or rf applications, including the VHF band. It can also be used as a cathode driven plate modulated Class C rf amplifier. As a linear amplifier, high power gain may be obtained without sacrifice of low intermodulation distortion characteristics.

    Low grid interception and high amplification factor combine to make the PL8877/3CX1500A7 drive power requirements exceptionally low for a tube of this power capacity.

    $1,149.99

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