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
  • 3CX2500F3

    More information coming soon.

  • 3CX3000A1

    More information coming soon.

  • 3CX3000A7

    The Penta 3CX3000A7 tube for sale is a high-mu metal/ceramic external anode power triode. Maximum plate dissipation for this tube is 4000 watts, and cooling is forced-air. At moderate plate voltages, relatively high power output can be obtained from the 3CX3000A7 tube for sale as an amplifier, oscillator, or modulator.

    For grounded-grid operation, excellent shielding between the input and output circuits is provided by the grid, handily terminated between the filament and plate terminals. A power gain of approximately 20 times can be obtained under operation with zero grid bias. The 3CX3000A7 amplifier tube for sale is designed using a rugged, lowinductance cylindrical filament stem, making it especially well suited for use in the linear filament tank circuit under VHF operation.

    $1,144.99
  • 3CX3000F7

    More information coming soon.

  • 3CX800A7

    The Penta Laboratories 3CX800A7 tube for sale is a compact power triode intended for use as a cathode-driven Class AB2 or Class B amplifier in rf applications including the VHF band. 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 3CX800A7 drive power low for a tube of this power capacity. A single 3CX800A7 will deliver 750 watts PEP and 750 watts key-down CW output power to 350 MHz. The 3CX800A7 replacement tube for sale is useful to 450 MHz. The anode is forced-air cooled for 800 watts of dissipation.

    $1,049.95
  • 3CX800A7 Matched Pair

    The Penta Laboratories 3CX800A7 tubes for sale are compact power triodes intended for use as cathode-driven Class AB2 or Class B amplifiers in rf applications, including the VHF band. 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 3CX800A7 drive power low for a tube of this power capacity. A single 3CX800A7 will deliver 750 watts PEP and 750 watts key-down CW output power to 350 MHz. The 3CX800A7 tubes for sale are useful to 450 MHz. The anode is forced-air cooled for 800 watts of dissipation.

    $1,900.00
  • 4-400A

    More information coming soon.

  • 4-400AX

    More information coming soon.

  • 4-400C

    More information coming soon.

  • 4-400CG

    More information coming soon.

    $249.99
  • 4CV100,000C

    More information coming soon.

  • 4CX10,000D

    More information coming soon.

  • 4CX10000D

    More information coming soon.

  • 4CX1000A

    4CX1000A Ceramic Vacuum Tube, Radial-Beam Power Tretrode, 1000W, 110 MHz,

    $849.99
  • 4CX15000A

    More information coming soon.

    $2,249.99
  • 4CX1500B

    The 4CX1500B/8660 tube is radial beam tetrode which is rated for 1500 watts maximum plate dissipation. Construction is metal/ceramic, and cooling is via forced-air. The high current, low voltage and low distortion design of the 4CX1500B/8660 makes it ideally suited for use in audio amplifier or Class AB1 RF linear amplifier applications. In addition, the 4CX1500B/8660 exhibits exceptionally low intermodulation distortion and low grid interception for a tube of its power output.

    $994.99
  • 4CX20000A

    4CX20000A/8990 is a high-performance ceramic/metal power tetrode designed for audio and radio frequency applications. It is particularly well-suited for use in VHF FM broadcast transmitters in the Band II 88-108 MHz frequency range.

    $3,994.99
  • 4CX20000C

    More information coming soon.

    $3,994.99
  • 4CX20000D

    4CX20,000D/9015 is a ceramic/-
    metal VHF power tetrode intended for use as
    a RF amplifier up to 110 MHz. It is particular –
    ly recommended for use in the 88-108 MHz
    FM band. It features an electromechanical
    structure which provides high RF operating
    efficiency and low RF losses. The 4CX-
    20,000D has a gain of up to 20 dB in FM
    broad-cast service. The anode is rated for 20
    kilowatts of dissipation with forced-air cool-
    ing and incorporates a highly efficient cooler
    of new design, which significantly reduces air
    pressure and flow requirements and produc-
    es low acoustical noise.

    $3,994.99
  • 4CX20000E

    The 4CX20,000E is a ceramic/metal power
    tet-rode vacuum tube intended for use as a VHF power
    amplifier. It features a type of internal
    mechanical structure, which results in rf oper-
    ating efficiency. Low rf losses in this structure
    permit operation at full ratings to 110 MHz.
    The 4CX20,000E provides high gain in FM
    broadcast service and is also recommended
    for rf linear power amplifier service, including
    IBOC digital transmission. The anode is
    rated for 20 kilowatts of dissipation with
    forced-air cooling and incorporates a com –
    pact, highly efficient cooler of new design.

    $3,994.99
  • 4CX2500A3

    More information coming soon.

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