Vacuum Tubes

National Union Electronic Tube - 2X2A Tube, electron.

Base: heavy 4 Pin.

The 2X2A is an EHT half wave rectifier

Ken-Rad - 6SH7 - Electron Tube, Removed from Equipment

The 6SH7 is a sharp cut-off amplifier pentode designed for use as a high-gain radio-frequency or intermediate-frequency amplifier.

8-Pin Round

Very Good Condition

Made in the USA

Used / Removed from Equipment

Heintz & Kaufman LTD - 54 - Tube, Electron. Gammatron.

The Gammatron HK54 from Heintz & Kaufman dates from the late 1930's and was designed for use as a VHF transmitter Power amplifier. The tantalum anode has a 50 Watt dissipation and the maximum anode voltage is 3,000 V. The anode will glow cherry red at full dissipation.

General Purpose Triode (HK-54), Tantalum Plate Transmitting Tube.

Base: UX-Base (4 Pins (2 thick, USA 1924, UX) Sidecontact and top contact.

Was used by: Transmittertube (Radio)

Filament: Vf 5 Volts / If 5 Ampere / Direct

Base: 4 Pin, 35mm d x 29.0mm deep.

Similar to 4C25 CV707

Dimensions: Glass tube 51.0mm D x 85.0mm high plus top contact.

Additional Information on H&K: https://www.foundsf.org/index.php?title=H%26K_and_Eimac;_an_Indigenous_Vacuum_Tube_Industry_Emerges

Historic Rare Electron Tube to Find

Vintage - New Old Stock

Made in the USA.

General Electric - GL-872-A/872 - Tube, Electron.

Half Wave Mercury Rectifier Tube.

Base: 4 Pin, 1.857" (47.1mm) D x 1.415" (35.9mm) high.

Dimensions: Glass Tube: 2.242" (56.9mm) D x 6-11/16" long including top contact.

Made in the USA

General Electric - 8136 - Tube, Electron.

Status: Discontinued

The 8136 is a beam tetrode from the American General Electric corporation but is referred to as a pentode.

Low Noise Audio Receiver Vacuum Tube. 

6.3V 0.3Amp.

Base: B7G, 7 Pin.

Thin Glass tube envelope is 18 mm in diameter and 47 mm tall. 

Genuine General Electric - Factory New old Stock.

Note: Tektronix 157-0082-00.

Alternate: 6DK6

Made in USA

Applications: Wide-band radio-frequency or intermediate-frequency amplifier in television receivers.

EIMAC - JAN-CIM-100TH  Tube, Electron.

Modulator Oscillator Amplifier - 100 Watt

High-Mu Power Triode for Radio Transmitters

Upper and lower cathods are Uranium Glass.

White ceramic base platinum grid

Base: 4 pin, 34.7mm D x 28.1mm high.

Dimensions: Glass Tube 3.066" x 6-1/8" long plus base.

Proudly Made in the USA.

Modulator Oscillator Amplifier Tube. Radial beam power tetrode. Filament: Thoriated Tungsten. Voltage: 5V. Current: 6.5Amp. Application: For use as an amplifier, oscillator, or modulator. Maximum plate-dissipation 125 Watt. Maximum plate-voltage 3000V (3KV) at frequencies up to 120 Mc. Base: 5 pin metal shell. Dimensions: 2.75" D x 5.69" long. Note: ALT P/N: RMA 4D21. Made in the USA. New In Mfg. Box.

Additional information at http://tubecollectors.org/eimac/archives/4125a(47).pdf