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ECH21 Triode, Heptode Tungsram Vacuum Electronic Tube

This is an original, Tungsram ECH21 Triode, Heptode electronic tube. Good subtitute is the ECH71, UCH21 - different filament voltage. This tube is designed for RF [Radio Frequency] but useable in AF [Audio Frequency] circuits. A heptode or a triode is useful for many other special purpose circuits like oscillators, RF amplifiers, multivibrators, blocking oscillator, replacement part, circuit research and experimentation or for antique radio, instrument, TV television restoration projects or to set up a private vacuum tube museum. It is NOS tube - New Old Stock, unused, without box, excellent condition.
ECH21 Triode, Heptode Tungsram Vacuum Electronic Tube [16 KB]


Triode, Heptode
RF & AF Amplifier, Oscillator, Mixer
MFG: Tungsram High quality Made in Hungary
Heater: 6.3 V, 0.33 A Substitute: UCH21
Plate: 175/300 Vmax - 0.8/1.5 Wmax Triode/Heptode
Base: 8-pin loctal (with center) - all glass


NOS - [New Old Stock] tube Without box
Unused - Price: $20 - One available
S/H included within continental US
ECH21 Loctal 8-Pin Miniature All Glass Vacuum Electronic Tube Electrode Connections
PIN # 1 2 3 4 5 6 7 8 Ctr
Electrode Heater Anode H Anode T Grid-1 T Grid-2,4 Grid-1 H Cath G3 G5 SH Heater Cath G3 G5 SH
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