EECTECH also supplys tube socket / tube base / tube holder for 212, 212E, WE212, optional.
212 - metal anode audio tube
212E - carbon anode audio tube
they are equivalents to WE 212, WE212
Please choose your model or leave us message when place the order, thank you.
IF THE ORDER QUANTITY MORE THAN 2 PCS, PLEASE CONTACT EECTECH FOR A LOWER SHIPPING CHARGE.
212 type vavle is directly heated glass shell structure type thorium tungsten carbide natural cooling cathode triode.the anode maximum disspation power is 400W.the working frequency is 4.5MHz,when the frequency is not higher than 1.5MHz,c class cable state output power is 400W.
212 & 212E tubes is suitable for audio amplifiers for low-frequency power amplification, as well as for oscillation and amplification in radio frequency oscillation.
Carton dimensions: 420*420*680mm/ pc
General characteristics
Filament Thoriated Tungsten
Filament voltage: 14V
Filament current: 6A
Average Thermionic Emission 4A
Average Direct Interelectrode Capacitances
Plate-- Grid: 18.8 μμF
Grid----Filament: 14.9 μμF
Plate-----Filament: 8.6 μμF
Average Characteristics at 2000 volts direct plate potential and minus 90 volts grid bias
Amplification Factor 16
Plate Resistance 1900Ω
Grid to Plate Transconductance 8500μΩ
Mechanical properties:
Quality: (approximately) 0.8Kg
Installation: vertical or horizontal mounting, if mounting horizontally the plane of the filament , should be vertical.
Cooling: natural cooling
The maximum anode DC voltage: 3000V
Maximum Anode DC Current: 350mA
Maximum anode dissipation power: 275W
Maximum Direct Grid current 75mA
Maximum RF Grid current 5A
Maximum Frequency for the above ratings 1.5MHz
Maximum Plate Voltage for Upper Frequency Limit of 4.5MHz 1000V
Maximum Plate Voltage for Frequencies between 1.5 and 4.5MHz in proportion.
The above are maximum ratings which do not apply simultaneously but depend on the type of service as specified below.
Class A Audio Amplifier or Modulator
Direct plate voltage 1500 1250 V
Grid bias -57 -40 V
Grid Plate Volage 170 200 mA
Plate Dissipation 250 250 W
Load Impedance 5000 3000 Ω
Undistorted Output 50 40 W
Grid Bias Modulator
Direct Plat Voltage 3000 V
Grid Bias -260 V
Plate Dissipation 175 W
Load Impedance 8000 Ω
Peak Power Output 200 W
Class B Audio Amplifier or Modulator for balanced tube circuit
Direct Plate Voltage 2000 1500 V
Grid Bias -105 -75 V
Dierect Plate Current per tube No drive 40 50 mA
Maximum Drive 300 300 mA
Plate Dissipation 250 250 W
Load Res. Plate-to - Plate 8000 5900 Ω
Load Res. Per Tube 2000 1475 Ω
Approx Maximum Output 650 500 W
Recommended Power for Driving Stage 50 50 W
Class B Radio-Frequeny Amplifier
Direct Plate Voltage 2000 1500 V
Direct Plate Current 300 300 mA
Plate Dissipation 275 275 W
Grid Bias -120 -90 V
Approx. Carrier watts Use wth 100% Modulation 200 150 W
Class C Radio-Frequency Oscillator or Power Amplifier- Unmodulated
Diret Plate Voltage 2000 1500 V
Direct Plate Current 300 300 mA
Grid Bias -185 to -250 -150 to -200 V
Nominal Power Output 400 300 W
Class C Radio- Frequency Amplifier Plate Modulated
Direct Plate Voltage 1500 1000 V
Direct Plate Current 300 300 mA
Grid Bias -200 -125 V
Maximum Direct Grid Current 75 75 W
Nominal Carrier power output 300 200 W
for us with 100% modulation
Exquisite workmanship, high-class 212 / 212E / WE212 / KR1610 socket, optional
Matching boutique custom 212 / 212E tube socket： Click buy
Material：
Tube socket base: Brown red bakelite
Tube socket body: Aluminum Alloy, Titanium Gold Plated
Material of Pins:Phosphor bronze, 3U" thickness Gold Plated
For delivery time:
Generally, we will dispatch the items within 7 days upon order confirmation; some items may need 15~21 days to get ready for delivery, then we will try our best to dispatch as soon as possible, or we will contact you and offer advice.
For Bulk order:
If you would like to place a bulk order, please contact us for better price and better delivery cost.
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