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Your position: Home / Audio/HiFi accessories / Audio tubes / Hifi tubes

212 audio tube, hifi tube, China vacuum amplifier tube equivalent to 212E, ML-212E, WE212 hifi tubes

EAT07002
212 and 212E China audio tubes, suitable for audio amplifier for low frequency power amplifier,oscillation
also could be used in the rf oscillator amplifier.
Price:
USD
$1057.47
$1363.50
Wholesale:
4+
$969.60
    Please select the information you wantX
  • Model:
    212- metal anode
  • Model:
    212E carbon anode
Quantity:
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(53 available)
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  • Description
  • Reviews(8)
212 - metal anode audio tube
212E - carbon anode audio tube
they are equivalents
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.

The tube 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




 
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.
 
 
 
Average rating: 5.0 based on 8 reviews
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