FULLMUSIC Electronic tube 211, gold feet with ceramic base, gold-plated tube base, graphite screen, Direct replacement of 211 electronic tubes of vari

Introduction:
"Huangzhonghuang" 845,211,805 series
1. Fullmusic ensures the reliability and stability of the product. The cathode uses imported thorium tungsten wire material, and adopts the mature and reliable "carbonization" process of large tube produced by Beijing Electron Tube Factory for decades to ensure the quality of the cathode as the heart of the electron tube reliable.
2. In the design of the die, the improved structure adopts a cantilever hook-type combined cathode to obtain rich harmonic content and achieve the effect of improving sound quality. The grid adopts gold-plating process for precise winding.
3. The combination screen using graphite material eliminates the spark noise when the screen is working, resulting in a clean music background when the tube works.
4. Improve the matching method between the glass shell and the die to make the die firm and reliable.
5. In summary, it is not difficult to see that under the guidance of innovative ideas, Tianjin Quanzhen Factory has highlighted design innovation and process innovation, constantly innovating, and creating super first-class medium-power electronic tubes. The electronic tube has good performance and consistent parameters. It can be free from pairing during use. The materials used are all high-purity vacuum materials with good performance and scientific materials to ensure that the "in-tube vacuum" and cathode are not contaminated.

Classification- Dome-type bulb of glass, filametary of carbennation Th-w a copper ceramic base with four-prong bayonet golden pins, carbon plate triode.
Application -Audio power amplifier Class A or Class B or Class C.
Dimensions -Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1 and 2.





 

Nominal operating conditions and parameters
Filament voltage ................................... 10V
Nominal filament current ...................  3.2A
Plate voltage ......................................... 1250V
Grid voltage ........................................  -70V
Plate current .........................................100mA
Amplification factor ............................. 12
Load resistance ................................   7 k
Output power ........................................10W
Grid to plate transconductance ....... 3.8mA / V

Suggest Operating conditions and parameters
Class A power amplifier of single tube (A-F)

Characteristics-Average characteristics
Figure 3. Shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply. 


Limiting Operation Conditions for Safe Nor simultaneous ratings