FULLMUSIC 845 electron tube, graphite screen gold foot, the latest new type ceramic base gold foot, tube base gold plating (one pairs)

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.

Features: It is a dome-shaped glass shell, four gold-plated copper porcelain bases, thorium carbide cathode, graphite plate electrode triode.
Uses: used in Class A1 and Class A1 power amplifiers.

Standard working status and parameters:
Filament voltage * ……………………………………………………………… 10V
Filament current .............................................................................. 3.2A
Plate voltage ………………………………………………………… 1250V
First grid voltage ............................................................- 200V
Plate current ........................................................................ 80mA
Magnification ........................................................................... 5.0
Transconductance ………………………………………………………………………… 3.0mA / V
Plate resistance …………………………………………………………………… 1.7kohms
Output power …………………………………………………………………… 15W
Load resistance …………………………………………………………………… 3.4kohms
Signal voltage (pk) ………………………………………… 69.0V
* AC filament power supply or DC filament power supply
** The AC filament power supply grid or plate circuit is connected to the secondary center of the filament transformer, the DC filament power supply, the grid anode power supply circuit is connected to the filament negative terminal.
 

Suggest Operating conditions and parameters
Class A1 power amplifier of single tube

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.

Limit working value:
Maximum plate voltage …………………………………………………… 1250V
Maximum plate power consumption ............................................................ 75W
Maximum plate current ……………………………………………………………… 120mA
Input power (maximum signal) ................................................... 150W