The price is for 1 pair (2 pcs).  It is a direct thermal cathode power transistor for A1 type amplification. Adapted to the audio amplifier for output power requirements at 10W.  Filament heating  Uf (DC) .................. 5V  If (DC) ............... 1.2A  Static parameters  Ua ........................ 300V  -Ug ..................... 60V  Ia ........................ 60mA  Gm ........................ 5.5mA / V  ri ........................ 0.7...

Description：  Heater  Uf………………2.5V  If…………… 2.5A  Static Parameter  Ua……………………250V  -Ug………………… -45V  Ia……………………60mA  Gm……………………5.25 mA/V ...

Some precautions about using high voltage power tubes:  Unlike other vacuum tubes such as KT88 or EL34, which typically run at 450V plate voltage, high voltage power tubes such as 845, 805 and 211 run at plate voltage 900V or even higher depending on your amp design. Due to the high voltage in the circuit, biasing an 845 / 805 or 211 amp improperly may expose you to lethal high voltage causing instant death. If you haven’t owned any tube before, we recommend you not to start with a...

Specification:  2.2 Electrical parameters ---- Rating rating unit  2.2.1 Capacitance between electrodes  2.2.1.1 Input Capacitance 15.5 PF  2.2.1.2 Output Capacitance 8.4 PF  2.2.1.3 Cross-circuit capacitance ≤ 1.5 PF  2.2.2 Typical operating parameters  2.2.2.1 Hot wire voltage 10 V  2.2.2.2 Hot wire current 0.36 A  2.2.2.3 Anode voltage 135 V  2.2.2.4 Curved gate voltage 135 V  2.2.2.5 Control gate voltage -3 V  2.2.2.6...

PSVANE TUBE WR50 is direct-heated type thorium tungsten cathode triode, can be used as class A1 and AB1 amplification.  Typical operating parameter  Heater voltage 7.5 V  Heater current 1.25A  Ua 350V  Grid voltage -63 V  Ia 45 Ma  Internal resistance 4.1K  Amplification coefficient 3.8  Output power 2.4W 

UK-EL34 is a high-performance audio output pentode, its anode limited dissipation power is 25W. The output power is more than 10W when it is for Class A1 amplification as a single tube in audio amplifier.The output power more than 35W when it is for Class AB1 amplification.  

Classification-Dome-type or Aubergine-type bulb of glass, a white ceramic base with four-prong bayonet gold pins , oxide coated filamentary, solid plate, mesh plate, cabon plate triode.  Application-Audio frequency amplifier where power outputs of approximately 8.5watts or less is required at relatively low plate voltages.  Dimensions-Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1, 2 and...

Parameter：  Improved structure over the old Shuguang 805-T model for safe shipping  Wider diameter (2 1/2″) for stability and quick heat dissipation  Gold coated brass base to improve shielding to interference  Gold coated pins to enhance connection over long term  All parts are selected to the highest grade plus only highly experienced workers to assemble  Suggested burn-in time is 75 hours  Package size: 31cm x 31cm x 17cm, 2.2kg  Shipping...

274B Glass shell eight feet straight heat type full wave rectifier tube, and 5U4G, 5Z3P similar, can be used to swap. Filament heating: Uf: 5V If: 2.5A Limit rating Anode reverse voltage peak: 1550V Anodic peak current: 750mA Recommended work status Anode supply voltage 2 * 500V Impedance 75 per arm Load impedance 2000 Filter capacitor 4 F Rectified current is greater than or equal to 230mA

211 is directly heated triode thorium-tungsten cathode, can be used for A, B, C class power amplifier. Filament heating Uf: 10 V If: -3.25 A Electrode capacitance Input capacitance: 6 PF The output capacitor: 5.5 PF Cross-Road capacitors: 14.5 PF Static parameters Ua: 1250 V -Ug: --70 V Ia: 100 mA Gm: 3.8 mA / V u (when Ia = 75mA when): 12 RL: 7 KΩ Pout: 10 W Recommended work status (reference value) Class A single-tube amplification (A-F): Typical operating conditions limit parameters...