300B MESH PLATE AV5M ALESA VAIC Made in Czech Republic PAIR NOS tube valve lampe röhre tsf 진공관 真空管 FOR AMPLIFIER DIRECT HEATED MESH TRIODE FOR HIGH-END AMPLIFIERS: DRIVER FOR ALL POWER TRIODES FILAMENT Vf= 5 vOLT If= 1,3 AMPERE ANODE DISSIPATION MAX 15 WATT ; OUTPUT POWER MAX 5W RMS GLASS DESIGN C-37 ; MESH NiSC / SOFT CARBON / TECHNOLOGY ; SUPER LONG LIFE 40.000 HOURS ; HARD METAL CATHODE ; ULTRA HIGH VACUUM 10/-8 ; TORR, GRID CURRENT O,2uA AT FULL POWER ; SUPER LINEAR MESH PLATE , LOWERED THD , IMD AND VERY FINE SOUND WITH MORE MUSICAL DETAILS Ua MAX = 400 VOLT Ua TYP = 350 VOLT ; Ia mAX = 100 mA ; Ia TYP = 40 mA ; PLATE IMPEDANCE : Ra = 930 OHM ; AMPLIFICATION FACTOR u = 4,3 ; TRANSCONDUCTANCE s : 4,6mA/V ; LOAD IMPEDANCE Ra = 2500 – 5500 OHM ; GRID RESISTOR : 100 OHM FULLY TESTED WITH ROE TEST TUBE 1 = 107% TUBE 2 = 80% AVVT stand for Alesa Vaic Vacuum Tube these tubes AV5SL are designed for driving Power Tubes that need a high input voltage on the grid, such as the AV520B-SLX, VT-4C, UV845 and similar tubes. other applications are very Linear Output tube (pre-amplifier, Head-Phone Amplifier) . Also it can be used as an Output tube, producing Maximum 5 Watt Single Ended. It uses AVVTs unique Open filament structure, resulting in extreme linearity, also at high output voltage. Features: AVVT’s parallel ribbon filaments with 16 flat surfaces, for more linearity ; two large getters ; white Nickel plates ; c37 Shaped Glass ; Anti-microphonic Suspensions in tube top ; Hard Metal filaments which can never break ; Ceramic UX4 Socket with Gold Plated pins. Note: the “Open Filament Structure” means, the filament and the grid are longer than the anode, and stick out on both ends for about 5…8mm. The not fully warm ends of the filaments do not have a very good function, and cause distortion. This tube doesn’t use this part of the filaments. Emitted electrons from the cold ends, will bypass the anode, and land on the glass. At maximum Power this may cause fluorescent, blue glow on the tube glass inside. Note also “Hard-metal filaments” are operated at much higher temperature than normal tubes. This tube will glow bright orange, instead of the dark orange color of nickel filament tubes. Individual test data has been done with ROE computer tested all test results are printed and comes with tubes. ALL DOCUMENTS WILL BE SENT WITH TUBES PROFESSIONAL SAFE PACKAGE SHIPPING CODE TUBE 1 = 2031 S ( internal serial number on metal engraved tag ) see picture number 4 embedded in this listing CODE TUBE 2 = 2023 S ( internal serial number on metal engraved tag ) see picture number 4 embedded in this listing tube valve lampe röhre tsf 진공관 真空管 HAM RADIO audio hi-end hi-fi diy POWER AMPLIFIER Pre-Amplifier Preamp Pri VINTAGE stereo SE Single Ended PP Push-Pull VACUUM TUBES röhren