Voltage Drop (typical)Average Tube Voltage Drop (at 350 mA)25V
DC Output Current (max)DC Output Current (max)175mA
Peak Anode Current (surge)Steady-State Peak Plate Current1,050mA
Heater
Heater VoltageHeater Voltage18.9V
Heater CurrentHeater Current0.6A
Notes
Tung-Sol tentative data, December 1, 1956, Plate #4843. Short intermediate-shell 5 or 6 pin Octal, glass T-9 bulb, basing 4CG.
Coated unipotential cathode. Any mounting position.
Socket terminals #1, #2, #4 and #6 should not be used as tie points. Pin #1 omitted on 5-pin base.
Interelectrode capacitances (without external shield): heater-to-cathode (H to K) 4.0 pF, plate-to-cathode-and-heater (P to H+K) 8.5 pF, cathode-to-plate-and-heater (K to P+H) 11.5 pF.
Peak heater-cathode voltage: heater positive — 100V DC, 300V total DC and peak; heater negative — 900V DC, 4500V total DC and peak (absolute maximum).
Heater warm-up time approximately 11.0 seconds.
Average tube voltage drop at 350 mA (with tube conducting 350 mA): 25V.
Values for 19AU4GTA: DC output current max 190 mA, steady-state peak plate current 1150 mA. Values for 19AU4: DC output current max 175 mA, steady-state peak plate current 1050 mA.
Pin Layout — Octal
2Internal Connection — Do Not Use
3Cathode
5Plate (Anode)
7Heater
8
Socket-Compatible Tubes ⚠ Not electrically compatible