Data: LowLow quality — significant gaps in core data (missing base, heater, universal parameters, or pins). Treat as a research stub; always cross-reference with datasheets.
Anode Voltage (typical)Plate Voltage (Class C)2,000V
Grid 1 Bias VoltageGrid Bias (Class C)-340V
Notes
The VT127A is the military designation for the Eimac 100TS (also designated 3-100D2). Used in WWII SCR-268 radar as a ring oscillator.
No standard socket base — connections are made via external rods protruding through the glass envelope: two top rods (plate, in parallel), two middle rods (grid, in parallel), two bottom rods (filament).
Class C operating data: Va=2000V, Ia=210mA, Vg=-340V, Pout≈300W. These are transmitter/RF amplifier conditions, not audio operating points.
Maximum plate dissipation is 100W continuous. For audio Class A use, plate voltage and current must be derated accordingly.
Transconductance (gm) and plate resistance (ra) not found in available sources; only mu=15.5 is confirmed. ra can be approximated as mu/gm when gm is measured at the operating point.
No standard catalog base — VT127A is an Eimac/Western Electric doorknob-style transmitting triode with 4 side rods (2 plate top, 2 grid middle, in parallel pairs) and 2 bottom filament rods. No conventional socket. Skipped by /roll scan.