TUBEOFILE
1LE3 — Small Signal Triode, Loctal | Tubeofile | Tubeofile
← Browse Medium quality — at least 60% of universal parameters and pins are present, but some key data is missing. Verify specific values against datasheets before critical use.
Known Equivalents & Substitutes
VT239
Electrical Specifications
Absolute Maximum
Anode Voltage (max) Maximum Plate Voltage 110V
Typical Operating
Anode Voltage (typical) Plate Voltage (typical) 90V
Grid 1 Bias Voltage Grid Voltage 0V
Anode Current Plate Current 4.5mA
Notes
RCA Tube Department data, October 15, 1947. Lock-in 8-pin base (Loctal), basing designation 4AA. Glass T-9 bulb. Directly-heated filament type. Filament voltage 1.4V DC, filament current 0.05A. Pin 5 is internal connection — do not use. Pin 3 and Pin 4 are no connection. Direct interelectrode capacitances (triode unit, with external shield connected to negative filament terminal): grid-to-plate 1.7 pF, grid-to-cathode 1.7 pF, plate-to-cathode 3.0 pF. Maximum plate voltage 110V. TDSL lists VT239 as close or identical substitute. Two operating conditions: (1) Va=90V, Vg=0V, mu=14.5, ra=11200 ohms, gm=1300 umhos, Ia=4.5 mA; (2) Va=90V, Vg=-3V, mu=14.5, ra=19000 ohms, gm=760 umhos, Ia=1.4 mA. NOTE: Despite user expectation of a damper/rectifier type, the RCA datasheet clearly identifies this as a MEDIUM-MU TRIODE for amplifier service. Pin Layout — Loctal
1 2 3 4 5 6 7 8
1 Filament (+)
2 Plate
3 No Connection
4
Socket-Compatible Tubes ⚠ Not electrically compatible
Anode Resistance Plate Resistance
11,200Ω
Transconductance Transconductance 1.3mA/V
Amplification Factor (μ) Amplification Factor 14.5—
Heater
Heater Voltage Filament Voltage 1.4V
Heater Current Filament Current 0.05A
No Connection
5 Internal Connection — Do Not Use