958A — Small Signal Triode, Acorn | Tubeofile | Tubeofile
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← Browse Low quality — significant gaps in core data (missing base, heater, universal parameters, or pins). Treat as a research stub; always cross-reference with datasheets.
Known Equivalents & Substitutes
CV2701
Similar Tubes (Not Drop-In Compatible)
Acorn triode with 6.3V heater — same structure (triode) but different heater voltage, not interchangeable 958
Original version with slightly different ratings — TDSL lists as 'different rating or performance' Electrical Specifications
Absolute Maximum
Anode Voltage (max) Anode Voltage (max) 135V
Anode Dissipation (max) Anode Dissipation (max) 0.6W
Typical Operating
Anode Voltage (typical) Anode Voltage 135V
Grid 1 Bias Voltage Grid Voltage -6V
Notes
Acorn-type envelope with radial wire leads — uses special acorn socket (5-pin, JEDEC base 5BD). Battery-type filament: 1.25V at 0.1A — designed for portable/field transmitter equipment. The 958A is an improved version of the 958 with tighter specifications. TDSL lists CV2701 as close or identical; 958, CV650, VT212 as different rating/performance. Sams Substitution Handbook cross-references 02C (and reverse: D2C substitutes 958A). GE Essential Characteristics lists typical operation at Va=135V, Vg=-6V, Ia=1.9mA, gm=650 umhos, Pa_max=0.6W. Socket-Compatible Tubes ⚠ Not electrically compatible
Anode Current Anode Current
1.9mA
Transconductance Transconductance 0.65mA/V
Heater
Heater Voltage Filament Voltage 1.25V
Heater Current Filament Current 0.1A