958A

Small Signal Triode — DHT — Acorn

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 Voltage135V

Grid 1 Bias VoltageGrid Voltage-6V

Anode CurrentAnode Current1.9mA

TransconductanceTransconductance0.65mA/V

Heater

Heater VoltageFilament Voltage1.25V

Heater CurrentFilament Current0.1A

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

References