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958A — Small Signal Triode, Acorn | Tubeofile
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958A
Small Signal Triode — DHT — Acorn
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↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
CV2701
Similar Tubes (Not Drop-In Compatible)
955
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)
135
V
Anode Dissipation (max)
Anode Dissipation (max)
0.6
W
Typical Operating
Anode Voltage (typical)
Anode Voltage
135
V
Grid 1 Bias Voltage
Grid Voltage
-6
V
Anode Current
Anode Current
1.9
mA
Transconductance
Transconductance
0.65
mA/V
Heater
Heater Voltage
Filament Voltage
1.25
V
Heater Current
Filament Current
0.1
A
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
955
957
References
https://frank.pocnet.net/sheets/049/9/958A.pdf