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957 — Sharp Cutoff Pentode, Acorn | Tubeofile
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957
Sharp Cutoff Pentode — DHT — Acorn
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↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
CV2700
VT237
Similar Tubes (Not Drop-In Compatible)
954
Acorn pentode (remote-cutoff) with 6.3V heater — different heater voltage and cutoff characteristic, not interchangeable
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
135
V
Typical Operating
Anode Voltage (typical)
Anode Voltage
135
V
Grid 1 Bias Voltage
Grid Voltage
-5
V
Anode Current
Anode Current
4
mA
Transconductance
Transconductance
1.6
mA/V
Heater
Heater Voltage
Filament Voltage
1.25
V
Heater Current
Filament Current
0.05
A
Notes
Acorn-type envelope with radial wire leads — uses special acorn socket (5-pin, JEDEC base 5BD).
Battery-type filament: 1.25V at 0.05A — designed for portable/field equipment.
GE Essential Characteristics classifies this as 'Medium-Mu Triode (Acorn)' but it is in fact a sharp-cutoff pentode.
Sams Substitution Handbook cross-references 01C (and reverse: D1C substitutes 957).
TDSL lists CV2700 and VT237 as close or identical substitutes.
GE lists typical operating conditions at Va=135V, Vg=-5V, Ia=4.0mA, gm=1600 umhos.
Socket-Compatible Tubes
⚠ Not electrically compatible
955
958A
References
https://frank.pocnet.net/sheets/049/9/957.pdf