957

Sharp Cutoff Pentode — DHT — Acorn

Known Equivalents & Substitutes

CV2700VT237

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)135V

Typical Operating

Anode Voltage (typical)Anode Voltage135V

Grid 1 Bias VoltageGrid Voltage-5V

Anode CurrentAnode Current4mA

TransconductanceTransconductance1.6mA/V

Heater

Heater VoltageFilament Voltage1.25V

Heater CurrentFilament Current0.05A

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

References