Power - Pentode Single (NOT beam) (under 10W) ·Pentode
Four-volt directly heated power pentode with manufacturer-published output operating characteristics. Its filamentary cathode and power ratings suit low-frequency receiver output service.
4 V directly heated power pentode. Electrical ratings and operating characteristics were extracted from the supplied 4-volt valve data table, including the published heater data and available section-level values.
European 8-pin side-contact base
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Audio output pentode; maximum ratings and a representative published operating point are promoted.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Plate voltage
250 V
Plate current
36 mA
Screen voltage
250 V
Screen current
6.8 mA
Optimum load resistance
7000 ohm
Power output
3.1 W
Grid AC input voltage
9.7 V RMS
Maximum anode dissipation
9 W
Transconductance
2800 µS
Plate resistance
43000 ohm
Data set 02
Published operating points and test conditions from this source.
Typical plate voltage
250 V
Typical screen voltage
250 V
Typical plate current
36 mA
Typical control-grid voltage
-15 V
Output power
3.1 W
Single-ended published operating point
Load resistance
7000 Ohm
Single-ended published operating point
Data set 03
Published operating points and test conditions from this source.
Heater voltage
4 V
Heater current
1.1 A
Transconductance
2800 uS
Plate resistance
43000 ohm
Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Grid voltage
-15 V
ClassA
Plate current
36 mA
ClassA
Screen current
6.8 mA
ClassA