Power - Triode Single (under 10W) ·Triode
Early low-impedance triode usable as a small audio-output valve, initial low-frequency amplifier, or oscillator. Its moderate amplification and relatively low plate resistance provide useful stage gain and modest power without a pentode output device.
Low-impedance valve for use as a small output valve, initial low-frequency amplifier, or oscillator; intended to provide useful stage gain without a pentode.
European 4-pin 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
Published characteristics/ratings were promoted when unambiguous; remaining operating values are preserved in TUBE_SECTION_PARAMETER.
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.
Anode current
10.5 mA
Anode 100 V; grid bias -4 V
Anode current
18 mA
Anode 150 V; grid bias -6 V
Anode current
25 mA
Anode 200 V; grid bias -8 V
Data set 02
Published operating points and test conditions from this source.
Filament/heater voltage
16 V
Filament/heater current
250 mA
Maximum anode voltage
200 V
Maximum anode dissipation
5 W
Typical anode voltage
200 V
Typical anode current
25 mA
Amplification factor
12
Plate resistance
2660 ohm
Transconductance
4500 uS