Power - Triode ·Triode
Early Marconi directly heated low-mu audio power triode intended to provide loudspeaker output. Rated for about 13.5 W plate dissipation and 400 V, it represents an early high-current receiver output valve.
High-power output valve intended to provide sufficient output for loudspeaker operation at good volume.
European 5-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
Promoted values mapped from printed rating/approximate-data tables; additional operating points and capacitances retained as parameters.
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.
Published operating data
See source
Operating curves/table are present on the approved one-page source; values not promoted unless unambiguous in searchable text.
Data set 02
Published operating points and test conditions from this source.
Filament Voltage Minimum
4.25 V
Filament Voltage Maximum
5.25 V
Filament Current
800 mA
Anode Voltage Maximum
400 V
Anode Dissipation Maximum
13.5 W