Voltage - Triode (single) ·Triode
Compact directly heated general-purpose triode for portable battery receivers where low filament consumption and small size are important.
General-purpose valve of similar characteristics to ML.2 but with lower mutual conductance; recommended for portable receivers where space is limited.
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 voltage
50 to 150 V
Grid-leak detector
Anode voltage
100 to 150 V
Anode-bend detector
Anode voltage
75 to 150 V
Low-frequency amplifier
Data set 02
Published operating points and test conditions from this source.
Filament Voltage
2 V
Filament Current
100 mA
Transconductance
670 uS
Maximum/Published Anode Voltage
150 V
Typical Detector Anode Voltage
50-150 V
Typical LF Amplifier Anode Voltage
75-150 V