Voltage - Triode (single) ·Triode
High-efficiency general-purpose triode for detector or first low-frequency amplifier service, suitable for transformer or resistance coupling.
High-efficiency general-purpose valve for detector service or the first low-frequency amplifier, suitable for transformer or resistance coupling.
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
No fixed ratings are recorded for this section.
Published characteristics/ratings were promoted when unambiguous; remaining operating values are preserved in TUBE_SECTION_PARAMETER. Marconi DH high-efficiency receiving triode for grid-leak or anode-bend detection and first low-frequency amplification in DC mains sets. Approximate operating plate voltage: grid-leak/power-grid detector 50–150 V; anode-bend detector 100–200 V with grid bias -2 to -6 V; amplifier 100–200 V with appropriate negative bias. These are operating ranges, not explicit absolute limits.
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
Leaky-grid or power-grid detector
Anode voltage
100 to 200 V
Anode-bend detector; grid bias -2 to -6 V
Anode voltage
100 to 200 V
Amplifier; grid bias -1.5 to -3 V