Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode
Double-diode high-mu triode combining receiver detection with low-frequency voltage amplification. Two separate diode elements accommodate detection and control-signal duties while the triode provides useful gain for the recovered audio signal.
The Marconi DH77 is a miniature indirectly heated double-diode-triode for detector and low-frequency amplifier service.
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.
3 physical sections, each with unique specifications.
Section 1
Triode section. Diode ratings and capacitances are retained in parameters because only one representative technical section row is emitted in this compact extraction.
Section 2
No fixed ratings are recorded for this section.
Physical diode section added during approved section-structure reconciliation.
Section 3
No fixed ratings are recorded for this section.
Physical diode section added during approved section-structure reconciliation.
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.
Heater voltage
6.3 V
Heater current
300 mA
Triode maximum plate voltage
250 V
TriodeSection
Triode amplification factor
70
TriodeSection
Triode transconductance
1200 uS
TriodeSection
Triode plate resistance
58000 ohm
TriodeSection
Physical diode count
2
Physical triode count
1