Voltage - Triode (with diode, heptode or hexode) ·Diode-Triode
OSRAM 30-watt power triode designed for push-pull Class-A and Class-AB audio amplification, with pairs capable of substantial audio-frequency output.
DA30: OSRAM combined diode-triode valve. The complete approved OSRAM sheet was read for construction, characteristics, operating data, and application guidance.
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.
2 physical sections, each with unique specifications.
Section 1
Applicable promoted ratings mapped semantically from the printed approximate-data/ratings tables; useful non-promoted operating, capacitance and service data retained in TUBE_SECTION_PARAMETER.
Section 2
No fixed ratings are recorded for this section.
Missing physical diode section added during approved diode-triode 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/filament voltage
4 V
Heater/filament current
2 A
Plate impedance
910 ohm
Mutual conductance
3850 uS
Maximum anode voltage
500 V
Data set 02
Published operating points and test conditions from this source.
Filament/heater voltage
4 V
Filament/heater current
2 A
Plate impedance
910 ohm
Mutual conductance
3850 uS
Data set 03
Published operating points and test conditions from this source.
Class-A Output per Pair
20 W
ClassA;PushPull
Class-AB Output per Pair Minimum
44 W
ClassAB;PushPull
Class-AB Output per Pair Maximum
60 W
ClassAB;PushPull