Power - Triode ·Triode
Directly heated low-mu power triode designed for Class A audio-frequency output amplification. Manufacturer operating data emphasize low plate resistance, substantial current, and several watts of single-ended audio output rather than RF transmitting service.
Directly heated power output triode for audio-frequency 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.
1 physical section, each with unique specifications.
Section 1
Published Telefunken ratings and characteristics promoted from the supplied source.
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.
Plate voltage
250 V
ClassA
Plate current
60 mA
ClassA
Control-grid bias
-4 V
ClassA
Optimum load resistance
2300 ohm
ClassA
Power output
4.2 W
ClassA
Push-pull plate current
120 mA
PushPull
Push-pull load resistance
4000 ohm
PushPull
Push-pull power output
9.2 W
PushPull
Transconductance
4000 µS
ClassA
Plate resistance
670 ohm
ClassA
Data set 02
Published operating points and test conditions from this source.
HeaterOrFilamentVoltage
4 V
HeaterOrFilamentCurrent
950 mA
Maximum Plate Voltage
250 V
Maximum Plate Dissipation
15 W
Data set 03
Published operating points and test conditions from this source.
Grid-anode capacitance
23 pF
Plate current
60 mA
OneTube
Load resistance
2300 ohm
OneTube
Output power
4.2 W
OneTube
Output power
10 W
PushPull TwoTubes
Maximum cathode current
90 mA