Power - Pentode (NOT beam) ·Pentode
Directly heated output pentode co-designated with 6A4 for conventional audio-frequency power amplification.
LA is explicitly printed with 6A4 as type 6A4/LA on the source sheet and represents the same directly heated output pentode.
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 maximum ratings and representative operating characteristics reviewed.
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 Resistance
60000 ohm
Transconductance
2500 µS
Amplification Factor
150
Maximum Plate Voltage
180 V
Maximum Screen Voltage
180 V
Power Output
1.5 W
Load Resistance
8000 ohm
Data set 02
Published operating points and test conditions from this source.
Plate voltage
180 V
ClassA
Screen-grid voltage
180 V
ClassA
Grid voltage
-12 V
ClassA
Plate current
22 mA
ClassA
Screen-grid current
3.9 mA
ClassA
Load resistance
8000 ohm
ClassA
Power output
1.4 W
ClassA
Plate resistance
45400 ohm
ClassA
Transconductance
2200 uS
ClassA