Power - Triode ·Triode
Higher-power directly heated development of the 300B family for demanding Class A audio output stages. Increased plate-voltage, current, and approximately 60 W dissipation capability extend operation substantially beyond conventional 300B limits.
300B-XLM high-power directly heated 300B-family audio triode. The supplied Emission Labs sheet was read for filament data, maximum ratings, representative operating points, gm/rp/mu, output conditions, capacitances, and rectifier filter conditions as applicable.
Medium-shell UX 4-contact
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
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.
Filament voltage
5 V
Filament current
1.5 A
Plate resistance
720 ohm
ClassA
Amplification factor
4.5
ClassA
Transconductance
6200 uS
ClassA
Plate voltage
400 V
ClassA
Plate current
75 mA
ClassA
Grid voltage
-88 V
ClassA
Peak plate dissipation
60 W