Power - Triode ·Triode
Higher-current 300B-XLS-family directly heated audio power triode, also specified as a replacement for type 842. Roughly 55 W continuous plate dissipation and high-current Class A operation permit substantially greater single-tube output than a conventional 300B.
Higher-current 300B-XLS-family audio power triode; also specified as a replacement for type 842. 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
1.7 A
Plate resistance
630 ohm
ClassA
Amplification factor
4.2
ClassA
Transconductance
6700 uS
ClassA
Plate voltage
495 V
ClassA
Plate current
110 mA
ClassA
Grid voltage
-104 V
ClassA
Maximum Class A output power
22 W
Peak plate dissipation
65 W
OneMinute