Power - Pentode (NOT beam) ·Pentode
Subminiature hearing-aid output pentode using a 1.25 V, 15 mA filament and direct-soldered wire leads. Designed for extremely compact, low-drain personal audio equipment.
Subminiature output pentode for hearing aids, using a 1.25 V, 15 mA filament and direct-soldered wire leads.
Subminiature all-glass 8-wire lead family
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
Subminiature output pentode for hearing aids.
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
22.5 V
ClassA
Screen Voltage
22.5 V
ClassA
Plate Current
0.3 mA
ClassA
Screen Current
0.075 mA
ClassA
Transconductance
350 µS
Plate Resistance
300000 ohm
Data set 02
Published operating points and test conditions from this source.
Application
Battery audio output
Intended equipment
Hearing aid
Data set 03
Published operating points and test conditions from this source.
Control-grid capacitance
2.5 pF
Plate capacitance
3.7 pF
Grid-to-plate capacitance
- to 0.2 pF
Plate voltage
22.5 V
ClassA HearingAid
Screen voltage
22.5 V
ClassA HearingAid
Plate current
300 uA
ClassA HearingAid
Screen current
75 uA
ClassA HearingAid
Grid voltage
-1.4 V
ClassA HearingAid
Power output
16.5 mW
ClassA 45V
Transconductance
350 uS
Data set 04
Published operating points and test conditions from this source.
Anode voltage
22.5 V
ClassA
Screen-grid voltage
22.5 V
ClassA
Anode current
300 uA
ClassA
Screen-grid current
75 uA
ClassA
Control-grid voltage
-1.4 V
ClassA
Input capacitance
2.5 pF
Output capacitance
3.7 pF
Anode-grid capacitance
<0.2 pF