Voltage Pentode ·Pentode
High-transconductance broadband power pentode designed for low-distortion output stages in video and oscilloscope amplifiers. It combines substantial load-driving capability with wide frequency response.
High-transconductance broadband power pentode for low-distortion output stages in video and oscilloscope amplifiers.
Small-button Noval 9-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
Published section data promoted where applicable.
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.
Typical Plate Voltage
125 V
PentodeConnection
Typical Screen Voltage
125 V
PentodeConnection
Typical Plate Current
35 mA
PentodeConnection
Data set 02
Published operating points and test conditions from this source.
Heater voltage Vg
6.3 V
Heating
Heater current If
350 mA
Heating
Anode current Iy
35 mA
Heating
Mutual conductance S
26 mA
Heating
Noise factor at
100 MHz
Heating
Heater voltage Vs
6.3 v
Characteristics
Heater current I
350 mA
Characteristics
and heater It max
5 uA
Characteristics
Anode voltage Vag, max
400 V
Limiting Values
Anode dissipation W, max
4.2 W
Limiting Values
Grid No.2 voltage Vg20 max
2 V
Limiting Values
Grid No.2 dissipation l) Wg2 max
2 W
Limiting Values
Cathode current Ik max
50 mA
Limiting Values
Voltage between cathode and heater Vit max
100 V
Limiting Values
Heater voltage: The average heater voltage should be
6.3 V
Limiting Values
by more than
10 a
Limiting Values
Maximum plate voltage
400 V
Promoted published datasheet value
Maximum screen voltage
400 V
Promoted published datasheet value
Maximum plate dissipation
4.2 W
Promoted published datasheet value
Maximum screen dissipation
1.4 W
Promoted published datasheet value
Anode supply voltage Vba
125 v
Characteristics
Grid No
2 v
Characteristics
Grid No.3 voltage Vg3
3 mA
Characteristics
Grid No.1 supply voltage +Vbg
1 v
Characteristics
Cathode resistor Ry
300 Ω
Characteristics
Anode current Iy
33 to 37 mA
Characteristics
Grid No.2 current Ig2
1119.9 to 12.1 mA
Characteristics
Mutual conductance S
22 to 30 mA
Characteristics
Equivalent noise resistance Req
200 Ω
Characteristics
Noise factor at
100 MHz
Characteristics
Negative grid current —Igl max
0.3 uA
Characteristics
Anode supply voltage Vba
135 v
Characteristics
Grid No.2 supply voltage Vbg2
2 v
Characteristics
Grid No.3 voltage Vg3
3 v
Characteristics
Grid No.1 supply voltage +Vbgl
1 v
Characteristics
Cathode resistor Rg
360 Ω
Characteristics
Anode current Iy
30 mA
Characteristics
Grid No.2 current Igz
2 mA
Characteristics
Mutual conductance S
25 mA
Characteristics
Grid No.3 supply voltage Vbg3
3 v
Characteristics
Cathode resistor Rk
350 Ω
Characteristics
Anode current Iy
40 mA
Characteristics
Mutual conductance S
32 mA
Characteristics
Equivalent noise resistance Req
100 Ω
Characteristics
Anode to other electrodes (V =
300 V
Characteristics
Grid No.1 to other electrodes (V =
1 V
Characteristics
Plate resistance
800 Ω
Promoted published datasheet value
Transconductance
26000 µS
Promoted published datasheet value
Amplification factor
27
Promoted published datasheet value
cathode, heater and screen Cgl/gzgslds
10 pF
Capacitances
cathode, heater and screen Cgl /828
828 pF
Capacitances
Cathode current Iy =
46 mA
Capacitances
cathode, heater and screen Ca/g2g3kfs
2 pF
Capacitances
Anode to grid No.1 Cag
1 mpF
Capacitances
Anode to cathode Cak max
50 mpF
Capacitances
Cathode to heater Cke
4.7 pF
Capacitances
Grid No.1 to heater Cg if max
1 mpF
Capacitances