Voltage Pentode or Tetrode (with diode) ·Diode-Diode-Pentode
10KU8
Frame-grid sharp-cutoff pentode combined with two diode sections for television video amplification and horizontal phase-detector service.
- Sections
- 3
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 10.2 V / 450 mA
Description
Frame-grid sharp-cutoff pentode combined with two diode sections for video and horizontal phase-detector service.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 10.2 V
- Nominal heater current
- 450 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- Yes
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
3 physical sections, each with unique specifications.
Section 1
Diode
No fixed ratings are recorded for this section.
RCA/Sylvania first physical diode for TV horizontal phase detector. Diode capacitances published. Typical diode current about 2 mA at 10 V applied is not a maximum current rating. Shared 10.2 V, 0.45 A series heater.
Section 2
Diode
No fixed ratings are recorded for this section.
Second separate diode for horizontal phase detection. Datasheet publishes capacitance and about 2 mA typical current at 10 V applied; this is not a maximum rating. Heater 10.2 V, 0.45 A.
Section 3
Pentode
- Plate resistance
- 50000 Ω
- Transconductance
- 0.02 S
- Max plate voltage
- 330 V
- Max plate dissipation
- 4 W
- Max screen dissipation
- 1.1 W
RCA/Sylvania frame-grid sharp-cutoff TV video-amplifier pentode. Maximum plate 330 V, plate dissipation 4 W, screen dissipation 1.1 W for screen voltages up to 165 V; higher conditions use rating chart. Typical operating plate 200 V, screen 100 V, cathode resistor 82 ohms: gm 20 mA/V, plate resistance ~50 kΩ. Interelectrode capacitances published; two separate horizontal phase-detector diodes are also present.
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.