Voltage - Dual Triode (similar) ·Triode-Triode
XCC189
Variable-transconductance twin triode designed for television channel-selector and cascode applications, providing controlled RF gain in television tuner front ends.
- Sections
- 2
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 4.5 V / 600 mA
Description
Variable-transconductance twin triode for television channel-selector and cascode applications.
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
- 4.5 V
- Nominal heater current
- 600 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
2 physical sections, each with unique specifications.
Section 1
Triode
- Plate resistance
- 2500 Ω
- Transconductance
- 0.0125 S
- Amplification factor
- 34
- Max plate voltage
- 130 V
- Max plate dissipation
- 1.8 W
- Max cathode current
- 22 mA
Miniwatt XCC189/4ES8 variable-transconductance twin triode for TV tuner/cascode service. First physical triode, intended grounded-cathode input stage. Typical characteristic point approximately Va 90 V, Ia 15–16 mA, gm 12.5 mA/V, amplification factor 34, plate resistance approximately 2.5 kΩ. Transconductance falls markedly as negative grid bias increases. Maximum operating plate 130 V, dissipation 1.8 W and cathode current 22 mA per section; 550 V is zero-current plate-supply limit, not working anode limit. Heater source discrepancy: Miniwatt 4.5 V 0.6 A; RCA 4ES8/XCC189 lists 4.0 V 0.6 A. Parent 4.5 V retained pending reconciliation.
Section 2
Triode
- Plate resistance
- 2500 Ω
- Transconductance
- 0.0125 S
- Amplification factor
- 34
- Max plate voltage
- 130 V
- Max plate dissipation
- 1.8 W
- Max cathode current
- 22 mA
Miniwatt XCC189/4ES8 variable-mu TV cascode dual triode, second physical section for grounded-grid stage. At typical Va 90 V and Ia roughly 15–16 mA, gm 12.5 mA/V, mu 34, plate resistance approximately 2.5 kΩ; the variable-gain characteristic changes with grid bias. Per-section maxima plate 130 V, dissipation 1.8 W and cathode current 22 mA. Heater source conflict: Miniwatt 4.5 V 0.6 A versus RCA 4.0 V 0.6 A; nominal parent heater retained at 4.5 V pending explicit resolution.
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.