11LT8

Twin discriminator diodes and sharp-cutoff pentode designed for television horizontal AFC discrimination and low-frequency horizontal-oscillator service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: 9RL
Socket code: B9A
Base pins: 9
Nominal heater: 11.4 V / 315 mA

Description

Miniature combination tube with two discriminator diodes and a sharp-cutoff pentode used in low-frequency horizontal-oscillator 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: 9RL
Socket code: B9A
Base pins: 9
Nominal heater voltage: 11.4 V
Nominal heater current: 315 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9RL - 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 200000 Ω
Transconductance: 0.013 S
Max plate voltage: 330 V
Max screen voltage: 330 V
Max plate dissipation: 3.1 W
Max screen dissipation: 0.65 W

Published ratings and characteristics extracted from the approved RCA source. Pulse-only ratings remain parameter rows unless explicitly continuous.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published ratings and characteristics extracted from the approved RCA source. Pulse-only ratings remain parameter rows unless explicitly continuous.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Second discriminator diode section added from approved reconciliation; no unsupported electrical values promoted.

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.

Data set 01

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater Warm-up Time (Average)
11 s
Other;PublishedValue1
Heater Warm-up Time (Average)
11 s
Other;PublishedValue2
Heater Warm-up Time (Average)
11 s
Other;PublishedValue3
Peak value
200 V
Other;PublishedValue1
Peak value
200 V
Other;PublishedValue2
Peak value
200 V
Other;PublishedValue3
Average value
100 V
Other;PublishedValue1
Average value
100 V
Other;PublishedValue2
Average value
100 V
Other;PublishedValue3
Plate Voltage
330 V
MaximumRating
Grid-No
2 V
MaximumRating;PublishedValue1
Grid-No
330 V
MaximumRating;PublishedValue2
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
MaximumRating
Plate Dissipation
3.1 W
MaximumRating
For grid-No
2 V
MaximumRating;PublishedValue1
For grid-No
165 V
MaximumRating;PublishedValue2
For grid-No
0.65 V
MaximumRating;PublishedValue3
For grid-No
2 V
MaximumRating;PublishedValue1
For grid-No
165 V
MaximumRating;PublishedValue2
For grid-No
33 V
MaximumRating;PublishedValue3
For grid-No
300 V
MaximumRating;PublishedValue4
Maximum Plate Voltage
330 V
Section1
Maximum Screen Voltage
330 V
Section1
Maximum Plate Dissipation
3.1 W
Section1
Maximum Screen Dissipation
0.65 W
Section1

Characteristic

Plate Voltage
125 V
Characteristic
Grid-No
2 V
Characteristic;PublishedValue1
Grid-No
125 V
Characteristic;PublishedValue2
Cathode-Bias Resistor
56 ohm
Characteristic
Plate Resistance (Approx.)
200000 ohm
Characteristic
Plate Current
10 mA
Characteristic
Grid-No
2 mA
Characteristic;PublishedValue1
Grid-No
3.4 mA
Characteristic;PublishedValue2
Grid-No.l Voltage (Approx.) for plate current of
20 V
Characteristic;PublishedValue1
Grid-No.l Voltage (Approx.) for plate current of
-3.5 V
Characteristic;PublishedValue2
Tube Voltage Drop for plate current of
20 mA
Characteristic
Plate Resistance
200000 ohm
Section1
Transconductance
13000 uS
Section1