9DZ8

Combination high-mu triode and power pentode designed as a two-stage audio-frequency amplifier operating from low plate-supply voltage, integrating voltage gain and output power.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: NOVAL
Socket code: B9A
Base pins: 9
Nominal heater: 9 V / 600 mA

Description

High-mu triode and power pentode designed as a two-stage audio-frequency amplifier from low plate-supply voltage. The supplied Tung-Sol datasheet was used for construction, heater, ratings, characteristics, and intended-service information.

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: NOVAL
Socket code: B9A
Base pins: 9
Nominal heater voltage: 9 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

NOVAL - 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

X-ray radiationInterelectrode capacitances

Transconductance: 0.0014 S
Amplification factor: 200
Max plate voltage: 150 V
Max plate dissipation: 0.75 W
Max cathode current: 5 mA

High-mu triode section.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.0075 S
Max plate voltage: 150 V
Max screen voltage: 135 V
Max plate dissipation: 6.5 W
Max screen dissipation: 1.5 W
Max cathode current: 60 mA

Power-pentode section.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
9 V
Heater current
600 mA
Plate voltage
120 V
TriodeSection

SECTION 2

Beam Power

Other

Plate voltage
145 V
PentodeSection

Data set 02

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate Voltage
120 V
Cathode Resistor
1500 ohm
Plate Current
0.8 mA

Characteristics

Grid Cutoff Voltage at 20 uA
-2.5 V

SECTION 2

Beam Power

Other

Plate Voltage
145 V
Screen Voltage
120 V
Cathode Resistor
180 ohm
Plate Current
45 mA
Screen Current
6 mA
Load Resistance
2500 ohm
Power Output
2 W