QQZ0415

Quick-heating directly heated double tetrode designed for mobile RF equipment to approximately 186 MHz. Its paired sections and rapid warm-up suit mobile transmitter applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 680 mA

Description

The Mullard QQZ0415 is a quick-heating directly heated double tetrode for mobile RF equipment to 186 MHz.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 680 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.002 S
Max plate voltage: 400 V
Max screen voltage: 250 V
Max plate dissipation: 8 W
Max screen dissipation: 2 W
Max cathode current: 40 mA

Published ratings and characteristics promoted semantically from the approved source; repeated identical physical sections compressed where applicable.

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

1951 Mullard Valve and Service Manual

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Heating Time
2 s

Other

Operating Frequency Maximum
186 MHz
FullRatings
Power Output
5 W
PushPull,ClassC,Continuous
Power Output
6 W
PushPull,ClassC,Intermittent

Data set 02

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

Heater Voltage
6.3 V
Heater Current
680 mA
Filament Voltage
6.3 V
Filament Current
680 mA
Heating Time
2 s
Grid-Filament Capacitance
0.08 pF
EachSection
Plate-Filament Capacitance
3 pF
EachSection
Plate-Grid Capacitance
0.01 pF
EachSection
Push-Pull Input Capacitance
5.5 pF
TwoSections
Push-Pull Output Capacitance
2.9 pF
TwoSections
Transconductance
2000 uS
EachSection; Ia=20mA

Other

Maximum Plate Dissipation
8 W
EachSection
Maximum Operating Frequency
186 MHz
RF Output Power
19.5 W
ClassC; PushPull; Representative
RF Output Power
6 W
FrequencyTripler; Representative