QQV0415

VHF power double tetrode designed for RF amplifier and oscillator service to approximately 250 MHz. Its paired sections support compact transmitter output circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 1.6 A

Description

VHF power double tetrode for RF amplifier and oscillator service to 250 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: 1.6 A
Parallel heater voltage: 6.3 V
Parallel heater current: 1.6 A
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

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.003 S
Max plate voltage: 750 V
Max screen voltage: 250 V
Max plate dissipation: 7.5 W
Max cathode current: 55 mA

Two electrically similar RF tetrode sections; represented once under identical-section compression.

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

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Maximum operating frequency
250 MHz
RF operating frequency
200 MHz
ClassC
RF plate voltage
500 V
ClassC
RF screen voltage
200 V
ClassC
RF control-grid voltage
-65 V
ClassC
RF plate current per section
36 mA
ClassC
RF output power
26 W
ClassC
RF operating frequency
250 MHz
ClassC
RF plate voltage
500 V
ClassC
RF screen voltage
200 V
ClassC
RF control-grid voltage
-65 V
ClassC
RF plate current per section
32 mA
ClassC
RF output power
18 W
ClassC
RF operating frequency
200 MHz
ClassC,Modulated
RF plate voltage
600 V
ClassC,Modulated
RF screen voltage
200 V
ClassC,Modulated
RF control-grid voltage
-65 V
ClassC,Modulated
RF plate current per section
18 mA
ClassC,Modulated
RF output power
17 W
ClassC,Modulated
Maximum anode dissipation per section
7.5 W
Heater-cathode voltage maximum
100 V

Capacitance

Plate-grid capacitance per section
0.07 pF
Push-pull input capacitance
8 pF
PushPull
Push-pull output capacitance
3.8 pF
PushPull

Characteristics

Transconductance
3 mA/V
Grid1-to-grid2 amplification factor
6.5

Application

Application
RF power amplifier / oscillator / frequency multiplier