QQE0420

Double tetrode designed for high-frequency amplifier and oscillator service. Its paired sections provide compact RF power generation and amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B7A
Base pins: -
Nominal heater: 6.3 V / 1.6 A

Description

Double tetrode for HF amplifier and oscillator service.

Socket description

Septar 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7A
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

2 physical sections, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.003 S
Amplification factor: 6.5
Max plate voltage: 670 V
Max screen voltage: 250 V
Max screen dissipation: 5 W

Identical repeated sections compressed to one row. Double tetrode for HF amplifier and oscillator service.

Section 2

Tetrode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this 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

1963 Philips Electron Tubes Handbook V4

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Cathode : oxyde
12.6 V
| Cathode : oxyde 6.3 12.6 V
Katode : Oxyd If
800 mA
| Katode : Oxyd If = 1.6 0.8 A

Capacitance

Capacitances per system Ca
3.8 pF
Capacitances | Capacitances per system Ca = 3.8 pF
Capacitds par systZme Cg
8 pF
Capacitances | Capacitds par systZme Cg1 = 8 pF
Cg
65 pF
Capacitances | Cg2k = 65 pF )

Other

Plate current
30 mA
Typical characteristics | Kenndaten S(Ia=30mA)2)= 3 mA/V
Plate current
3 mA/V
Typical characteristics | Kenndaten S(Ia=30mA)2)= 3 mA/V
Published electrical value
2 a
Class C telegraphy | 1)Including internal capacitor between grid No.2 and
Plate voltage
750 V
Maximum ratings | Va = max. 750 V Va = max. 670 V
Plate voltage
670 V
Maximum ratings | Va = max. 750 V Va = max. 670 V
Wia = max
18 W
Maximum ratings | Wia = max. 2x18 W Wia = max. 2x16 W
Wia = max
16 W
Maximum ratings | Wia = max. 2x18 W Wia = max. 2x16 W
Wa = max
7.5 W
Maximum ratings | Wa = max.2x7.5 W
Plate current
45 mA
Maximum ratings | Ia = max. 2x45 mA
Screen-grid voltage
250 V
Maximum ratings | Vg2 = max. 250 V
Wg
5 W
Maximum ratings | Wg2 = max. 5W
Control-grid voltage
175 V
Maximum ratings | -Vg1 = max. 175 V
Control-grid current
5 mA
Maximum ratings | Ig1 = max. 2x5 mA
Vkf = max
100 V
Maximum ratings | Vkf = max. 100 V
f
250 MHz
Maximum ratings | f = 200 200 200 250 250 Mc/s
Plate voltage
400 V
Maximum ratings | Va = 750 500 400 500 400 V
Screen-grid voltage
200 V
Maximum ratings | Vg2 = 200 200 200 200 200 V
Control-grid voltage
-65 V
Maximum ratings | Vg1 = -65 -65 -65 -65 -65 V
Plate current
40 mA
Maximum ratings | Ia = 2x24 2x36 2x45 2x32 2x40 mA
Screen-grid current
14 mA
Maximum ratings | Ig2 = 15 14 14 12 14 mA
Control-grid current
1 mA
Maximum ratings | Ig1 = 2x1.4 2x1.3 2x1.4 2x0.9 2x1.0 mA
Vgl g
140 V
Maximum ratings | Vgl g1' p = 150 150 150 140 140 V
Published electrical value
0.07 W
Maximum ratings | 8ig1 = 2x0.10 2x0.09 2x0.10 2x0.06 2x0.07 W
Wg
2.8 W
Maximum ratings | Wg2 3.0 2.8 2.8 2.4 2.8 W
via
16 W
Maximum ratings | via = 2x18 2x18 2x18 2x16 2x16 W
Na
7.5 W
Maximum ratings | Na = 2x5 2x5 2x5.25 2x7.0 2x7.5 W
WD
17 W
Maximum ratings | WD = 26 26 25.5 18 17 W
f = max
2 s
Maximum ratings | f = max. 200 Ms/s f = max. 2~O M2s
Vg = max
750 V
Maximum ratings | Vg = max. 750 V Va = max. 670 V
Vg = max
670 V
Maximum ratings | Vg = max. 750 V Va = max. 670 V
Wia = max
25 W
Maximum ratings | Wia = max. 2x25 W Wig = max.2x22 W
Wia = max
22 W
Maximum ratings | Wia = max. 2x25 W Wig = max.2x22 W
wg = max
10 W
Maximum ratings | wg = max. 2x10 W
Plate current
57.5 mA
Maximum ratings | Ia = max. 2x57.5 mA
Y
200 MHz
Maximum ratings | Y = 200 Mc/s
Plate voltage
750 V
Maximum ratings | Va = 750V
Vgp
200 V
Maximum ratings | Vgp = 200V
Control-grid voltage
50 V
Maximum ratings | Vg1 = ..50V
Plate current
32.5 mA
Maximum ratings | Ia = 2x32.5 mA
Screen-grid current
22 mA
Maximum ratings | Ig2 = 22 mA
Control-grid current
2 mA
Maximum ratings | Ig1 = 2x2.0 mA
Vglg
130 V
Maximum ratings | Vglg1'p = 130 V
Wig
0.12 W
Maximum ratings | Wig1 = 2x0.12 W
Wig
24.4 W
Maximum ratings | Wig = 2x24.4 W
Wa
6.9 W
Maximum ratings | Wa = 2x6.9 W

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Cathode : oxyde VE = 6,3
12.6 V
Katode : Oxyd I = 1,6
800 mA
Va = max, Vg =max.,
670 V
Wia = max, Wia = max, 2x1
6 W
' = 750 500 400 500
400 V
Va1 = -65 -65 -65 -65
~65 V
Ia = 2x24 2x36 2x45 2x32 2x4
0 mA
Ig2 15 14 14 12
14 mA
Ig1 = 2xt,4 2x%,3 2x1,4 2x0,9 2x1,
0 mA
Vg1g1'p = 150 150 150 140
140 V
Wig = 2x0,10 2x0,09 2x0,10 2x0,06 2x0,
7 W
Wgo = 3,0 2,8 2,8 2,4
2.8 W
Wia = 2x18 2x18 2x18 2x16 2x1
6 W
Wa = 2x5 2x5 2x5,25 2x7,0 2x7,
5 W
Wo = 26 26 25,5 18
17 W
f _ _=max, _ _
200 Mc/s
Va = max. 750 Vv Va max
670 v
Wia = max. 2x2 [1]
5 W
Wia = max. 2x2 [2]
2 W
Wa = max. 2x1
0 W
Ia = max. 2x5
7.5 mA
Woo max,
5 W
Vg2
200 v
Vg1
~-50 V
Ia = 2x3
2.5 mA
Ig2
22 mA
Igt = 2x2,
0 mA
Vgigi'p
130 V
Wig1 = 2x0,
12 W
Wg2
4.4 W
Wia = 2x2
4.4 W
Va = 2x6,
9 W
Wo
35 W
Wia = max. 2x1 [1]
1 W
Wia = max. 2x1 [2]
0 W
Is = max.2x3
7.5 mA
Vgp = max
250 V
g2 = max
3.4 W
Vg1 = max
175 v
Vif = max,
100 V
f = 200
200 Mc/s
Va = 600
425 V
Vgg = 200
200 V
Ia = 2x18 2%
26 mA

Capacitance

Capacitances per system Ca
3.8 pF
Capacités par systdme Cg1
8 pF
Cgdk
65 pF
Eenndaten $(Xa [1]
30 mA
Eenndaten $(Xa [2]
3 ma

Characteristic

et des broches max
180 °C