EH2

Variable-mu heptode documented in the source table; despite its current hexode section assignment, available application detail is insufficient for a narrower functional classification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 200 mA

Description

EH2 is listed in the supplied valve table as a variable-mu heptode. Published operating and characteristic values were transcribed from its target row.

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: 200 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

Hexode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.0014 S
Max plate voltage: 550 V
Max plate dissipation: 1.56 W

Published target-row operating and characteristic values reviewed.

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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Hexode

Other

Plate voltage
250 V
Published European table row
Screen voltage
100 V
Published European table row
Plate current
4.2 mA
Published European table row
Control-grid bias
3 V
Published European table row

Characteristic

Plate resistance
1000000 ohm
Published European table row
Transconductance
1400 µS
Published European table row
Heater/filament voltage
6.3 V
Published European table row
Heater/filament current
200 mA
Published European table row

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Hexode

Characteristic

bei
100 V
Ve =0, S
3 mA/V
W4
100 V
1250 Vaa250V 5
-3 V
spannung von
250 V
einer negativen Vorspannung des Gitters 1 von —
3 V
125041 heit betrigt etwa
1.8 mA/V
tigte Oszillatorspannung etwa
14 V
von [1]
250 V
von [2]
80 V
von —
2 V
Al v 250
250 V
_Vgaagu [1]
80 V
_Vgaagu [2]
100 V
%"20 =TS N Vo= tps [1]
0 V
%"20 =TS N Vo= tps [2]
80 V
Heizspannung
6.3 V
V()sl
14 V
I, [1]
1.85 mA
I, [2]
1.8 mA
Schirmgitterstrom [1]
3.8 mA
Schirmgitterstrom [2]
3.5 mA
Mischsteilheit [1]
400 pA/V
Mischsteilheit [2]
<10 pA/V
Mischsteilheit [3]
400 pA/V
Vo = Vi [1]
-3 V
Vo = Vi [2]
25 V
Vo = Vi [3]
2 V
Vo = Vi [4]
20 V
I, [1]
4.2 mA
I, [2]
4 mA
Igo + Iy [1]
2.8 mA
Igo + Iy [2]
2.5 mA
Steilheit [1]
1400 pA/V
Steilheit [2]
1400 pA/V
wendet werden. Die Regelung der
42 mA
es, bis zu sehr kurzen Wellen
0.5 uF
M UN—> Ave +
250 V

Other

Anodenspannung [1]
250 V
Anodenspannung [2]
250 V
Vg2, [1]
100 V
Vg2, [2]
80 V
Va [1]
250 V
Va [2]
250 V
"n = Vg [1]
100 V
"n = Vg [2]
80 V
Vao = max [1]
550 V
Vao = max [2]
0.3 pA
Vao = max [3]
1.3 V
Va = max [1]
300 V
Va = max [2]
1.3 V
Wa = max
1.56 W
Ve2o=Vgto = max [1]
400 V
Ve2o=Vgto = max [2]
10 mA
Vi2 = Vgg = max
125 V
Wye = Wyqy= max
0.5 W

Capacitance

eine negative Gittervorspannung von —2 Volt bei einer Spannung von
80 V