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Power - Pentode Single (NOT beam) (under 10W) ·Pentode

CL4

High-sensitivity output pentode for transformerless AC/DC radio equipment, delivering approximately 4 W.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: P8A
Base pins: 8
Nominal heater: 28 V / 200 mA

Description

Power output pentode with 200 V typical operating conditions, 8 mA/V transconductance, 4 W output and ratings for AC/DC receiver service.

Socket description

European 8-pin side-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: P8A
Base pins: 8
Nominal heater voltage: 28 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 25000 Ω
Transconductance: 0.008 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 9 W
Max screen dissipation: 1.5 W
Max cathode current: 70 mA

Published ratings and characteristics promoted from the approved source.

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

Pentode

Other

Plate voltage
200 V
ClassA
Plate current
45 mA
ClassA
Screen voltage
200 V
ClassA
Screen current
6 mA
ClassA
Grid bias
-8.5 V
ClassA
Optimum load resistance
4500 ohm
ClassA
Power output
4 W
ClassA
Distortion
5 %
AtRatedOutput
Grid AC voltage
9 V RMS
AtRatedOutput

Characteristic

Transconductance
8 mA/V
ClassA
Internal resistance
35000 ohm
ClassA

Data set 02

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Anode voltage
200 V
Screen-grid voltage
200 V
Cathode resistance
170 Ω
Anode current
45 mA
Screen-grid current
6 mA
Load resistance
4.5 kΩ
Audio output power
4 W
Distortion at rated output
10 %
Cold anode voltage maximum
400 V
Cold screen-grid voltage maximum
400 V

Data set 03

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Anode voltage
200 V
Screen voltage
200 V
Control-grid voltage
-8.5 V
Anode current
45 mA
Screen current
6 mA
Load resistance
4500 ohm
Output power
4 W
Total distortion
10 %
Cathode resistor
167 ohm
Anode supply voltage maximum
400 V
Plate voltage maximum
250 V
Plate dissipation maximum
9 W
Cathode current maximum
70 mA
Screen supply voltage maximum
400 V
Screen voltage maximum
250 V
Screen dissipation maximum
2 W
Heater-cathode voltage maximum
175 V

Characteristic

Transconductance
8000 uS
Plate resistance
35000 ohm

Data set 04

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

a Die Rohre CL
9
Published datasheet specification
K Heizleistung erforderlich. Bei
0 mA
Published datasheet specification
betrigt die Heizspannung deswegen
3 V
Published datasheet specification
; bei
5
Published datasheet specification
Gitterwechselspannungsbedarf pro Gitter ist
2.5 V
Published datasheet specification
Heizspannung . e Vi
33 V
Published datasheet specification
Heizstrom. I —
200 A
Published datasheet specification
Anodenspannung . . Va
200 V
Published datasheet specification
Schirmgitterspannung . V2
200 V
Published datasheet specification
Kathodenwiderstand . Ry,
170
Published datasheet specification
Neg. Gittervorspannung. . . Ve
8.5 V
Published datasheet specification
Anodenstrom . . . . . . . .. ... I
45 mA
Published datasheet specification
Schlrmgltt(‘rctrom N
6 mA
Published datasheet specification
Steilheit im Arbeltspunkt e .S
8 mA
Published datasheet specification
Innerer Widerstand im Arbeltspunkt R;
35000
Published datasheet specification
Giinstigster Anpassungswiderstand. R,
4500
Published datasheet specification
Ausgangsleistung bet 10 %/, Verzerrung . W,
4 W
Published datasheet specification
Gitterwechselspannung bei 4 W . Vi
5 V
Published datasheet specification
Empfindlichkeit e Viisomw)
0.5 V
Published datasheet specification
Schirmgitterspannung . e
200 V
Published datasheet specification
Kathodenwiderstand . . . . . . . . . Rji
135
Published datasheet specification
Anodenruhestrom . . . . . . . . Tao
2
Published datasheet specification
Anodenstrom bei voller Au@steuerung Ta max
2
Published datasheet specification
Schirmgitterruhestrom . . . . . glomax
2
Published datasheet specification
Schlrmﬂltterstrom bei voller Auscteuerung
2 ma
Published datasheet specification
Vao
350 V
Published datasheet specification
Ve2o
550 V
Published datasheet specification
Vez
250 V
Published datasheet specification
Wea
2 W
Published datasheet specification
Vgt (Igt
0.3
Published datasheet specification
g1k
1
Published datasheet specification
negativen Gitterspannunyg bei Va
200 V
Published datasheet specification
Tone ist aber ein kleiner Elektrolytkondensator von
5
Published datasheet specification
l Vgr
0 V
Published datasheet specification
Anodenstrom als Funktion der ¢ f +
4 V
Published datasheet specification
Anodenspannung bei Vg,
207 V
Published datasheet specification
Published specification
1
Published datasheet specification
f | 5 Ll Llao
2
Published datasheet specification
64 g] [ Hm
135
Published datasheet specification
+ j‘ Rl 11T Re
45000 S
Published datasheet specification