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Power - Pentode (NOT beam) ·Pentode

4699

High-transconductance audio power pentode providing roughly 8 W single-ended or 29 W push-pull output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: P8A
Base pins: 8
Nominal heater: 6.3 V / 1.5 A

Description

The Philips 4699 is a high-slope output pentode with about 14.5 mA/V transconductance and 6 W Class A output.

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: 6.3 V
Nominal heater current: 1.5 A
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

Transconductance: 0.0145 S
Amplification factor: 20
Max plate voltage: 425 V
Max screen voltage: 425 V
Max plate dissipation: 18 W
Max screen dissipation: 5 W
Max cathode current: 90 mA

Philips high-transconductance output pentode with published Class-A, Class-AB, and triode-connected Class-AB operating data.

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

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Plate Voltage
250 V
Screen Voltage
250 V
Anode Current
72 mA
Screen Current
8 mA

Other

Power Output
6 W
ClassA

Data set 02

1963 Philips Electron Tubes Handbook V1

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Cathode resistor
90 ohm
ClassA
Plate current
72 mA
ClassA
Screen current
8 mA
ClassA
Load resistance
3.5 kOhm
ClassA
Power output
8 W
ClassA
Plate supply voltage
425 V
ClassAB; PushPull
Load resistance plate-to-plate
8 kOhm
ClassAB; PushPull
Power output
29 W
ClassAB; PushPull
Plate supply voltage
400 V
ClassAB; PushPull; TriodeConnection
Cathode resistor
175 ohm
ClassAB; PushPull; TriodeConnection
Load resistance plate-to-plate
5.5 kOhm
ClassAB; PushPull; TriodeConnection
Power output
13 W
ClassAB; PushPull; TriodeConnection

Characteristic

Transconductance
14500 uS
ClassA
Plate resistance
20 kOhm
ClassA