4682

Philips audio power pentode for push-pull Class AB service, with a pair delivering approximately 19 W.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: P35-32
Socket code: P8A
Base pins: 8
Nominal heater: 4 V / 1 A

Description

Indirectly heated output pentode for Class-B and AB 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: P35-32
Socket code: P8A
Base pins: 8
Nominal heater voltage: 4 V
Nominal heater current: 1 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

P35-32 - 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

Max plate voltage: 375 V
Max screen voltage: 250 V
Max plate dissipation: 9 W
Max screen dissipation: 1.5 W
Max cathode current: 50 mA

Promoted only from clearly identified published characteristics/limits; additional operating, capacitance, regulator, gas-tube, and push-pull data retained as section parameters.

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
375 V
ClassAB;PushPull;TwoTubes;FixedBias
Screen voltage
250 V
ClassAB;PushPull;TwoTubes;FixedBias
Quiescent plate current per tube
20 mA
ClassAB;PushPull;TwoTubes;FixedBias
Full-modulation plate current per tube
45 mA
ClassAB;PushPull;TwoTubes;FixedBias
Quiescent screen current per tube
3 mA
ClassAB;PushPull;TwoTubes;FixedBias
Full-modulation screen current per tube
5.5 mA
ClassAB;PushPull;TwoTubes;FixedBias
Control-grid bias
-32 V
ClassAB;PushPull;TwoTubes;FixedBias
Optimum plate-to-plate load
9000 Ω
ClassAB;PushPull;TwoTubes;FixedBias
Power output
19 W
ClassAB;PushPull;TwoTubes;FixedBias
Total distortion
1.5 %
ClassAB;PushPull;TwoTubes;FixedBias
Grid AC voltage at full modulation
21.5 V RMS
ClassAB;PushPull;TwoTubes;FixedBias
Maximum plate dissipation per tube
9 W
ClassAB;PushPull;TwoTubes
Plate voltage
375 V
ClassAB;PushPull;TwoTubes;SelfBias
Screen voltage
250 V
ClassAB;PushPull;TwoTubes;SelfBias
Quiescent plate current per tube
24 mA
ClassAB;PushPull;TwoTubes;SelfBias
Full-modulation plate current per tube
29 mA
ClassAB;PushPull;TwoTubes;SelfBias
Quiescent screen current per tube
3.5 mA
ClassAB;PushPull;TwoTubes;SelfBias
Full-modulation screen current per tube
4 mA
ClassAB;PushPull;TwoTubes;SelfBias
Common cathode resistor
540 Ω
ClassAB;PushPull;TwoTubes;SelfBias
Optimum plate-to-plate load
15000 Ω
ClassAB;PushPull;TwoTubes;SelfBias
Power output
14 W
ClassAB;PushPull;TwoTubes;SelfBias
Total distortion
5.2 %
ClassAB;PushPull;TwoTubes;SelfBias
Grid AC voltage at full modulation
16.5 V RMS
ClassAB;PushPull;TwoTubes;SelfBias

Data set 02

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

Application
Audio output

Data set 03

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate-to-plate load resistance
9 kOhm
ClassB; TwoTubes
Power output
19 W
ClassB; TwoTubes
Power output
14 W
ClassAB; TwoTubes

Capacitance

Anode-grid capacitance
<1.5 pF