4066A

Indirectly heated high-gain pentode for substantial voltage-amplifier service, using an unusual 4 V, 2 A heater.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: M7A
Base pins: 7
Nominal heater: 4 V / 2 A

Description

4066A is a indirectly heated pentode. The Standard Valves sheet publishes construction, electrical constants, limiting conditions, and applicable operating data.

Socket description

British/European 7-pin

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: M7A
Base pins: 7
Nominal heater voltage: 4 V
Nominal heater current: 2 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

Plate resistance: 60000 Ω
Amplification factor: 600
Max plate voltage: 250 V
Max screen voltage: 250 V
Max cathode current: 40 mA

Published ratings and characteristics promoted from approved datasheet.

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

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Grid-anode capacitance
0.6 pF
Published capacitance
Input capacitance
17.5 pF
Published capacitance
Output capacitance
10.3 pF
Published capacitance