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ACM3

Triode for general electronic service. Available source material does not establish a narrower functional application confidently.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6 V / 1.7 A

Description

The ACM3 is a forced-air-cooled triode with an indirectly heated oxide cathode, designed for video-frequency modulator and cathode-follower service.

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 V
Nominal heater current: 1.7 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

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.027 S
Amplification factor: 14
Max plate dissipation: 2000 W

Published maximum ratings and characteristics audited; remaining useful numerical data retained in TUBE_SECTION_PARAMETER. Marconi ACM3 forced-air-cooled video-frequency modulator and cathode-follower triode, oxide-coated indirectly heated cathode. Maximum anode dissipation 2 kW. Source states maximum PEAK cathode current 2 A, which is not promoted to unrestricted maximum cathode current. Cooling required before applying supply voltages and maintained until all voltages are removed.

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

use as a video frequency modulator and cathode I
17
use as a video frequency modulator and cathode I 17 A
follower. The ACM
3
follower. The ACM 3 is not suitable for positive grid t
Cooling. The anode requires cooling by air blast. The Pa (max)
2 kW
Cooling. The anode requires cooling by air blast. The Pa (max) 2 kw
a pressure equal to a [1]
1
a pressure equal to a 1-in. head of water. The grid seal u 14
a pressure equal to a [2]
14
a pressure equal to a 1-in. head of water. The grid seal u 14
equal to a [1]
1
equal to a 1-in. head of water. All cooling supplies 6 P
equal to a [2]
6
equal to a 1-in. head of water. All cooling supplies 6 P
supply voltages, and must continue until all voltages Ce,k
20 V
supply voltages, and must continue until all voltages Ce,k 20 pF