ACT28A

Industrial transmitting power triode intended for RF amplification, oscillation, or modulation. Manufacturer data emphasize substantial plate power, professional transmitter operation, and construction suited to continuous high-power service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 16 V / 7.3 A

Description

The ACT28A is a forced-air-cooled disc-seal pulse-oscillator triode for pulsed or continuous-wave operation up to about 600 MHz, with very high pulse output capability.

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: 16 V
Nominal heater current: 7.3 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: 0.05 S
Max plate voltage: 13000 V
Max plate dissipation: 1500 W

Published maximum ratings and characteristics audited; remaining useful numerical data retained in TUBE_SECTION_PARAMETER.

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

The ACT2
8
The ACT28A is a triode with an indirectly heated oxide coated cathode intended for use
as an oscillator at frequencies up to
600 MHz
as an oscillator at frequencies up to 600Mc/s under pulsed or c.w. conditions. A pulse
output of about [1]
300 MHz
output of about 300kW per valve is attainable at 220Mc/s.
output of about [2]
220 MHz
output of about 300kW per valve is attainable at 220Mc/s.
V, (pulse)
13
V, (pulse) 13 kV
Iagav) (during pulse)
50
Iagav) (during pulse) 50 A
Anode line i.d [1]
4
Anode line i.d.: 4-75in. Grid line o.d.: 4in,
Anode line i.d [2]
-75
Anode line i.d.: 4-75in. Grid line o.d.: 4in,
Anode line i.d [3]
4
Anode line i.d.: 4-75in. Grid line o.d.: 4in,
Frequency [1]
200 MHz
Frequency: 200 400 400 600 Mc/s
Frequency [2]
400 MHz
Frequency: 200 400 400 600 Mc/s
Frequency [3]
400 MHz
Frequency: 200 400 400 600 Mc/s
Frequency [4]
600 MHz
Frequency: 200 400 400 600 Mc/s
Air flow to anode [1]
150
Air flow to anode: 150cu.ft./min. at 3in. water gauge
Air flow to anode [2]
3
Air flow to anode: 150cu.ft./min. at 3in. water gauge
Air flow to grid seal
20
Air flow to grid seal: 20cu.ft./min.
Published value
2
2 Grid contact