3CPX800A7

High-mu power triode for substantial RF amplification and transmitting service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: E11-81
Socket code: E11
Base pins: 11
Nominal heater: 13.5 V / 1.5 A

Description

he SvetlanaTM 3CPX800A7 is a high performance ceramic/metal high-mu power triode designed for use in communications and industrial service. The principal use is for pulsed RF amplifier, pulse modulator, or regulator service. When operated as a pulse modulator, the Svetlana 3CPX800A7 will hold off a maximum plate voltage of 4500 volts. Maximum plate current is 8 amps at a pulse duration of 100 microseconds. The Svetlana 3CPX800A7 is a direct replacement for the model 3CPX800A7 manufac- tured in the United States. Characteristics Svetlana Outline drawing Electrical Cathode: Oxide-coated unipotential Index (aligned with missing base pin) Heater Voltage (AC or DC) 13.5 ± 0.6 V B Heater Current @ 13.5V 1.5 A J Minimum warm-up time 3 min. Amplification factor (average) 200 K Maximum Frequency for Full Ratings 500 MHz Interelectrode capacitances, with grid grounded: ANODE C Input 25.5 pF E A Output 6.1 pF Grid (Contact Plate-Cathode 0.04 pF outer cylindrical F D sufaces only) Mechanical G

Socket description

Large-wafer Elevenar 11-pin with ring

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: E11-81
Socket code: E11
Base pins: 11
Nominal heater voltage: 13.5 V
Nominal heater current: 1.5 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

E11-81 - 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

Amplification factor: 200
Max plate voltage: 4500 V
Max plate dissipation: 800 W
Max grid dissipation: 4 W
Max cathode current: 8 A

Promoted maximum ratings and characteristics from source; additional published values retained as 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

199X Svetlana

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater Voltage (AC or DC) 13.5 ±
0.6 V
When operated as a pulse modulator, the Svetlana 3CPX800A7 will hold off a
Heater Current @
13.5 V
When operated as a pulse modulator, the Svetlana 3CPX800A7 will hold off a
Minimum warm-up time
3 min
When operated as a pulse modulator, the Svetlana 3CPX800A7 will hold off a
Maximum Frequency for Full Ratings
500 MHz
When operated as a pulse modulator, the Svetlana 3CPX800A7 will hold off a
Input
25.5 pF
When operated as a pulse modulator, the Svetlana 3CPX800A7 will hold off a
Output
6.1 pF
When operated as a pulse modulator, the Svetlana 3CPX800A7 will hold off a
Plate-Cathode
0.04 pF
When operated as a pulse modulator, the Svetlana 3CPX800A7 will hold off a

Other

Plate Dissipation
800 W
Maximum ratings, Pulse Modulator or Switch Tube Service
Grid Dissipation
4 W
Maximum ratings, Pulse Modulator or Switch Tube Service
DC grid current (average)
60 mA
Maximum ratings, Pulse Modulator or Switch Tube Service
Plate voltage
4500 V
Typical Operation Svetlana
Pulse plate current
5 A
Typical Operation Svetlana
Grid voltage
-50 V
Typical Operation Svetlana
Pulse positve grid voltage
70 V
Typical Operation Svetlana
Pulse grid current
200 mA
Typical Operation Svetlana
Pulse drivng power
25 W
Typical Operation Svetlana
Pulse output power
20000 W
Typical Operation Svetlana
Pulsed Maximum Ratings (to
500 MHz
Pulsed Maximum Ratings (to 500 MHz)
DC plate voltage
3500 V
Pulsed Maximum Ratings (to 500 MHz)
Plate current (average)
600 mA
Pulsed Maximum Ratings (to 500 MHz)
Peak plate current (average during pulse)
2.5 A
Pulsed Maximum Ratings (to 500 MHz)
Plate dissipation (average)
800 W
Pulsed Maximum Ratings (to 500 MHz)
Grid current (average)
60 mA
Pulsed Maximum Ratings (to 500 MHz)
Grid dissipation (average)
4 W
Pulsed Maximum Ratings (to 500 MHz)
DC plate voltage
3500 V
Typical Operation
DC cathode voltage
15 V
Typical Operation
Zero signal plate current
20 mA
Typical Operation
Pulse grid current
105 mA
Typical Operation
Cathode input impedance
30 ohms
Typical Operation
Power output
6000 W
Typical Operation
Resonant load impedance
660 Ohms
Typical Operation