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3CX3000A7
The 3CX3000A7 high-mu forced air cooled power triode provides realtively high power output as an amplifier, oscillator, or modulator at low plate voltages. The tube has a low inductance cylindrical filament tank circuit for VHF operation. Operation with zero grid bias in many applications offers circuit simplicity by eliminating the bias supply. Grounded-grid operation is attractive since a power gain of over twenty times can be obtained.
Characteristics
|
Plate Dissipation (Max.) |
4,000 Watts |
|
|
Screen Dissipation (Max.) |
--- Watts |
|
Grid Dissipation (Max.) |
225 Watts |
|
Frequency for Max. rating (CW) |
110 MHz |
|
Amplification Factor |
160 |
|
Filament/Cathode |
Thoriated Tungsten |
|
Voltage
Current
|
7.5 Volts
51.5 Amps |
|
Capacitance |
Grounded Cathode |
|
Input
Output
Feedthrough
|
38.0 pf
0.6 pf
24 pf |
|
Capacitance |
Grounded Grid |
|
Input
Output
Feedthrough
|
38.0 pf
24.0 pf
0.6 pf |
|
Cooling |
Forced Air |
|
Base |
Special, coaxial |
|
Air Socket |
--- |
|
Air Chimney |
--- |
|
Boiler |
--- |
|
Length |
9.00 in; 228.60 mm |
|
Diameter |
4.15 in; 105.50 mm |
|
Weight |
6.2 lb; 2.8 kg |
|
|
Maximum Ratings |
Typical Operation |
|
Class
of
Operation |
Type of Service |
Plate Voltage (Volts) |
Plate current (Amps) |
Plate Voltage (Volts) |
Screen Voltage (Volts) |
Plate Current (Amps) |
Drive Power (Watts) |
Output Power (kiloWatts) |
|
C |
Cathode Driven RF Ampifier |
5,000 |
2.5 |
4,800 |
--- |
1.5 |
435 |
5.5 |
|
AB2 |
Cathode Driven RF Linear Amplifier |
5,000 |
2.5 |
4,800 |
--- |
2.0 |
410 |
7.26 |
|
AB2 |
Grid Driven RF Amplifier Linear Amplifier |
5,000 |
2.5 |
4,000 |
--- |
0.74 |
11.5 |
1.13 |
| |
AM Service |
|
|
|
|
|
|
|
|
AB2 |
Grid Driven AF Amplifier or Modulator |
5,000 |
2.5 |
4,000 |
--- |
3.6 |
115 |
10.5 |
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