The forced air cooled 3CX1500A7 electronic tube works at a frequency of 250MHz and the anode dissipation is 1500W. In audio or radio frequency applications including VHF, the tube can be used as a cathode-driven Class AB2 or B amplifier or a cathode-driven plate modulated Class C amplifier. When used as a linear amplifier, it can obtain high power gain and low intermodulation distortion. Tubes of this power capacity have low grid capture and high amplification factors, so the drive required is extremely small.
Specifications:
Filament Voltage……5V
Filament Current……10.5A
Amplification Factor……200
Trans-conductance（Ia=1.0A）……≥ 55mA/V
Interelectrode Capacitances (Grounded-cathode)
Input……38.5pF Feedback……10.2pF Output……0.1Pf
Frequency……250MHz
Mounting......any
Cooling……forced air
Temperature at sealing joint……250℃
Length……102.2mm
Diameter……85.85mm
Weight……0.7kg
Maximum ratings:
Anode Voltage……4kV
Anode Current……1A
Anode Dissipation……1.5kw
Grid Dissipation……25W
Frequency……250MHz
Typical conditions:
1. cathode driven Class AB2 linear amplifier, 30MHz
|
Anode Voltage
|
2700
|
3500 V
|
|
Cathode Voltage
|
＋8.2
|
＋8.2 V
|
|
Zero Signal Anode Current
|
92
|
182mA
|
|
Single-tone Signal Anode Current
|
740
|
1000 mA
|
|
Dual-tone Signal Anode Current
|
480
|
675 mA
|
|
Single-tone Signal Grid Current
|
40
|
74 mA
|
|
Dual-tone Signal Grid Current
|
16
|
25 mA
|
|
Peak Driving Power
|
40
|
64 W
|
|
Single-tone Effective Power Output
|
1085
|
2035W
|
|
Resonant Load Resistance
|
1820
|
2000Ω
|
|
IMD3
|
-40
|
-38dB
|
|
IMD5
|
-41
|
-41dB
|
2. Cathode driven Class AB2 amplifier, 220MHz
Anode Voltage……2500V
Cathode Voltage……+8.2V
Anode Current……1A
Grid Current……10mA
Driving Power……64W
Effective Output Power……1500W
Gain……14dB
3. Plate modulation, cathode-driven class C RF power amplifier, 30MHz
Anode Voltage……2400V
Cathode Voltage……+22V
Anode Current……0.6A
Grid Current……45mA
Driving Power……41W
Effective Anode Output……1000W
Gain……14dB
