TUBE 3CX2500F3 / 8251

GENERAL DESCRIPTION


photo 3CX2500F3 The 3CX2500F3 is a medium-mu, all ceramic-and-metal, forced-air cooled, external anode power triode with a maximum plate dissipation rating of 4000 watts. High power output as an amplifier, oscillator, or modulator may be obtained at moderate voltages.
The tube has a rugged, low-inductance cylindrical filament-stem structure, which readily becomes a part of a linear filament tank circuit for VHF operation. The grid provides good shielding between the input and output circuits for grounded-grid appliciations and is conveniently terminated in a ring between the plate and filament terminals.
The 3CX2500F3 has flexible leads on the base for grid and filament connections which can simplify socketing in low frequency applications.
picture 3CX2500F3


TECHNICAL SPECIFICATIONS
ELECTRICAL
Filament
Voltage
Current @ 7.5 V
Thoriated Tungsten filament
7.5 ±0.37 V
51.5 A
Amplification Factor (average) 22
Direct Interelectrode Capacitance
Cin
Cout
Cgp
(grounded filament)
35 pF
0.9 pF
20 pF
Frequency for Maximum Rating 75 MHz
MECHANICAL
Maximum Overall Dimensions
Length (incl. fil. leads)
Diameter

18.437 In; 46.83 cm
4.156 In; 10.56 cm
Operating Position Vertical, base up or down
Net Weight (Approx) 7.0 lb; 3.2 kg
Cooling Forced Air
Base Special with Flying Leads
Maximum Operating Temperature
Anode Core & Ceramic/Metal Seals
Filament Lead/Tube Base Junctions

250°C
150°C
Specifications may change without notice

THIS TUBE IS USED IN THE FOLLOWING SHORTWAVE BROADCAST TRANSMITTERS
Manufacturer Transmitter specifications Power in kW
Gates HF-5 / HF-5 B 5
HF-10 / HF-10 B 10
BHF-10 10
HF-20 / HF-20 B 20


THIS TUBE IS AVAILABLE FROM
Manufacturer Rebuilder Distributor
Eimac Econco Richardson Electronics
Penta Laboratories






PRICE LEVEL (US$)
1 2 3 4 5 6
0 - 10 10 - 100 100 - 1000 1000 - 10,000 10,000 - 50,000 50,000 - 100,000