The tube is externally identical to the 4CX250B but contains rugged internal construction features Amplification factor and cathode area have been increased over the basic 4CX250B to give higher transconductance and figure of merit.
| GENERAL DESCRIPTION |
|
The 4CX350A has a maximum plate dissipation of 350 watts and are intended for Class AB audio or RF amplifier service. The tube is externally identical to the 4CX250B but contains rugged internal construction features Amplification factor and cathode area have been increased over the basic 4CX250B to give higher transconductance and figure of merit. |
| TECHNICAL SPECIFICATIONS | |
| Plate Dissipation (Max.) | 350 watts |
| Grid Dissipation (Max.) | 0 watts |
| Screen Dissipation (Max.) | 8 watts |
| Frequency for Max. Ratings (CW) | 110 MHz |
| Cooling | Forced Air |
| Cathode Voltage Current |
Oxide-coated Unipotential 6.0 Volts 2.9 Amperes |
| Capacitances (Grounded Cath. Connection) Input Output Feed-through |
23.6 pF 5.6 pF 0.03 pF |
| Amplification Factor (g1-g2) | 13 |
| Transconductance | 22,000 µmhos |
| Base | 9-Pin Special |
| Recommended Air-System Socket | SK-600A |
| Recommended Air Chimney | SK-606 |
| Maximum Seal & Anode Core Temperature | 250°C |
| Maximum Length | 2.47 in; 62.60 mm |
| Maximum Diameter | 1.64 in; 41.60 mm |
| Weight (approximate) | 4 oz; 113 gm |
| Operating Position | Any |
| Specifications may change without notice | |
| THIS TUBE IS USED IN THE FOLLOWING SHORTWAVE BROADCAST TRANSMITTERS | ||
| Manufacturer | Transmitter specifications | Power in kW |
| Collins | 208U-10 | 10 |
| 821A-1 | 250 | |
| 821A-2 | 250 | |
| Continental Electronics | 416 D | 10 |
| 416 E | 10 | |
| HCJB Global | HC 500 | 500 |
| RIZ Transmitters | OR 5 K-01/A | 5 |
| THIS TUBE IS AVAILABLE FROM | ||
| Manufacturer | Rebuilder | Distributor |
| Covimag | Richardson Electronics | |
| Eimac | ||
| 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 |