DEVELOPMENT OF LINEAR POWER TUBES.
Abstract
Tube specifications, in MIL-E-1 format, were written for the two 500 watt (PEP) ultra linear tetrodes (the X2098-B and X2098-C) are attached. The design of the conduction cooled envelope was completed, with substitution of Beryllium Oxide (BeO) ceramic for Aluminum Oxide (Al2O3) ceramic. Calculated heat dissipation capability is 647 watts total power input with 100C maximum temperature gradient, tube-to-heat sink. Experiments were performed on modified 4CX5000 and 4CX3000 thoriated tungsten filamentary tetrodes. Two different types of modified 4CX5000's with special anodes were evaluated at 2 MHz with two-tone input. One type has an abrupt anode diameter change, while the second type has a conical taper over approximately one-half the anode length. The second type had a minimum signal-to-distortion ratio of -43 db, 500 to 5000 watts PEP output, when operated at the optimum conditions. The modified 4CX3000's contained an added auxiliary electrode in the cathode region. Theoretical analysis of the grid-plate transfer curves showed that a -15 db improvement in the third order signal-to-distortion ratio is possible if the auxiliary electrode is driven by an in-phase AC signal of the proper magnitude. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1967
- Accession Number
- AD0660033
Entities
People
- Gordon E. Liljegren
- William H. Sain