DEVELOPMENT OF LINEAR POWER TUBES.
Interim development rept. 17 Feb-16 May 68,
EIMAC SAN CARLOS CALIF
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A total of nine X2012 tetrode - engineering models, using the EIMAC 4CX15,000A as a prototype, were built and tested. These models are designed to meet the requirements of Phase III 5000 to 15000 watts PEP output with a -40 db maximum third order intermodulation distortion. Of the nine engineering models built and tested, two of the tubes were X2012-Ns which proved to be the best model to date. For a given set of operating parameters, the X2012-N will give third and fifth order intermodulation distortion ratios of more than 45 db in the power output range from zero to 15000 watts ratios, but the fifth order intermodulation distortion ratio is approximately 3 db poorer than the results obtained with the X2012-N. Special tests were performed on the EIMAC 4CX15,000A and the X2012 models where screen voltage was varied linearly and in phase with the drive voltage. The effect of varying the screen voltage is to lower the zero signal plate current. A 7 per cent reduction in screen voltage at the idling point results in a 40 per cent reduction in zero signal plate dissipation. The intermodulation distortion ratios for the X2012-N are at least 42 db third order and 47 db fifth order when operated under this varying screen voltage conditions. Author
- Electrical and Electronic Equipment
- Manufacturing and Industrial Engineering and Control of Production Systems