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TRANSISTORS_FOR_AF_TUBES

2016-05-08 10:17  
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TRANSISTORS_FOR_AF_TUBES
Article covers replacement of tubes in Drake T-4XB transmitter with solid-state equivalent circuits mounted in 7-pin and 9-pin miniature plugs,.Numbers identify original tube pins V1A and V2A use dual-cascode JFETs, while- operated transmitter relay control V2B and AM modulator V3 use high-voltage Darlington Q9 collector voltage is set at 150 V during standby by adjusting R9, Circuit includes first and second audio stages. Voltages indicate proper operating points. Source resistors may require adjustment.-H. J. Sartori, Solid-Tubes-a New Life for Old Designs, QST, April 1977, p 45-50.