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TRANSISTORS_FOR_OSCILLATOR_AND_IF_TUBES

2016-05-08 04:02  
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TRANSISTORS_FOR_OSCILLATOR_AND_IF_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, V4 uses dual-cascode MOSFET,with CR2 and zeners providing highvo ltage protection from keyed grid. Carrier oscillator V5B uses single low-voltage high-p JFET with zener voltage regulator in original grounded plate oscillator circuit. High keyed-ground voltages are isolated by CR3 and B16. Automatic level control amplifier V5A is single high voltage transistor. R14 synthesizes 12AX7 late resistance, to maintain same audio time response.-H. J. Sartori, Solid-Tubes-a New Life for 0ld Designs, 0ST, April 1977, p 45-50.