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Modulation transformer radios like the 29, pump out up to 35-40 volts peak to peak to the final. My take on the mosfet mod is to “volt” the final and prop up a voltage divider to the gate to drop 3.5 volts from a 8v TX source. Treat the final as a PA stage rather then a modulated stage, maybe even modulate the predriver. Just another way of doing things