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Umm, that won't work.

Installing a 1N4148 or equ as shown would severely limit the gate-bias voltage to Q74's gate, well below any anticipated Vth.

This does ring a bell, but I think a 5.1-Volt zener goes into the D15 spot, but turned the opposite way shown. Anode to ground, cathode to the trimpot.

Pretty sure. And if my copy of this is on paper only, might be a real archaeological dig to locate it.

73

[QUOTE="nomadradio, post: 633848, member: 22"] Umm, that won't work. Installing a 1N4148 or equ as shown would severely limit the gate-bias voltage to Q74's gate, well below any anticipated Vth. This does ring a bell, but I think a 5.1-Volt zener goes into the D15 spot, but turned the opposite way shown. Anode to ground, cathode to the trimpot. Pretty sure. And if my copy of this is on paper only, might be a real archaeological dig to locate it. 73 [/QUOTE]

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