Re: Nuvistors

 

Now that I think about it I bet some of these triodes could be replaced with depletion mode N channel FETs. In fact the ones I've seen in the front ends of scopes are common plate so all they do is provide near infinite input impedance, no voltage gain involved. The info I happen to have handy for the 422 has them running with only 20 volts on the plate. I know FETs can handle that.

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