Huh, MB... of course that probability of oscillations is larger in the circuit consists of one tube and two mosfets then in the circuit with just one tube. But, it`s a simple circuit(s), and there`re no reason why we couldn`t make it to work properly... Grid stoppers - they have impact on sound, larger values sounded more "soft" and "rolled off". I used 1kOhms on both driver and power tube position, but now I lowered this. Currently I`m using 560 Ohms on 300B grid and 150 Ohms on 12SN7- why? I have those on hands... The "goal" is the minimum value that can still performs its job - to "damp" the resonant circuit consists of (Miller) input capacitance and inductance in the grid wiring.
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