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grid stop

Nice circuit, but Allen is Right (pardon the pun), you'll need to get rid of the shielded hookup between the attenuator and the grid. So layout will be important for low noise.

Also- the grid input needs a grid stop resistor (about 1-5K) as close to the tube as possible! I would also recommend playing with the 680 ohm cathode resistor- offhand given a mu of 35 the value seems a little low, but OTOH a lot depends on the semiconductor plate load. If it were me, there would be no way I would allow the semiconductor devices into the circuit....


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