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You can do it with a 6C6...

... the problem is you want battery bias.

This limits you to a specific cathode voltage, which will affect the gain of the tube.

IMO you would be better off by using a conventional cathode resistor of the right value and bypassing it with the correct capacitance. This will act a lot like battery bias but will allow you to set up the tube's parameters with a bit greater accuracy. Lower distortion and higher gain should be the result if you do it right.

Just off the top of my head (I work with 6SN7s a lot) if you want battery bias for sure I'm thinking that its going to be around 6-8 volts to be ideal. Also, the 75K plate load is marginal- I would go with 49.9K which will give you sufficient current for bandwidth and no worries driving the input capacitance of the 2A3.


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