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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: I'm open to suggestions and a CCS would be something i'd like to try

Something is not adding up here.

If you look at the plate curves for a 7a4 at the spot where 115 volts plate and -3 volts bias intersect. That shows about 4.5ma. plate current.

4.5ma of current across 80k ohms will drop 360 volts.

To end up with 115 volts at the plate you would have to start with a 475 volt supply feeding the top of the plate resistor.

As for CCS......DN2540 are cheap. $1.42 each at Mouser.

Check the link below.

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