The valve circuit can be done with a +/- 200V supply fairly easily with cheap valves.

For the input circuit, a triode strapped 6EJ7 and a pentode rigged 6EJ7 would be great. ~$3/tube too

Now for the CCS for this cascoded cathode follower to work into. Single pentode perhaps? 6CL6 or an EL84 or any of the similar sized 9-pin pentodes would do. One could get nuts with a regulated g2 supply, but a dropping R and bypass C would be quite good as well.

The beauty of the MOSFET sol'n is that we could do it with +/- 30V and DN2540N5's. Or a -30 supply with a MOSFET cathode load and valves on top. This I am going to build soon. I have a request from a very good friend back in PA for just such an item. I think I'll do it with Intact Audio ( Dave Slagle ) Autoformer volume controls if he'll foot the bill...
regards,
Douglas