Grainger's Seduction supply will be very, very close to this. I would recommend a power transformer that puts out a little less B+, as the 40ma and 65v of compliance across the device is asking a lot in terms of heat dissipation. You might check with Doc and see if you can buy an Eros transformer for such a project.
I would use something like a 6CG7 and set the forward current from the power supply to be more like 14-20ma. Also, a stabilizing zobel network after the regulator is a very, very good idea.