As there seems to be significant misunderstanding of the problem I am addressing in this thread I shall elucidate:
1) Precise voltage doesn't matter. The tuning voltage will be varied constantly as needed.
2) Low noise and long term stability are the major requirements.
3) Any voltage to any of the devices from the mains to the OXCO supply within device tolerance is perfectly acceptable so long as it is stable. My focus is frequency, not voltage.
4) Aging effects are tractable, but not easy at 1%/1000 hrs. We shall see what I get from ebay.
5) US mains tolerance is +/- 5%, 114-126 Vrms and nominal 118 Vrms. I'm not in the mood to reprise the error propagation from the mains to the OXCO supply. You can read the LM317, LM399 and CTI OSC5A2B02 datasheets and labor thorough that yourself. I am confident that you'll arrive at similar conclusions. If I have made an error please show my error.
What matters is vanishingly low noise and predictable aging behavior from the PS to the OXCOs. Because of device aging, the Vctl voltages will require constant adjustment to achieve 0.001 ppb/yr frequency stability.
This is NOT a precision voltage reference. It is an ultra low noise, high stability power supply. Not at all the same despite shared difficulties and similarities.
Have Fun!
Reg
