Sorry for latest reply, customer visit and meeting everyday.....need to get more $ for Q4 order.
For my clock, the Accuracy is 2ppm. Jitter is < 3 ps.
Accuracy is not more important in the clock, the most important thing is jitter as I explain in the CD course class I and II.
For the voltage, the TCXO device (siliver colour) is 5V, but I adding a post regualtor (super regulator) for TCXO, the supply voltage is 12V.
You can adding additional transformer + rectifier to this. No need extra LM317. Simple 8.5V AC transformer + full bridge rectifier + capacitor to my board is OK.