Great,
completely miss this common connection effect ...
it consumed around 20ma "naked" and around 10-13 ma in 1in polystyrene cube
heater fluctuation around 1-2 ma ...it means .... 1-2 ppm fluctuation already taken by heater ....
if we can use, let say .... 20 , can averaging help, would it be better then 6 LM399 ( about the same $ spending ) , theoretically, putting aside of resistors and schematics inperfection ?
BTW, i did fire up just one, it gives me 6.95... cold; and 7.171... hot ; I'm wonder if higher Vout tend to higher drifting ....