Received some of Mr Pettis' resistors during the week so finished stage 2 of a x6 DrFrank's PCB based Ltz Reference Bank
It is located above TiNs KZ PCB reference bank (plus one old 3458 LTZ reference board alone)
(The 'code' next to each output refers to
A or C - LTZ1000 A or C,
1 or 2 - op amp LT1013=1 or 2057=2
Resistors V =vishay. , U= TE's UPW series, P=Pettis Engineering
All have 2 stage linear PSUs
1st common rail LM38xx,
2nd stage each LTZ has its own TPS7A4901 ultra low noise in a separate box
All connected to mains UPS
Pomona 3770 posts for Ref 4-15
My Thanks to EEVBlog VoltNuts esp TiN, DrFrank, Edwin Pettis just to name a few.
Robert