Ok, back from the beer-discussion.
My voltnuttery and timenuttery stroke me by accident last saturday:
My bench is in a real mess -that's why I accidentally powered on the power supply a repaired LPRF-01 rubidium reference oscillator was connected to.
Actually I didn't repair the rubidium oscillator itself -didn't have to, expected it first though.
After beginning of debugging the somewhat unstable behaviour I revealed the trimming resistor was bad.
I swapped the old one (red arrow) with a new one and calibrated it to my GPSDO.
That was back in 2019.
See what it stabilized to (counter is syntonized to my GPSDO the rubidium oscillator was calibrated to):
I'm quite satisfied. Jumps around the LSB by 1-3 digits.
My newest acquisition in the voltnut department is a 10k Vishay foil resistor in a convenient housing.
I'm not sure, but I think I bought it from a eevblog member..
Anyway, my blue HP3456A shows stable readings of +10.00020E+3 Ohms +/-1 digit since last Saturday now.
Quite happy with that, too -since it's in spec regarding the accuracy of the resistor. Haven't taken the accuracy of the meter into the equation. Want to go to bed happily tonight. Maybe tomorrow.
Good night!