If it ran cold, nobody told me. There was basically no thermal conduction from the DIP opamps to the hand-wired ceramic slab. Gain was unity, so 2nd stage (room temp) noise would overpower even a zero-noise input stage.
It had terrible birdies from fluorescent light ballasts, AM stations, everything. The spectrum was a picket fence of spikes above the already terrible noise floor.
I wonder if an OPA627 will work at cryo temps.