Typical vacuum 5971 with calibration valve open?
Posted: Mon Oct 22, 2018 11:28 pm
I did the triode mod on my 5971. It turns out the triode tube on the 5973 works just fine in the 5971 fitting and my big old vaccuum tube was dead. So, it works great. Swapping the triode in means you have to have the 59864B controller.
Its been a few years since my 59822B controller or tube went bad and I forget what sorts of vacuum numbers I used to see on this diffusion pump system.
What sort of vacuum should I be able to get with my calibration valve open? I have been seeing apparent vacuums of 2.9E-5 Torr with the valve closed and it zooms right up to about 1.1E-4 with the valve open. My 5973 goes from 2.9E-5 to ~4E-5 Torr when I have the calibration valve open.
So, is the 5971 just that much more sloppy? Or should I suspect a leak? Guess its time to buy some canned air.
Its been a few years since my 59822B controller or tube went bad and I forget what sorts of vacuum numbers I used to see on this diffusion pump system.
What sort of vacuum should I be able to get with my calibration valve open? I have been seeing apparent vacuums of 2.9E-5 Torr with the valve closed and it zooms right up to about 1.1E-4 with the valve open. My 5973 goes from 2.9E-5 to ~4E-5 Torr when I have the calibration valve open.
So, is the 5971 just that much more sloppy? Or should I suspect a leak? Guess its time to buy some canned air.