I just loaded an old career to check it.
On the TDC screen you can open the tubes by selecting tube 1 and pressing Q, switching over to tube 2 and pressing Q again etc. - and all tubes stay open and you can switch between the open tubes as you wish - they stay open.
You can check it with F12.
If you jump to the attack scope/UZO/Obs Scope screen and switch the indicated/highlighted tube - you close all tubes exept the chosen one.
A screen mod (periscope/TDC) may have unknown effects.
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