One more comment - Dovetrons are so unstable the mark and space tuning needs to be checked every week or so. I bought a dual function generator

That always sits on 2125 and 2295 sine waves which can be switched or patched into either Dovetron. You cannot tune them on, for example, ITTY. Every time you will end up with both filters on the same frequency.

The space pot on my civilian unit is dirty. I need to pull it out of the rack and clean the pot one of these days.

Tom   N3CRK