07-31-2012, 06:42 AM
Just to look at them I'd say there ok. The true test is will they align properly when you go to tune up the set. The mica is just used as a spacer/insulator. If the mica is badly broken the trimmer will short thus rendering that stage inoperative. They are fairly small like 10-20pf and they do come apart with a solder iron.
Terry
Terry