[Hallicrafters] SX 42 capacitor question

[chandlerh2 at aol.com]

i am recapping my sx 42 which   i have working great now i am about halfway 
through the process . i removed the bottom cover of the transformer  to put in 
new line caps and the caps that are in there look like mica caps.

they are about 3qtr by 3qtr square black  have the name TOBE on them are 
10000 MMF
and are rated at 600 volts should i leave them there  since  i think they are 
mica caps ???

thank you for info 

steve