When you recap a old amp you always get a difference in tone. It be tighter and louder. One man who get his Premier 50 back recapped said i destroyed his amp. It be too modern in sound. I had used standard values in caps and built a 40+10+10 with sprague atom electrolythic caps and and a 63 Volt 22mfd cathode bypass cap.
I cut out the bypass cap and he liked it better.
If you go up to 40+20+20+20 you will hear difference from how it is now. But no hearable difference from a 40+10+10+20.
And you could use the left over 20 uf to a bypass cap without problems.