And I'll third it. I have both a Showman Reverb and a Dual Showman Reverb, and I loves 'em both muchly.
Being that I am a sucker for 15" speakers, I daresay that I also have a newish Twin Reverb Custom 15, and I like it a lot and fearlessly recommend it, even though I also agree with BZ's assertion above; but it does come up a hair or two short when compared side-by-side with my Showman Reverb. (Nothing compares to the Dual Showman Reverb.)
Buddy, you might also consider taking that Evil Twin in to a top-flight amp guy for an overhaul. I take all my oldies to Pete Cage here in the Baltimore area, and they come out of his shop ready to rock for years on end. The good amp guys cost a lot, but they do the work right -- no crackpot mods or workarounds, everything solid and back to factory specification. I've never had to take an amp back to Pete. You want a guy like him on your contact list!
These old Fender amps -- they'll outlive us if we take care of them.
Paul/FF909