Darwin, those aren't covers either that whole thing is the magnet my 2x12 cab weighed over 80lbs, too much to lug around and too loud for the venues we were playing. They sure did sound good though, sold them to a studio maybe they'll be on a hit album someday!
Case, I went with the 10F150 and the 10A125. I think we have the same amp '79 vibrolux reverb, mine had reissue Jensens in it they were ok but lacking low end and the highs were thin too. Then I went to a pair of weber Sig series (10 + 10s both ceramic) whichever one was the smooth cone I didn't like and sold, replaced with the 10f150 that I got for a steal on CL. I really liked the combo of Sig series and 10f150 but felt like the Sig was getting over powered (less efficient) so bought the 10a125 based on lots of forum searching. I was sadly disappointed at first, that switch left me with farty bass. On a whim I swapped tubes from NOS 6L6wgb's to sed winged =c= and the bass is much improved.
Anyway, if the CTS aren't doing it for you the signature series is a great option or a tube swap may be what you need. I've never had the chance to hear this amp with the original speakers,regardless I'd hang on to them...or you could always send them my way
