C12K Ceramic Vintage 8Ohm : Revived an old amp

I have an 80's Fender concert which had a dull sounding Eminence speaker fitted in it. I recently tried the amp with a lower power Jensen extension speaker and it sounded awesome so I bought this. Straight out of the box it was a bit stiff/tight but after an hour or so it was starting to sound much closer to what I'm looking for and I'm sure that with a few more hours use it will get better and better. On the clean channel it is fairly crisp but full sounding while on the overdrive channel it stays crisp but not harsh and stays fairly tight on the bass end. It still sounds like a Fender which is exactly what I wanted. I tried a V30 in the amp too which sounded good for overdrive but not so good clean. The Jensen on the other hand seems to be good at both.