I just aquired a Fender Prosonic from G.C. yesterday. To my ears, it sounds marvelous, very much like a Fender Twin. Doing a little research on line, some people love this amp, others hate it. I'd like to hear some impressions from tele players. The reverb isn't working in this amp, and all the preamp tubes are 12ax7, save for one, which is a 12at7. Can I assume that this is the reverb tube? Anything else I need to consider about diagnosing the reverb problem? Thanks in advance.