I recently bought a used Vibrolux clone and while I love the amps overall sound, the reverb is killing me. It's very touchy trying to dial in a little to medium verb, because once you get to 3 it takes a big jump into some seriously surfy territory. On 5, it sounds like the usual Blackface verb on 10. Past 5 and it just gets WAY over the top and at 10 it's just ridiculous and totally unusable. FYI...The tank is a 17", 3 spring Accutronics. I've read a few threads on the web saying that substituting a 12AU7 for the 12AT7 in V3 can help tone the verb down and give the pot a more gradual taper. Before I drop $25.00 or more on a NOS 12AU7, I wanted to check in here and see if this is a viable solution. Whatcha think, techies? Will this work? Thanks for any help in advance!!!