If the sound you are looking for was done in the past with a stand alone reverb like the Fender 6G15 http://www.kbapps.com/audio/schemati...everb6g15.html the reverb in the amp will probably come up short. With the stand alone you can dial the output to being all reverb no dry signal. The mix in the amp will usually be approx 50% dry 50% reverb at the maximum due to in some cases feedback problems if the reverb signal is taken too high. So as Duffy stated in that case a pedal or possibly modification of the amp would be what you need to get the tone you want.