Want a very smooth rich tone with less grit for your Classic 20? This is our Gold Pin Option Retube Kit and it contains a matched pair of JJ EL84's for power along with a standard Gold Pin ECC83S for V1 and a graded high current Gold Pin ECC83S for V2. Just let us know in the comments section if you're looking for max headroom, moderate or an early breakup so we can select a proper grade for the power tubes.