Want a very rich and smooth tone with less grit? This is the Gold Pin Option Retube Kit for the Budda Superdrive 80 Amps. The preamp section uses three Gold Pin ECC83S's with one balanced for the phase inverter in V3. The default power tubes a matched quad of the JJ Electronic 6L6GC’s but you can configure this kit to use the JJ 6550's by clicking on the "Customize" button.
These are cathode bias amps so there is no adjustment to be made and you can switch from 6L6GC's to 6550's.