Want all the gain you can get? This is the High Gain Option Retube Kit for the Hughes & Kettner Coreblade. The preamp section uses three handpicked High Gain ECC83S's with one balanced for the phase inverter in V3. The default power tubes are a matched quad of the JJ Electronic E34L’s but you can configure this kit to use the JJ EL34II's, EL34’s, KT77’s, Big Bottle 6CA7’s, 5881's or the JJ 6L6GC's by clicking on the "Customize" button.
These amps employ an auto bias scheme so all the tubes listed are plug and play.