Have you outgrown the mid scoop thing? Are you looking for a tone with FAT mids and a real sizzle? This is the ECC803S V1 Option Retube Kit for the Hughes & Kettner Coreblade. The preamp section uses a Long Plate ECC803S for V1 along with two ECC83S's with one being current 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.