This is the Standard Retube Kit for the Mesa 295 Power Amp. The preamp section uses three Matched and Balanced ECC83S's. The default power tubes are a matched quad of the JJ Electronic 6L6GC’s and a matched quad of the JJ E34L's. With the Customize option you can configure this kit to use a matched quad of the 6L6GC along with a matched quad the JJ KT77’s or the Big Bottle 6CA7’s.
These amps are fixed bias with no adjustment. The 290 is a Simulclass amp and can run a quad of 6L6GC's along with a quad of EL34's, E34L's, KT77's and 6CA7's.