This is the Standard Retube Kit for the Mesa Single Rec, Solo 50, Rectoverb 50 and Nomad 55. The preamp section uses five ECC83S's with one balanced for the phase inverter in V5. The default power tubes are the JJ Electronic 6L6GC’s. With the customize option you can configure this kit to use the JJ 6V6S's, KT66's, 6550's, KT88's, EL34’s, E34L's, KT77’s or Big Bottle 6CA7’s. If your amp is the combo version then please let us know in the comments section and we will ship your kit with the special Double Mica 6L6GC’s which will greatly reduce any tube rattle.
These amps are fixed bias with no adjustment other than the switch to go between EL34 mode and 6L6 mode. 6L6GC's, KT66's and KT88's are run in the 6L6 mode.EL34's, 6V6S's, E34L's, KT77's and 6CA7's are run in the EL34 mode.