Looking for a vintage vibe with FAT mids and a real sparkle? This is the ECC803S V1 Option Retube Kit for the Jet City 100H and 100HDM Amps. The preamp section uses a JJ Long Plate ECC803S for V1 for a little lower gain with big thick mids and a little more sparkle in the highs along with four ECC83S with one being current balanced for the phase inverter in V5. The default power tubes are a matched quad of the JJ 6L6GC's but you can configure this kit to use the JJ KT66's or even the JJ 5881's to drop the power output a couple decibels by clicking on the "Customize" button!