Want more warmth and definition from your Heartbreaker? This is our standard Retube Kit and it contains a JJ GZ34 rectifier tube, six standard ECC83S's and a balanced ECC83S for the phase inverter in V5. A nice upgrade in tone. The default power tube selection is a matched quad of JJ 6L6GC's in a warmer grade to accommodate the fixed bias power section. With the customize option you can configure this kit to use a range of other power tubes. All configurations are hand picked to function with the specific fixed bias of the Heartbreaker. If your amp is a combo amp 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.