This is our Standard Retube Kit for the Bogner Goldfinger 90 Heads. It uses an ECC83S in V1, a standard Long Plate ECC803S in V2, a current balanced ECC803S in V3 for the phase inverter, an ECC81 in V4 and a standard ECC83S in V5. 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 or Big Bottle 6CA7’s by clicking on the "Customize" button.