Need some new glass? This is our Standard Retube Kit for the Egnater Tweaker Heads and Combo Amps. It contains three ECC83S's one being current balanced for the phase inverter in V3. The default power tubes are a matched pair of JJ 6V6S's but if you remove the vent on the Tweaker Heads you can configure this kit to use almost any set of power tubes including the JJ EL34II's, EL34’s, KT77’s, Big Bottle 6CA7’s, JJ 6V6S's, 5881's, 6550's, KT66's or KT88's by clicking on the "Customize" button! Note: Tweaker combo amps place the tubes horizontally and they just barely clear the speaker (poor design) so we do not recommend using the big bottle tubes such as KT66's, 6550's and KT88's!