Looking to warm up your Recto 25? This is our Standard Retube Kit for the Mesa Rectoverb 25 Heads and Combo Amps. It contains six ECC83S's with one being current balanced for the phase inverter in V4. The default power tubes are a matched pair of the JJ EL84's but you can configure this kit to use the JJ EL844's for an earlier breakup by clicking on the "Customize" button!