This is the Standard Retube Kit for the Mesa Stiletto Ace. The preamp section uses five JJ ECC83S's with one balanced for the phase inverter in V5. The default power tubes are the JJ Electronic E34L's which are very tight and punchy with more extension in the low end. With the Customize option you can configure this kit to use the JJ EL34’s, EL34II's, KT77’s or Big Bottle 6CA7’s. Checkout the the customize page for more details on these options. **This kit does not come with a replacement rectifier tube. If you'd like to add one you can use the Customize option and select either a JJ GZ34 or 5U4GB. We do not automatically include a replacement rectifier tube because we've found that most players use the silicone diode mode exclusively. When your're in the silicone diode mode the rectifiers filaments are connected but the tube itself is bypassed.
These amps are fixed bias with no adjustment.All our Mesa Retube Kits include power tubes that are hand selected to run perfectly in Mesa amps. We have extensive hands-on experience measuring the fixed bias points in these amps and what grade of tubes will achieve optimal performance.