Fender 57 Twin Retube Kits

Fender 57 Twin Full Retube Kits. Regardless of your style and application we have you covered!

All of our 57 Twin full Retube Kits are designed specifically for these amps. Every kit is configured to provide a specific sound/experience.

The Default power tubes for these kits use the Special Double Mica version of JJ’s 6L6GC-DM (found only at ET). The Double Mica modification has no effect on the sonics of the tube, it simply helps to reinforce the internal assembly to minimize the chance of tube rattle. However you can use the Power Tube drop down to select the JJ 5881’s. The JJ 6L6GC-DM’s will maintain the OEM headroom/breakup point for the output stage. 6L6’s are known for their bold cleans, deep bass, crystalline highs, and naturally scooped mids. The JJ 5881’s will drop the output power by about 20%. 5881’s have less bass extension, a crunchier mid-range, and bright jangly highs that compress when pushed.

The Standard Retube Kit is as close to OEM as possible. Maintaining the amps stock level of headroom and gain while providing a warm but even handed overall sound. The kit includes one matched pair of JJ 6L6GC-DM’s by default, two JJ 5U4GB Rectifiers and four Standard JJ ECC83S’s.

The Gold Pin Retube Kit uses the JJ ECC83S Gold Pin variants to provide a smoother, creamier, and more singing overall sound. This option is less aggressive and has less “teeth” when driven hard. If you like a classic raunchy gritty overdriven tone, we recommend looking elsewhere… If sweet, open, and more refined is what you’re after this kit will do it. The kit includes one matched pair JJ 6L6GC-DM’s by default, two JJ 5U4GB Rectifiers and four Standard Gold Pin JJ ECC83S’s.

The ECC803S Option Retube Kit The JJ ECC803S is a long plate 12AX7 variant. These are a little lower in gain than the go-to JJ ECC83S. They have a very fat mid with more top-end which gives them a very vintage tone with lots of chime. This kit contains a matched pair of the JJ 6L6GC-DM’s by default, two JJ 5U4GB Rectifiers, two Standard ECC83S’s for V3 – V4 and two Standard Long Plate JJ ECC803S’s for V1 – V2.

The ECC803S Gold Pin Option Retube Kit A vintage vibe with more chime and a smoother overdriven sound. This kit contains a matched pair of the JJ 6L6GC-DM’s by default, two JJ 5U4GB Rectifiers, two Standard Gold Pin ECC83S’s for V3 – V4 and two Standard Long Plate Gold Pin JJ ECC803S’s V1 – V2.

NOTE: The preamp tubes can be installed in any order, these amps use a cathodyne phase inverter.

**These amps are adjustable bias, and the bias should be checked and adjusted as necessary anytime you swap power tubes. All you need to adjust the bias on a 57 Twin is a bias probe and a multimeter or the Eurotubes “Pro One”. You can use the Deluxe Reverb bias video for reference. We typically bias 57 Twins between 35 to 40mA with the JJ 6L6GC’s and 30 to 35mA for 5881’s.