Dr. Z Jetta Amps

The Dr. Z Jetta Retube Kits.

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

The default power tubes for all of our Dr. Z Jetta kits are the JJ 7591S’s. The JJ 7591S’s These are a modern replacement for all classic 7591 applications. They’re warm and round with a smooth breakup. They have a very lively character which makes them extremely fun to play or listen to.

These are all adjustable bias amps and all you need to check and adjust the bias is a bias probe and a Multimeter, or our all-in-one Eurotubes “Pro One” bias probe that reads both the plate current and the plate voltage simultaneously.

The Standard Retube Kit is very close to OEM. The kit includes one matched pair of JJ 7591S’s, a JJ GZ34S Rectifier tube, one Balanced JJ ECC83S for the phase inverter (V2, closest to power tubes) and one Standard JJ ECC83S for V1.

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 to the Standard or High Gain option. If sweet, open, and more refined is what you’re after this kit will do it. The kit includes one matched pair of JJ 7591S’s, a JJ GZ34S Rectifier tube, one Balanced JJ ECC83S Gold Pin for the phase inverter (V2, closest to power tubes) and one Standard JJ Gold Pin ECC83S for V1.

The High Gain Retube Kit uses our hand picked high gain selected JJ ECC83S’s. If you’re looking for maximum crunch and grind this is where you want to be. Sonically this setup is very similar to our Standard Retube Kit but with a little extra gain on tap. The kit includes one matched pair of JJ 7591’s, one JJ GZ34 Rectifier tube, one Balanced High Gain JJ ECC83S for the phase inverter (V2, closest to power tubes), and one High Gain JJ ECC83S for V1.

The SRV Retube Kit uses the JJ 5751 in the V1 position. The JJ 5751 is a purpose built low gain 12AX7/ECC83 substitute. Stevie famously used these to eek out a little extra clean headroom, and you can too. Expect about a 25% reduction in gain, which is like having an extra click on the dial before breakup sets in. Great for clean players and pedal users. The kit includes one matched pair of JJ 7591’s, one JJ GZ34 Rectifier tube, one Balanced JJ ECC83S for the phase inverter (V2, closest to power tubes), and one Standard JJ 5751 for V1 (closest to input jack).

The Gold Pin SRV Retube Kit Smoother and richer sounding! The kit includes one matched pair of JJ 7591’s, one JJ GZ34 Rectifier tube, one Balanced Gold Pin JJ ECC83S for the phase inverter (V2, closest to power tubes), and one Standard Gold Pin JJ 5751 for V1 (closest to input jack).

The ECC803S V1 Option Retube Kit uses the Long Plate JJ ECC803S in the V1 position. The JJ Long Plate ECC803S has a little lower gain with big thick mids and a little more sparkle in the highs. The kit includes one matched pair of JJ 7591S’s, a JJ GZ34S Rectifier tube, one Balanced JJ ECC83S for the phase inverter (V2, Closest to the power tubes) and one Standard JJ ECC803S for V1 (closest to input jack).

The Gold Pin ECC803S V1 Option Retube Kit uses the Long Plate Gold Pin JJ ECC803S in the V1 position. The kit includes one matched pair of JJ 7591’s, one JJ GZ34 Rectifier tube, one Balanced Gold Pin JJ ECC83S for the phase inverter (V2, Closest to the power tubes), and one Standard Long Plate Gold Pin JJ ECC803S for V1 (closest to input jack).