Diezel Einstein 50 Combo Retube Kits

The Diezel Einstein 50 Combo is a very unique amp. The different combinations of power tubes that can be run is almost endless. The kits we offer here are the most distinctive in tonal character, forged from many years of research. Every kit is configured to provide a specific sound/experience.

These are adjustable bias amps and if you use the Diezel method of removing fuses to measure bias all you need is a Multimeter. This method is a bit tedious, it’s much easier and convenient to use a bias probe and a Multimeter or our all-in-one “Pro One” bias probe that reads both the plate current and the plate voltage simultaneously.

The Diezel Einstein 50 Combo can use almost any set of power tubes including the JJ EL34II’s, EL34’s, KT77’s, Big Bottle 6CA7’s, 5881’s, 6550’s, KT66’s or KT88’s.

The default power tubes for all the Diezel Einstein 50 Combo kits are the JJ E34L’s. Thru the years the JJ E34L’s with their added punch and articulation have become a favorite here at Eurotubes and with our customers. They are very tight with an extended low end over a standard EL34. However you can use the Power Tube drop down to select the JJ EL34’s, the JJ EL34II’s, the JJ KT77’s or the JJ 6CA7’s. The JJ EL34’s are known for their mid range bloom and have a slightly looser feel when compared to the E34L’s. The JJ EL34II’s are not as aggressive as the E34L, but they are a little fuller in the lows and low mids than the EL34’s. The JJ KT77’s have an extended frequency response with big/chunky lows (even deeper than the E34L’s) and chimey/present highs. The mids are very smooth for an EL34 type tube and when driven they’re extremely rich and complex. The JJ Big Bottle 6CA7’s have big lows (on par with the KT77’s), an emphasis in the lows mids, and very round/natural highs. This gives the tube a very thick and round character that’s as close to crossing a standard EL34 with a 6L6 as you can get.

You can also use 6L6 type tubes. The JJ 6L6GC tubes follow the classic 6L6GC sonic archetype with big lows, smooth mids and crystalline highs. What sets them apart is their low end clarity, mid-range detail and very clear highs without being overbearing or harsh. The JJ 5881’s are a Classic 23 watt 5881 in a traditional stubby bottle. “Jangle” for days and a very warm full tone. Right in-between the JJ 6L6GC and the JJ 6V6S in power. If you’re looking for that early-breakup “tweed” era character these are it.

The large bottle options include the JJ KT66’s, the JJ 6550’s, and the JJ KT88’s. The JJ KT66’s are one of our favorite tubes here at Eurotubes. These tubes have a clean low end response with a forward mid-range and articulate highs. When overdriven these tubes crunch up early in the upper mids and highs resulting in an incredibly complex tone that retains excellent low end clarity (just like the originals). The JJ 6550’s are very warm with a great clean tone and the breakup is raw, crunchy, and gritty. If you want an Angus – AC/DC type tone then these tubes really deliver! They are simply a lot of fun to play. The JJ 6550 will not make quite as much power as the JJ KT88 and the KT88 is a bit thicker sounding. The JJ KT88’s are extremely thick and rich sounding, they are a very high power tube with lots of headroom, thunderous lows, thick/aggressive mids, and sweet detailed highs.

Note: If you choose to use the KT66’s, 6550’s or KT88’s and your amp has the “Bear Trap” style tube retainers you may want to swap these out for the “Spring and Cap” style retainers. These are 5.00 a pair and mount using the same screws as the stock retainers.

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 E34L’s by default, one Standard JJ ECC81 for the verb in V7, one Balanced JJ ECC83S for the phase inverter (V6, farthest from the input jack) and five Standard JJ ECC83S’s for V1 – V2 – V3 – V4 – V5.

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 E34L’s by default, one Standard Gold Pin JJ ECC81 for the verb in V7, one Balanced JJ ECC83S Gold Pin for the phase inverter (V6, farthest from the input jack) and five Standard JJ Gold Pin ECC83S’s for V1 – V2 – V3 – V4 -V5.

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 E34L’s by default, one Standard JJ ECC81 for the verb in V7, one Balanced High Gain JJ ECC83S for the phase inverter (V6, farthest from the input jack), two Standard ECC83S’s for V4 – V5 and three High Gain JJ ECC83S’s for V1 – V2 – V3.

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 E34L’s by default, one Standard JJ ECC81 for the verb in V7, one Balanced JJ ECC83S for the phase inverter (V6, farthest from the input jack), four Standard ECC83S’s for V2 – V3 – V4 – V5 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 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 E34L’s by default, one Standard Gold Pin JJ ECC81 for the verb in V7, one Balanced Gold Pin JJ ECC83S for the phase inverter (V6, farthest from the input jack), four Standard Gold Pin ECC83S’s for V2 – V3 – V4 – V5 and one Standard Gold Pin JJ ECC803S for V1 (closest to input jack).