Marshall EL34 50/50 Power Amp Retube Kits

The Marshall EL34 50-50 Power Amp Retube Kits.

All of our Marshall EL34 50-50 Power Amp 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 Marshall EL34 50-50 Power Amp 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.

The bias pots are accessed from the bottom of the amp, there are four small holes and the two outside holes on each side are the bias trimmers. We use bias probes to test and set the bias on these amps. You can bias one tube on one side and then one tube on the other side.

The Standard Retube Kit is very close to OEM, however thru the years the JJ E34L has become our default option. The kit includes one matched quad of JJ E34L’s by default, two Matched and Balanced JJ ECC83S to replace the 12AX7’s and two Matched and Balanced ECC81’s to replace the 12AT7’s.

The Gold Pin Retube Kit uses the JJ ECC83S Gold Pin variants to provide a smoother, creamier, and more singing overall sound. The kit includes one matched quad of JJ E34L’s by default, two Matched and Balanced Gold Pin JJ ECC83S’s to replace the 12AX7’s and two Matched and Balanced Gold Pin ECC81’s to replace the 12AT7’s.