Marshall JVM 50 Retube Kits

The Marshall JVM 50, JVM215C, JVM205C and JVM205H series amps have been backline staples for nearly two decades.

All of our JVM 50 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 JVM 50 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.

These amps are adjustable bias and the bias must be checked and adjusted as necessary anytime you swap power tubes. If you’re using the factory test points we recommend the following settings:  35-45mV for all the power tubes listed above.

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 pair of JJ E34L’s by default, one Balanced JJ ECC83S for the phase inverter (V5, closest to power tubes), and four Standard JJ ECC83S’s for V1 – V2 – V3 – V4.

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 Balanced JJ ECC83S Gold Pin for the phase inverter (V5, closest to power tubes in the back row), and four Standard JJ Gold Pin ECC83S’s for V1 – V2 – V3 – V4.

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 Balanced High Gain JJ ECC83S for the phase inverter (V5, closest to power tubes in the back row), a Standard ECC83S for V4 and three High Gain JJ ECC83S’s for V1 – V2 – V3.