Marshall 900 4100 Series Custom Retube Kit

Custom Kit

Want it your way? The "Custom Kit" is just that, you get to choose all of your preamp tubes! We give you all the positions and you fill them! We left the quantity fields open so that spares or multiple tubes could be ordered to experiment with. The default power tubes are the JJ 6L6GC's or you can configure the kit to use the JJ 5881's but if your 4100 series Marshall came with EL34's or the amp has been modded to use EL34's (Screen grid resistors & bias resistor swap) then you can choose from EL34's, E34L's, 6CA7's or KT77's.

Custom Kit

Power-Tubes

We recommend using the JJ 6L6GC's or the JJ 5881's if your amp came with 5881's. But if your 4100 series Marshall came with EL34's or the amp has been modded to use EL34's (Screen grid resistors & bias resistor swap) then you can choose from JJ EL34II's, EL34's, E34L's, 6CA7's or KT77's. Please see click on the "More Details" button to get an in-depth description of the tonal differences.

6L6GC Matched Quad -

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5881 Matched Quad -

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E34L Matched Quad -

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EL34II Matched Quad -

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6CA7 Matched Quad -

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KT77 Matched Octet -

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EL34 Matched Quad -

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EuroDamper Tube Damper Rings

Combo amps are very hard on tubes because of vibrations which can cause tube rattle with any brand of tube. If your amp is the combo version and you play by yourself in a quiet environment or record with your amp you may want to consider using the EuroDamper tube damper rings. If your amp is the combo version then please let us know in the comments section. All Combo amp Retube Kits are shipped with the Eurotubes Double Mica 6L6GC’s at no extra charge. JJ Electronic started building us a proprietary version of their 6L6GC (the 6L6GC-DM) in 2005 with extra layers of mica. This reinforces the plate structure and all but eliminates tube rattle symptoms. For all other tubes such as, EL34’s, KT77's, 6CA7's and E34L’s, we recommend using our EuroDamper rings.

EuroDamper Large - Set of Four -

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Bias Probes and Multimeters

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.

Eurotubes “Pro One” Bias Probe for octal power tubes -

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Eurotubes Octal Bias Probe -

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Cables-

These are made in-house from USA made real 10 Gauge oxygen free copper cable and high quality heavy duty 1/4" jacks. These cables leave no frequency unheard!

Eurotubes 10 Gauge 3 foot Speaker Cable -

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Eurotubes 10 Gauge 6 foot Speaker Cable -

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Configure: Marshall 900 4100 Series Custom Retube Kit