Mesa Boogie Full Revalve Kits / Mesa Bass 400+ 6L6GC Groove Tube GE RI Classic Full Upgrade Kit

Mesa Bass 400+ 6L6GC Groove Tube GE RI Classic Full Upgrade Kit Mesa Bass 400+ 6L6GC Groove Tube GE RI Classic Full Upgrade Kit Click on image(s) above to view larger
£426.00
£340.80

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All prices contained on this page are exclusive of VAT. This is currently charged at 20% and is payable by the UK only.

These are specially selected full revalve kits for Mesa Boogie owners. The sets consist of specially position selected pre amp valves that have been selected for each position in your Mesa. We have 2 pre amp kits, Standard gain, to give a warm and fat overdrive and Our Classic kit provides boogie owners with a valve close in tone to the vintage Mullard ECC83. In terms of 6L6GC we have selected sets available that will work with the boogies fixed bias arrangement. Certain 6L6GC will be better for certain kinds of music and these we have indicated in our product description.
20% Discount


This full revalve kit consists of specially selected Harma ECC83 Retro pre amp valves and Groove tube 6L6GC GE reissue output valves which have been burst tested and selected for Mesa Boogie amplifiers.

This set has been designed to give your Mesa more top end transparency and the classic warm tone which many players require out of their Mesa amplifiers.

The pre amplifier valves are specially selected for Mesa amplifiers for low microphonics and gain and the kit includes a balanced valve for the phase inverter position.

The output valves have been specially burst tested under real working conditions to ensure the utmost reliability. The output valves have also been specially selected to run with Mesas non- adjustable fixed bias arrangement.

The Harma ECC83 Retro pre amp valves offer more harmonic warmth with more transparency in the midrange than 12AX7 Russian 2 or the Electro Harmonix 12AX7. The outstanding feature of the Harma ECC83 Retro is its smooth linear midrange response and clarity. So you get a smooth warm sound with tight fat punchy lows. This has become our most popular pre amp valve for Mesa amplifiers.

The Groove Tubes 6L6GC GE is a re issue of the famous clear top General Electric 6L6GC. It features the same anode plate design with welded and stapled side bracing. It has extra thick mica spacers which are fixed by the extended anode plate which reduces vibrations, rattle and microphonics which is a problem with many modern 6L6GC.
Sound wise; the Groove Tube 6L6GC Re issue has the classic American vintage 6L6GC sound.

This valve is wonderfully open and transparent with a rounded and full bass sound. The valve is also really responsive to slight EQ tweaks .This is an option that is far better sounding and broadly the same price as Mesa 6L6GC STR 440 .The GT simply has more of all the good things whatever musical style or bass you play.

The full upgrade kit consists of 16 valves

3 Specially Selected Harma ECC83 Retro
1 Specially Selected and Balanced Harma ECC83 Retro
12 Specially Selected Groove Tube 6L6GC GE RI in two identical sextets

Please note that this kit is for the valves only

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