Mesa Boogie Full Revalve Kits / Mesa Single Rectifier Harma STR 5881 Full Upgrade Kit

Mesa Single Rectifier Harma STR 5881 Full Upgrade Kit Mesa Single Rectifier Harma STR 5881 Full Upgrade Kit Click on image(s) above to view larger

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A test report is available click here to view

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.
This full revalve kit consists of a Standard gain pre amp kit combined with the Harma 5881 output valves. This kit is for the Mesa Single rectifier range of amplifiers with 6L6GC fitted.

It is designed to give your Mesa Single rectifier more clarity, smooth warm overdrive with tight fat punchy lows.

The Harma ECC83 STR is used as it has a number of advantages over other 12AX7 types such as reduced microphonics and better isolation from vibration. This is particularly useful in combo applications. The valve is very well balanced with nice even bass which has plenty of depth. The mid-range is clean and transparent which removes the mush and fizz that happens when Boogies are overdriven.

The Harma 5881 is the original Military grade button based item that Mesa used as the STR-425.This valve is one of the most reliable 6L6 types ever built with decades of use in Military applications.

This valve removes the midrange mushiness and flabby bass associated with the Chinese made STR-440. If you scoop out the mids then this is an ideal choice as this valve does not go thin and tinny like some 6L6GC. The Harma 5881 produces a well-balanced thick sound that is ideal for Metal, Hard rock and fusion styles.

The kit consists of 7 valves.

4 Specially Selected Harma ECC83 STR for position V1 to V4.
1 Specially Selected & Balanced Harma ECC83 STR for V5,
2 Specially Selected Harma 5881/6L6 Military spec output valves

Please note that this kit is for the valves only



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