Mesa Boogie Cryo Full Revalve Kits / Mesa Bass 400+ 5881 Cryo Full Revalve Kit

Mesa Bass 400+ 5881 Cryo Full Revalve Kit Click on image(s) above to view larger
£404.00
£363.60

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Our Mesa Boogie specially selected Cryo full revalve kits are designed to enable you to get the best sound out of your Mesa Boogie amplifier. These sets consist of specially position selected Cryo treated pre amp valves that have been selected for each position of your Mesa amplifier. In the output stage we use specially cryogenically treated valves that have been selected to work with the Mesa boogies fixed bias arrangement. Certain output valves will be better for certain kinds of music and therefore to make your choice easier we have indicated this in our product description. Mesa Boogie amps have pioneered the way in multi channel high gain amplifiers and with these cryogenically treated valves sets this will take your sound to a new level.
10% Discount


This Cryo full revalve kit consists of a standard gain pre amp kit combined with the Harma 5881 Cryo output valves.
This kit is for the Mesa 400 plus bass Head and is a special Cryo set for owners who want upgraded performance and clarity without taking out a second mortgage and offers an upgrade over the stock Chinese 6L6GC STR 440.

In the Pre amp Section;

The Harma ECC83 STR Cryo is used as it has a number of advantages over other 12AX7 types such as reduced microphonics and better isolation from vibration. The valve is very well balanced with nice even bass which has plenty of depth. The cryo treatment enhances the high end treble giving a smooth linear response. The treatment gives the valve an extended frequency response so you get smooth warm and punchy midrange with excellent clarity and tight fat punchy lows.

In the output section;

The Harma 5881-Cryo is the button based Russian military valve that is the same valve which powered the Mesa Boogie amps (STR 425) in the late eighties. This valve has bullet proof reliability and proven track record over decades of use in Russian military applications. This valve was designed to withstand 3G as it was used in the servo motors of Russian fighter Jets. The valves are made with high quality military grade plate material for extended life in the most serve working conditions. Therefore have a reputation which is second to none in terms of clarity and reliability. These valves are of a much higher specification than current manufactured 5881 and each of these valves also has the Russian government stamp of approval for military applications.

So as I own several Mesa 400 plus bass heads I fully understand the pain involved in revalving this classic bass amp and maintaining your sound without the need for a second mortgage.

The 5881-Cryo enhances the sound in a number of ways over the standard 5881 valve. The treble response has much more clarity and detail with more percussive attack. The valve also has a clearer midrange with a tighter more fluid bass response. The valve overall has more dynamics and a more musical response. In my own Boogie 400 plus subtle changes in Eq or enhancing certain frequencies with the graphic was far more noticeable with the 5881 Cryo. What the cryo treatment does to this valve is remove the haze that hampers the sound of the standard item. This transforms a valve known for it legendary reliability in to a valve that now sonically can compete with the best.

We have therefore matched special sets of 12 of these 5881-Cryo with identical current draw and output gain. They have also been tested for hum and microphonics all within the parameters of our own Boogie 400 plus.

The kit consists of 16 valves.

3 Specially Selected Harma ECC83 STR Cryo for position V1,V2 & V4.

1 Specially Selected & Balanced Harma ECC83 STR Cryo for V3,

12 Specially Selected Harma 5881/6L6 Cryo Military grade in a two identical sextets



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