Marshall Amp Full Revalve Kits / Marshall VBA 400 Classic JJ Tesla 6550 Full Upgrade Kit

Marshall VBA 400 Classic JJ Tesla 6550 Full Upgrade Kit Marshall VBA 400 Classic JJ Tesla 6550 Full Upgrade Kit Click on image(s) above to view larger

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Marshall amplifiers are voice of Rock and Roll past, present and in future.These amplifiers have been used by all the music legends. From Clapton's fierce bluesbreaker solos with John Mayall, to the powerhouse slam of Jimmy Page in Led Zeppelin to Steve Jones awesome sound with his JCM800. These Kits are designed and put together to enable you to get the best out of your particular amplifier. Our Classic kits are aimed at giving you the closest to the original Mullard/Marshall sound that has rocked the music world
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The Marshall VBA 400 Classic JJ Tesla full revalve kit is specially selected for Marshall VBA 400 bass amplifier.

The Marshall VBA 400 has a very simple yet very effective pre amp which makes available the classic late 60's early 70's Marshall super bass sound right thought to more modern voiced bass sounds. So in order to get the best sound out of this amplifier we use a combination of the best of the current production and new old stock items to achieve this.

In the Pre amp section we use the following,

The Harma ECC83 Retro provides a harmonically rich and detailed sound with excellent 3 dimension midrange response. This valve has a traditional British voiced with the outstanding feature of its smooth linear midrange response and extended frequency response so you get smooth warm midrange, excellent clarity and tight fat punchy lows. This captures that classic vintage Marshall Bass sound better than all the other ECC83/12AX7 that I have tried.

In the ECC82/12AU7 we use the new old stock Philips ECC82/5814A for very good reason. The Philips Jan Military

ECC82/5814A is used as it is a special military grade valve that was with the highest grade materials and with no compromise on selection or quality control as they were for the American Government to be used in avionics.

These valves have a number of unique features such as high grade filament isolation so even after long periods of use the filament will not degrade. The 5814A were designed to be immune to shock and vibration as they were designed for military aircraft. This is important in the Marshall VBA400 as filament rattle is a problem with many modern ECC82 types which do not seem to last the course.

In the output section we use the following,

The Marshall VBA 400 takes a total of 8 6550 valves in the output stage and therefore there is unfortunately no cheap shortcut when it is time for a revalve of this monster of an amp. The JJ 6550 does provide excellent performance at a lower price point.

The JJ 6550 has proved an excellent valve for all applications. In my Marshall VBA400 bass amplifier the JJ 6550 has provided me with consistent and reliable performance. The JJ 6550 has a very lively punchy sound which will recreate all the modern bass sounds and also works very well on 5 string bass due to its excellent bass clarity. The low end bass response is very tight with plenty of depth and lots of clarity. So this valve will produce all the vintage rock bass sounds with ease. The JJ is also very well constructed with large anode plates and thick grade glass. The Marshall puts out a lot of low end and these 6550 did not show any mechanical rattles after extensive gigging, so can be fully recommended.

The set consists of 12 valves

3 Specially Gain selected Harma ECC83 Retro in V1, V2, & V4
1 Specially Gain selected Philips ECC82/5814A in V3
8 Selected and matched 6550 JJ Tesla in a matched Octet.

Please note that this kit for the valves only



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