Mesa Boogie Pre Amp Kits / Mesa Bass 400+ Harma STR Standard Gain Pre Amp Kit

Mesa Bass 400+ Harma STR Standard Gain Pre Amp Kit Click on image(s) above to view larger

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This Harma ECC83 STR preamp revalve kit consists of a Standard gain Pre amp kit and is designed to give your Mesa a tight clear well defined sound with a clean transparent top end and punchy lows.

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 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 bass guitar applications. The valve is very well balanced with nice even bass which has plenty of depth. The mid-range is clean and transparent and has a nice rounded tone.
When overdriven this valve has a warm and fat sound which is rich in harmonics and is extremely lively and expressive.

The kit consists of 4 valves.

3 Specially Selected Harma ECC83 STR for positions V1, V2 & V4.
1 Specially Selected & Balanced Harma ECC83 STR for V3,



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