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Mesa Boogie Pre Amp Kits / Mesa Buster Bass Harma STR Standard Gain Pre Amp Kit
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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.
A test report is available click here to view
All prices contained on this page are exclusive of VAT. This is currently charged at 20% and is payable by the UK only.
A test report is available click here to view
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. It has a very well balanced tone with nice even solid bass. The mid-range is clean and transparent with plenty of high end chime and extended upper range harmonics. This midrange response is important as it shows the difference when changing pickup selection or using different basses. This nice tonal variation is lost in some other Pre amp valves.
The kit consists of 3 valves
2 Specially Selected Harma ECC83 STR
1 Specially Selected & Balanced Harma ECC83 STR
Please note that this kit is for the valves only
All Harma preamp valves are Dynamically Drive tested under real working condition have passed the following tests:
Gain (db) Drive Tested)
Transconductance (gm) Drive Tested
Output Drive Tested
Noise 1 (signal to noise)
Noise 2 (Aural)
Microphonics Test 1(Ambient)
Microphonic Test 2 (Shock)
Cathode Test
Grid Leakage Test
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