Mesa Boogie Pre Amp Kits / Mesa Prodigy Four 88 Harma STR Standard Gain Pre Amp Kit

Mesa Prodigy Four 88 Harma STR Standard Gain Pre Amp Kit Mesa Prodigy Four 88 Harma STR Standard Gain Pre Amp Kit Click on image(s) above to view larger

All prices contained on this page are exclusive of VAT. This is currently charged at 20% and is payable by the UK only.

This Harma ECC83 STR preamp revalve kit is designed to give your Mesa bass amp the maximum clarity and bass note definition with a large and clear sound with a deep bottom end thump.

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



Facebook Twitter Follow us on Instagram