Ampeg Pre Amp Kits / Ampeg SVT VR Harma 7025 Preamp Upgrade Kit

Ampeg SVT VR Harma 7025 Preamp Upgrade Kit Ampeg SVT VR Harma 7025 Preamp Upgrade 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.

These Ampeg pre amp revalve kits are put together to provide a sonic upgrade over the stock valves in your Ampeg. I own and have played over the past 30 years Ampeg SVT, Original V4B and for recording the B15-N portaflex. I have also used many of the Ampeg valve pre amps.So these kits use the best of New Old Stock valves and modern day production items to give you the best sound out of these lengendary bass amps.
Ampeg SVT Vintage Reissue Pre amp kit is designed to give your Vintage Reissue head a clean sound but when run with a fair amount of input gain will give a little valve distortion that will recreate the edge of the original valve vintage SVT.

This set will suit the player who wants to get more of a vintage throaty ampeg valve sound with plenty of punch with aggressive highs.

The Harma 7025 STR DR 250 is a high gain valve selected for bass amps and it will distort evenly and sound crunchy and it removes the mush and fizz of the standard Chinese 12AX7-C. The Harma 7025 therefore offers better performance with this regard. The valve is very well balanced with nice even bass which has plenty of depth with the top end being more aggressive and hard.

The Harma ECC82 STR has a very clear bass response, which is both tight and musical. The sound is well balanced and good even detail across the audio spectrum with a clear and smooth treble.

The Harma STR set is best suited to bass player that wants a cleaner punchier sound. This set gives the most neutral and balanced sound and therefore gives the player the greatest versatility to shape the Ampegs tone.

The valve when used in conjunction with the extensive tonal shaping of the Vintage reissue head can be used to get the full range of vintage punky Precision bass type clank to a more modern rounded bass sound with a harder edge.

The kit consist of 8 valves

4 Specially selected Harma 7025 STR DR250
4 Specially selected Harma ECC82 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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