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THE PREAMP – full tube / high voltage bass and guitar preamp


A small classic tube preamp based on a very famous bass preamp (preamp that was inspired by the Fender Dual Showman), with some added features:

– separate gain and volume controls will enable you to enter in the overdrive domain, so you can keep a decent output volume and get that pumped tone.
– high-voltage FET buffer (optional)

The preamp uses an internal SMPS module for the High-Voltage and will need a 12V DC @ 1A wall-wart (provided with the preamp).


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3 reviews for THE PREAMP – full tube / high voltage bass and guitar preamp

  1. Mark Avnet
    Really, really great! I ordered a prebuilt box, which was sent out instantly; took a bit of time to get to the US, but arrived well packed and intact. And it sounds amazing. Clean, quiet, tubey – the tone stack is definitely the F2B stack, and the interplay between the gain and volume knobs brings something missing from the Alembic original – easy overdrive that still keeps that warm sound. Between this and a small class D power amp, other than speakers my entire rig fits into my bass gig bag. I’m very happy with this preamp!

  2. Jonathan Chen
    Dexter built a F2B Preamp “in a box” form me. It has worked amazingly well. For live gigs, I use an original vintage Alembic F2B preamp to get that clean Peter Hook sound for my bass. Now with Dexter’s F2B Preamp stomp box, I am able to create the same sound without having to lug around my rack case. The sound is just as amazing as the original Alembic. Quality of construction is excellent. Highly recommend Dexter. In fact, I’ve asked Dexter to start another project for me — a preamp circuit board for the Yamaha BB1200S bass guitar.

  3. Felix Hubert
    I have one of these and i am really in love!
    I play a Markbass LM3 as a portable amp solution, which is quite okay, but nothing special. The Preamp gives my basstone an intimate note and exactly these overtone frequencies i need to cut trough the mix without getting annoying.
    I do not use the Preamp with a hard scoop, like Fender Tone Stack suggested (like it would be when all knobs are at 12am), i turn the mid knob to the right and the bass and the treble to the left, exactly like on the photo. So i get a wonderful rich tone which is still a killer slap sound, but also a warm blues or fingerfunk sound.
    As a result of these possibilities of sound without calibrating my amp while the gig (the sound comes now only from my fingers), i am less nervous or stressed and focused more to the music!

    The master knob is an absolute necessary feature, the preamp has so much volume at the output. What i really mean is, there is absolutely no problem driving any poweramp.

    Thank you so much Gabriel, for your friendly support but also for your more then fair price. I would always buy it again

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