Single-Ended EL84 Stereo Tube Amplifier Kit

Your gateway to custom tube audio can't be any easier. 


The Exordium is a new DIY kit for builders looking to get started with a great sounding tube amplifier in a compact and sleek physical design.

Everything you need for quality sound in a compact size.

The Exordium includes components carefully selected so that you will have a great sounding tube amplifier at a reasonable size and cost. Operating up to 4 watts per channel, it is not a powerful amplifier, so it is recommended for smaller listening spaces and speakers that have high sensitivity. If you are looking for an entry point to tube audio without spending a lot but also not compromising on quality, this is the kit for you.

Speaker Impedance:  8 ohms

Output power:  4 watts per channel

Total Harmonic Distortion (THD):  1.8% at 1 W (1 kHz)

Frequency Response:  50Hz - 20kHz (<1 dB)

Input sensitivity:  825 mV

Additional circuit and component details:  The Exordium is a single-ended design using a 12AT7 dual-triode driver tube and EL84 (6BQ5) output tubes. It is wired to run in ultralinear mode for the best balance between power and distortion, but can easily be modified to run triode-strapped. It includes a Hammond power transformer (made in Canada), EdCor output transformers (made in USA), and JJ Electronic tubes (made in Slovakia). The chassis is hardwood and aluminum, hand crafted and finished in the USA.


Instructions written and illustrated for humans.

You will not just build, you'll learn.

With an electronics kit, you should never have to settle for a frustrating experience trying to interpret poorly-written instructions and hoping that all the parts are going together correctly. The Exordium has extensive step-by-step instructions, illustrations, schematic and layout diagrams. Even more, it includes an entire circuit explanation so that you are empowered to truly understand how your amplifier works, and explore future designs of your own. You don't need anything other than a few tools including a soldering iron, and you do not need to know how to read a schematic.



Customer from Georgia


Fired up and ran clean first time plugging it in, good instructions and good sound.

Get started today.