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Welcome to Decware


Select Zen Triode Amplifier

2.3 watts of pure bliss


Model SE84UFO2.1

The Zen Triode Amplifier

S E L E C T  V E R S I O N

Video Review of the SE84UFO2 Amp

We have since upgraded to model SE84UFO2.1 

"If you haven't heard a Zen Triode Amplifier... you're in for a really pleasant experience!  It floats music in 3D space like very few amplifiers can.  Designed and built in the USA it comes with no disappointments.  It's the 2.3 watt Single-Ended Triode amp that has set the standard since 1998 and has been sold wholesale to the public the entire time!"

What sets this amplifier apart?

  • The Sound - it's what we all chase.

  • Bass performance.

  • No circuit boards or solid state parts.

  • A signal-path featuring 2 resistors and 1 capacitor.

  • Decware's highly interleaved Ultra Fidelity Output transformers. 

  • Class A SET operation that can drive loads below 2 ohms. 

  • 8 revisions spanning 24 years. 

  • Feedback from many 1000's of customers creates a highly evolved product.

  • Exotic internals.

  • Point-to-point wiring

  • Zero negative feedback.

  • Designed by audio guru Steve Deckert.

  • Parts and Labor from the USA.

  • A Lifetime Warranty.


This is a pure class A single-ended triode amplifier with 2 high-current watts per channel and the ability to drive speakers between 2 and 16 ohms.  It features a volume control and two pair of input jacks making preamps completely optional. Also it can be bridged into mono for around 6 watts. Because of our floating output stage design, a pair of these amps can even be run as fully differential balanced mono blocks.

The amp is based on one triode-wired EL84 per channel driven by a single 6922 and features 5U4 tube rectification.  That said we use a superior variant of the EL84 called a 6P15P-EV from Russia.   An extremely special tube with gold grids and super wide bandwidth giving a more transparent and neutral sound.  From the same factories we use a Russian variant of the 6922 called the 6N1P-EV.  This is a warmer and nearly bullet-proof tube that exemplifies the term 'liquidity'.


The amplifier is cathode biased for best sound and to ensure that the tube bias is always right... not to be confused with 'auto-bias' which attempts to maintain the bias using solid state parts.

Decware amplifiers, including this model shown above, are all point-to-point wired without circuit boards and are laid out in such a way that the part leads themselves create the circuit.  This creates minimal wire and minimal solder nodes.  Also there are no solid state parts in this amplifier. Not even an LED to potentially poison the signature.  The power supply is a brute force design meaning it is sized 300% larger than required so that even at full power output there is zero sag. With no need to regulate there is no possibility of artifacts from the regulation.

In summary, if I were building and amplifier for myself... this is how I would do it when there are no concerns about the profitability of mass production, and you just want the very best possible sound.  The happy side effect of this approach is the things last forever, which is why we can offer a lifetime warranty.


Steve Deckert / DECWARE


You may choose from several kinds of wood base for your amplifier.


These choices are selected in the shopping cart. 

Contemporary Walnut is the standard with no additional cost;


Special woods carry a small up charge.  Custom cost more.

Contemporary Cherry, Contemporary Maple, Contemporary Oak, Contemporary Black, and Contemporary Custom.

Custom bases can be almost any wood with almost any finish.  The amplifier shown at the top of this page is in a contemporary black piano finished base.



Knob types: ebony, gold, black chicken head, cream chicken head, rosewood


Anniversary Mods

Anniversary mods were developed to take this amplifier a step closer to our top model SE84UFO25's resolution.  These mods enhance speed / resolution to its maximum musical potential.  There are both level 1 and level 2 anniversary mods.  The difference is the type of capacitors used in the mods.  Level 1 uses film caps while level 2 uses foil caps to match the foil caps in the signal path. 


GOOD NEWS - This amplifier comes with level 1 anniversary mods standard at no extra cost.  Level 1 is 80% the same effect as level 2 so we included it at no extra charge.  If you want to upgrade to level 2, you can select it in the shopping cart. 

The wood type, knobs and other options can all be configured from within the shopping cart when you check out.


Weight 17 lbs. ea.

Dimensions 8.0" H x 8" W x 16.0" D

Circuit type Single-ended Class A Triode

Power output 2.3 watts  RMS x 2 or 6 watts RMS x 1

Input voltage 1.5 volts for full output

Noise / Hum -79 dBU / -54 dBU@120HZ

Flat Response 10 Hz ~ 80 kHz

Feedback ZERO 

Rectification 5U4G / tube rectification

Output tubes SV83/6P15P-EV or EL84/6BQ5

Signal tube 6N1P or 6922 or 6Dj8 

Transformers Decware UFO wide bandwidth 

Biasing Self-Biasing / Cathode Biased

Resistors precision WW/MF by DALE, VISHAY 

AC cord Removable power cord

Consumption 65 watts 

Input jacks RCA type Gold / Teflon

Output jacks 5-way binding posts accept 12 gauge

Speaker dB/1w 89 dB minimum / 94 dB or higher is ideal

Warranty Lifetime to original owner


Since we don't have dealer's and we sell our amplifiers directly to the customer, our customers have a direct line to us.  As a result, Decware support is legendary for over 20 years.

Support is not only a phone call or email away at any time, but when you purchase this amplifier you join a huge family of customers who also own one and enjoy supporting each other on the:




Manual is in a .pdf format


2.3 WATTS x 2  or  6 WATTS x 1

Made by hand in the USA and sold wholesale to the public with a 
L i f e t i m e   W a r r a n t y  !

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Amps are hand-built to order.  There are presently lots of orders on our real time build sheet.   A 10% deposit secures your place on the list with today's date and time stamp.  Balance is due when it's ready to ship. You will be sent a final invoice with the total price including actual shipping costs by our office during your wait.   


Video Review of the SE84UFO2 Amp

The Select Zen Triode Amplifier

2.3 watts of pure bliss


Listen to one and find out what UFO really means...

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