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Hand made in the USA and sold direct to the customer.
lifetime warranty!

"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."

This is the highly tweaked version of our original Zen Triode amplifier, originally released in 1998. Since that time it has developed an almost cult following among serious audiophiles. 

If you've done your homework, you already know the Zen Triode IS the best value in 2 watt amplifiers anywhere. It is preferred over directly heated triodes for having more speed, better micro detail, better bass, and most of all better neutrality.  It's sound stage and 3D imaging are as good as either one can get.  It sets a benchmark that's immune to price points and gold plating.

Now for the first time ever it has the two things asked for most:  Meters and optional balanced XLR inputs! 


100% Tube Amp with no solid state parts or circuit boards.  Single ended triode design.  2 watt x 2 Stereo amplifier bridgeable into mono, 6 watt x 1.  Can handle speakers with dips as low as 1 ohm with no loss of bass control.  Features a signal path with only 1 capacitor and 2 resistors.  Uses 6P15P-EB or EL84 output tubes driven by a single 6N1P-EB or 6922 input stage.  Tube rectified using 5U4G or equivalents.  Hand Built in the USA by skilled and well paid artisans, 30 day in home trial, lifetime warranty.

Preamps are optional.  Amp comes standard with two pair of RCA inputs so you can switch between two different sources.  (XLR inputs are limited to one source only)

Read the full review in this issue of Tone Audio, just click here. "For those who adhere to the 'first-watt' theory of HiFi, here’s a bonus: the Decware Zen amplifier gives you two. Yep, two watts per channel single-ended triode. i must admit they are pretty big watts, as i had no problem driving my reference GamuT s-7’s to a more than reasonable level. (The s-7’s have a rated sensitivity of 89db at 1 watt and a retail price of $42k per pair.)"

"What really sets the Zen apart from all the moderately priced tube amplification i’ve heard is its incredibly lifelike tonality and bass control."

-Jeff Dorgay, Tone Audio Magazine


This amplifier is available with different wood bases shown below.

shown in standard walnut

shown in standard black figured base

shown in optional cherry (oak and maple are also available)

shown in optional exotic zebra wood (if we can get the wood, we can build the base in any exotic)


ebony, gold, black chicken head, cream chicken head, walnut


Balanced Inputs, Stepped Attenuators, Anniversary Mods are the internal options

NOTE:  All options can be configured from within the shopping cart.

Anniversary Mods are one of these options.  There are two variations of the Anniversary mod: 1) poly bypass mod. 2) copper foil bypass mod.

The poly bypass mod is 80% as good as the copper foil bypass mod but costs around half the price.

Anniversary mods take what was already one of the highest resolution amplifiers made to an even higher resolution.  Kind of like going from really good HD movies to 4K movies.

How much of this resolution you will realize depends on the weak links in the audio chain, including your room.

These bypass mods speed up the power supply in the midrange and treble frequencies.  Not recommended for midfi CD player and cheap cables.  Amp is always the most musical and forgiving in its stock configuration.

These mods can always be added later, which is the most fun way to do it because you then get the experience of hearing what happens with something as simple as a tweak to the power supply.  Having already become familiar with your music library, you now listen to it again for the first time.  It's like attending the same venue but setting in a different seat.  A better seat.

The output channels are self biasing so meters have been provided to show you if you tubes match.  They also show you how strong your tubes are, as well as when or if the amp is clipping.


Well, some would say "it's the real deal...  not mass produced. Hand-built, point-to-point wired using only part leads to limit the solder nodes. Only 2 resistors and 1 capacitor are in the signal path. Uses our UFO proprietary output transformers in a high mass steel chassis of the highest quality - all built by skilled artists here at DECWARE in the USA.

The 6P15P-EV output tubes are among the most linear in the world when triode wired.* We think that this tube is the most neutral sounding. And then there is owner of Decware, Steve Deckert's flawless Zen design that separates this amp from other high quality boutique competitors.

There's been so many 300B and 2A3 amplifier owners that have switched to the Zen Triode that we've lost count. We bring that up because most people who haven't heard one can't wrap their head around the concept that an amplifier at this price could sound this good - but the Zen amp does. 

* SV83/6P15P-EB Data Sheet.

Optional Transformer Balanced XLR Inputs are available as an option on this amplifier when run in stereo.

Top Quality Gold / Teflon input jacks and fused IEC connectors are provided for use with hi-end cables. The amp is self biasing so you never need to adjust the bias and the bias will never drift out of adjustment. We ship it with the long life military grade version of the SV83 called a 6P15P-EV featuring Gold plated Grids from Russia.

These amps are built in the dedicated assembly space shown above.


Worried about 2 watts being enough power? Bridge the amps into mono and quadruple your power!

The SE84UFO amplifiers employ a unique floating output transformer scheme where the negative speaker wire is not tied to chassis ground. That means when the amp is bridged, both channels may either be series or parallel wired. In series, both channels work as one and transparency is preserved.  

So with no sonic drawbacks to running the amps in mono, you can expect 6 dB of additional power rather then the expected 3dB. This is thanks to the power increase the amp has when it sees half the speaker load from being series bridged.

And if you are a fan of fully balanced rigs, you'll be pleased to know that because of this output design it is also possible to run a pair of these amps as fully differential balanced monoblocks. All you need is our custom cable set to go between the amps and your XLR cables.


We have successfully driven hundreds of different loudspeakers ranging in efficiency from 90 to 100dB 1w/1m. On 90dB speakers it works nicely in smaller rooms or for late night out of body experiences at closer distances. 94 to 96 dB speakers are almost ideal in that they let you play beyond a normal listening level and preserving the dynamic headroom in even larger rooms. When these amplifiers were first released in 1997 there were a minimal number of "high efficiency" speakers to choose from. Today that is no longer the case - they are everywhere. We also offer several different types of loudspeakers that will work with this amp.

If you own speakers that you love and are afraid this may not drive them understand two things: A) It will drive them louder then you're expecting and B) you can bridge these amps into mono blocks.  Because of the power increase into lower ohms, you will net 6dB of additional power. Same thing as doubling your power... twice.


The SuperZen SE84UFO2 now features a toggle switch to select lo and hi impedance speakers as a result of the UFO high bandwidth transformers now standard on every Zen Triode Amplifier. 

LO = 2 to 6 ohms  HI = 6 to 16 ohms


This amp is shipped with premium quality N.O.S. 6P15P-EV output tubes with gold grids rated at over 5000 hours. These Russian military spec tubes are the top grade of what we came to know in this country for a brief spell as the SV83. You can also use EL84 tubes in this amp.

You'll find the 6P15P-EV to be unparalleled in speed and detail - in part because it is a video tube with much wider bandwidth than a normal audio tube. When used for audio we think these tubes are one of the best sounding most transparent available today. The EL84 (6BQ5) is a bit warmer / slower sounding giving the amp a different signature by just switching output tubes.

The input tube is a single 6N1P, 6922 or 6DJ8 - your choice. 6N1P's have the warmest tone, 6922's have the best dynamics, 6DJ8's can have more air and micro-detail with a touch less bass. Again, a powerful tool for voicing your amplifier to your particular tastes.

The rectifier location is compatible with 5U4G, 5AR4, 5Y3GT, and some 274B.


This amplifier has been used by cable manufacturers as a tool for evaluating the differences in wire and cable designs.  It has also been used by capacitor manufactures as a tool to hear what the caps sound like during development.


This amplifier is hand built in the USA by DECWARE / High Fidelity Engineering Co. It comes with a lifetime warranty to the original owner. If you purchase one second hand and ever have questions or technical problems we WILL be happy to check it out for you and service it if needed for a very reasonable rate.

We also have a support forum with many people who own this amplifier who's experiences you may benefit from.


You may read reviews on this amp going back to 1998


This amplifier requires no adjustments or maintenance other than changing tubes every couple years. It is a self biasing design and self balancing meaning even unmatched tubes become matched when installed.  The SV83 (6P15P-EV) or EL84 output tubes wired in triode were chosen over 300B, 2A3, 45, and other triodes for having the best sound and imaging.

Weight   17 lbs. ea.
Dimensions   8.0" H x 6.125" W x 12.0" D
Circuit type   Single ended Class A Triode
Power output   2.3 watts RMS into 8 ohms / stable into 2 ohms
    5 watts RMS into 8 ohms bridged
Input voltage   1.2 volts for full output
Noise / Hum   Noise -80 dBU  Hum - 64 dBU
Response   10 Hz ~ 80 kHz 
Feedback   ZERO negative feedback used
Rectification   5U4G / tube rectification
Output tubes   SV83 or EL84/6BQ5
Signal tube   6N1P or 6922 or 6Dj8
Transformers   Decware UFO
Biasing   Dual cathode bias with current meters on each channel
Resistors   precision WW/MF by DALE, VISHAY
Signal Cap   Copper Foil MiFlex
AC cord   Removable power cord
Consumption   65 watts at full power
Input jacks   RCA type 24K Gold / Teflon x 2 for 2 sources.  (Optional balanced XLR one source only.  You can have 1 RCA and 1 XLR source at the same time select-able with the front input switch.)
Output jacks   5-way binding posts accept 10 gauge
Speaker dB/1w   89 dB minimum / 96 dB is ideal
Warranty   Lifetime to original owner

for this amplifier (pdf format).


Steve's papers for audiophiles

JUNE 2015

To celebrate our 20th year making the Zen Triode Amplifiers, we are now offering Ultra Fidelity Output silver leaded high interleave transformer with response that is +/- 1dB out to 80kHz! 

We offer this amp with a 30 day money back trial
so you can hear one in your own room!

Available in 110/120 volts  or  220/230/240 volts.

   2 watts x 2 or 6 watts x 1

Hand made in the USA and sold Factory Direct with a
L i f e t i m e   W a r r a n t y  !



Use coupon code: ROBINSON to get your amp for $1295.00