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An article that explains where we're coming from.


of these

2 watts do anything?

Survives a Train Wreck!


  S E 8 4 U F O

  2 watts per channel stereo or 6 watts mono

Hand Crafted 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  !

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

  • The Sound.
  • a signal-path featuring a mere 2 resistors and 1 capacitor.
  • Decware's highly interleaved Ultra Fidelity Output transformers
  • Class A operation
  • SET amplifier that can handle dips down to 1 ohm.
  • 7 revisions spanning 16 years.
  • Feedback from 6200 customers creates a highly evolved product.
  • Cryo-treated Jupiter Beeswax film-caps in the signal-path.
  • Point-to-point wiring with no circuit-boards in our Zen dream shop.
  • Designed by audio guru Steve Deckert.
  • a Lifetime Warranty.

If this amplifier were sold in the retail market, which it's not, the retail price would be $2495.00... but fortunately Decware sells wholesale to the public.

The further research you do into Decware and this amplifier the more you will realize that nothing sounds better for the dollar.

The Decware Zen Triode Amplifier is a single-ended-triode design using Russian 6P15P-EV or EL84 output tubes.

This amp features one output tube per channel, and both are driven by a 6N1P/6922 dual-triode input tube. 

There are only one capacitor and two resistors in the signal path of this amplifier.

The internal parts are connected point-to-point, part-lead to part-lead with almost no wire and no circuit boards.

In addition to this extreme simplicity, there is also no negative-feedback giving you unlimited sound-stage depth.

This circuit features a floating output-stage that makes it possible to bridge the amp into mono without any loss of fidelity.

There is also a volume control with additional accommodations for two sources if you choose not to use a pre-amplifier.

The design also features a self-biased output-stage which is 100% stable making bias-runaway and premature tube failures obsolete.  There are no tedious adjustments making this amplifier virtually maintenance free. 

UFO stands for Ultra Fidelity Output referring to the output transformers. These proprietary Decware transformers are made with a high degree of precision using the very best grain-oriented silicon-steel cores for a bandwidth five times wider than human hearing so that the response in the audio band becomes ruler flat.

We have successfully driven hundreds of different loudspeakers ranging in efficiency from 90 to 100 dB. On 90dB speakers, the amp works nicely in smaller rooms or for late-night out-of-body experiences.

Speakers with an efficiency of 96 dB with 1 watt will, for example, make your 2 watt Zen Triode amplifiers sound as loud as a 70 watt amplifier running conventional speakers rated at 84dB.

When these amplifiers were first released in 1998, there were
a minimal number of present day " high efficiency " speaker offerings to choose from that didn't break the bank... Fostex, Lowther, Klipsch and a few others. Today companies like Decware, Omega, Zu, Tekton, Caintuck Audio and dozen of others make speakers who fall into the desirable 94dB or higher range, and that's all you need to rock out with this Zen Triode Amp.

If you have regular hi-if speakers that you've always loved and were afraid this may not drive them - understand two things: A) It will drive them louder than you're expecting and B) you can bridge these amps into mono for three times the power.

AS OF JUNE / 2015

The SE84UFO now features a switch on each channel of the amplifier to go inbetween LO (2~6 ohms) and HI (6~16 ohms) speakers. This is a result of the UFO high-bandwidth output transformer upgrade that now comes standard in every Zen Triode Amplifier.  The switch can be operated while listening to music and it is recommended to do so as both settings will work on almost every speaker.  The correct setting is the one that sounds the best to you.

This amp is shipped with hand-selected premium quality 6P15P-EV output tubes rated at 5000 hours. These tubes have been branded "SV83" in past years.

NOTE: You can also use EL84/6BQ5's in this amplifier without adjustments of any kind. If you compare the these to the supplied 6P15P-EV’s you may find the included later to be unparalleled in speed and detail. The reason for this is because the 6P15P-EV is actually a video tube with much wider bandwidth than many audio tubes, and this gives a sense of great speed when listening to music on a Zen Triode amplifier.

We think these small output tubes are some of the best sounding and best-quality available today. Of course, with all the EL84/6BQ5 options out there, you can have a lot of fun experimenting without breaking the bank!

The input tube shipping with the amp is a 6N1P-EV. The amp is, however, also compatible with 6922 or 6DJ8 or 7DJ8. 6N1Ps have the warmest tone, 6922s have the best dynamics. 6DJ8s have the most air and micro-detail with a touch less bass. Again, a few different tubes can be a powerful tool for voicing your amplifier to your particular tastes.

The amplifier ships with a 5U4 rectifier tube. In place of the 5U4, you can use a 5AR4, 5Y3GT, and certain types of 274B .

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 an amplifier, 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 reasonable rate.

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

Tone Audio Magazine called it the Best Watts You'll Ever Buy ...  and CNET's Steve Guttenberg says:

"Trust me on this; you'd be amazed how good a few watts can sound, and when they're matched with the right speakers, micro power amps can definitely play loud enough to annoy your neighbors. You're skeptical? I don't blame you, but Decware amps are sold with a 30-day money-back guarantee, and the company wouldn't have lasted 15 years if it didn't have lots of satisfied customers. Business is so brisk there's usually a 30-day waiting list for new customers."

You may read all of the Zen Triode reviews here - going back over 15 years and customer comments like this:

"Hi Steve,

Hope all is well with you and your family?
I have been very fortunate to have picked up an Se84CKC amp over here in the UK.

Wow......I can't believe how great it all sounds.
I have owned all sorts of power amps in the past, 300b, 45, EL34 but your amp surpasses them all. I quite liked the 45 monos but they never went loud enough even though I have K-horns. No such problem with your amp however and as you quite rightly say the speed and attack is amazing out of a mere 2 watts! I agree with your opinion of the output valves, I always enjoyed the El 84's as being a very sweet sounding valve in the days when I had a Leak stereo 20 and these Russian valves are a step up......really remarkable.

I am so glad I took the chance on your products and now have a complete set and am very happy. Vinyl is my preferred medium and I am really enjoying revisiting my favorite albums. It's incredible what is stored in those grooves.

Anyway,I really appreciate Decware's philosophy and continuing efforts to provide guys like me with the chance to own top notch sound at very reasonable prices....long may it continue!
Kindest regards"


Model SE84C SE84A ,SE84B, SE84C
Manufactured from 1998 to 2008 and was retired at serial number 1000.

This unassuming little gray box (about the size of a toaster) set the benchmark for all Decware amplifiers that followed. This was the original Zen Triode Amplifier.
Manufactured from 2008 to 2009.

The chassis was stretched an inch, and the thickness of the steel chassis was doubled. Paint is changed to high-gloss black powder coat. The volume control was moved from the rear to the front. A second set of input jacks was added with a silver switch so you can run two sources.
Current model SE84C+ for 2010
Manufactured from 2009 to 2012

Binding posts were upgraded. Finish was changed to a high-gloss piano finish in white. Internally, this amplifier now uses the "CCE" mod that stands for "Christmas Comes Early" and deals with improving the operation of the output-tube suppressor grids.

Manufactured from 2013 to 2015.

Updated to a more popular 1930's black textured finish. The best sounding version to date due to a re-voiced front end. Each amp also comes standard with cryo-treated beeswax caps. We named this update the CKC mod which stands for "Christmas Keeps Coming".

Manufactured from JUNE 2015

The output transformers have been upgraded. The Decware SET output transformers have always been what set these amps apart, and now are even better with an extended frequency response.  UFO stands for Ultra-Fidelity-Output referring to the output transformers.  


This amplifier requires no adjustments or maintenance other than changing tubes every couple of years. It is a self-biasing design and self-balancing... meaning even unmatched tubes can be used without ruining the sound. 

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 
Input voltage   1.5 volts for full output
Noise / Hum   -79 dBU / -58 dBU@120HZ
Response   20 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 
Biasing   Self-Biasing
Resistors   precision WW/MF by DALE, VISHAY
Signal Cap   Cryo-Treated Beeswax Film and Foil 
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

  (pdf format).

Watch what happens when designer Steve Deckert goes to take a picture of his new SE84UFO amplifier!

(warning: some mild swearing in this video)


Wholesale price includes Lifetime Warranty


Made in USA