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Welcome to Decware


Zen Triode Mono Amplifiers

2.3 watts of pure bliss


Model SE84UFO3

The Zen Triode  Mono Amplifiers


This is our famous 2 watt Zen Triode stereo amplifier split in half!  If you're not familiar with our 2 watt amplifiers you can find one here.

It is important to understand that our 2 watt stereo amplifiers can be bridged into mono for double or sometimes triple the power depending on the speaker load.  So a pair of our 2 watt stereo amplifiers bridged is going to be 4 to 6 watts per channel whereas these amps will put out only 2.7 watts per channel. 

Why make them?

These are made for people that don't need more than 2 watts per channel and are looking for that extra bit of performance that comes with dual power supplies.  Additionally there is tube regulation (OA3) in each amplifier that makes an audible improvement in the sound.  This feature is not available on the regular 2 watt amplifiers until you get to the anniversary version (SE84UFO25).

There are anniversary mods available for these mono amplifiers as well, but unlike anniversary mods for our other amps which push them closer to the performance of our SE84UFO25, anniversary mods in these amps actually exceed the performance. 



  • 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 - 2.7 watts  RMS into 4 or 8 ohms

  • Stable into 1 ohm speaker loads

  • Input voltage - 2.0 volts for full output

  • Noise / Hum - Less   than 1.0 millivolts 

  • Response - 20 Hz ~ 80 kHz

  • Feedback - ZERO negative feedback used

  • Rectification - 5U4G or 5AR4 or 5Y3GT/ tube rectification

  • Output tubes - SV83 or EL84/6BQ5

  • Signal tube - 6N1P or the following alternates: 6922, 6Dj8, 6N23P,6H1N,6N5P

  • Transformers - Decware UFO wide bandwidth Ultra Fidelity Outputs

  • Biasing - Self-Biasing

  • Resistors - precision WW/MF by DALE, VISHAY

  • Signal Cap - Foil caps

  • AC cord - Removable power cord

  • Consumption - 65 watts at full power

  • Input jacks - RCA type 24K Gold / Silver

  • Output jacks - 5-way binding posts accept 10 gauge

  • Speaker dB 1w/1m - 89 dB minimum / 94 dB or higher is ideal for most rooms

  • Warranty Lifetime to original owner


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.

We also have new in 2024, solid hardwood victorian style bases available in the shopping cart.



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

Anniversary Mods

Anniversary mods in the case of this amplifier bring the performance to a level equal to our top model SE84UFO25's. 


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


2.7 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.   


Zen Triode Mono Amplifiers

2.7 watts of pure bliss


Listen to a pair and find out what UFO really means...

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