MapSpinner Page

All DECWARE products are made in the USA



Read Steve's
on these amplifiers in the articles section

Read the White Papers to find out how they work!

for these



of these
fine amplifiers

by appointment at


 join our forums and
ask who's in your area with Decware gear. 

actually do anything worthwhile?



An article that explains where we're coming from.



Zen Triode Integrated

  6 watts x 2 or 12 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  !

"Exploiting the magic of the beloved EL34 / 6CA7 output tube as only Decware can!"

If you love S.E.T. amplifiers, then you know why you're here...  If you're new to the Single-Ended Triode (S.E.T.) concept, here's your chance to get it right the first time !

In it's 12th year of production,
this 6 watt per channel S.E.T. amplifiers popularity has withstood the test of time. It has been upgraded 3 times over the years with subtle improvements, but this time the change is big! 

For the first time since it's release this wonderful amp is bridgeable into mono using the Decware Series Floating Output Bridge that eliminates the typical smear you get when you combine the channels of stereo amplifiers.

Also for the first time in this amp there are meters that turn your amplifier into a real time tube tester for each output tube! This lets you see at a glance if your tubes match and how strong they are.

Similar to the 2 watt amplifier that started Decware, this amplifier is designed with the purist in mind. It has only 1 capacitor in the signal path. There is no feedback of any kind giving it a heavy dose of the completely 3D imaging that Decware amplifiers are known for. This small SET amplifier breaks stereotypes with great bass and a very extended top end!

The SE34I.5 is an easy amplifier to own because there is no maintenance and no bias pots to adjust. Tubes last a long time in this amplifier - typically several years. In the SE34I.5 chassis, there are no vent holes to let dirt and dust contaminate the inside.  There are no circuit boards to crack or burn up, and we've got your back with a lifetime warranty.

You will simply turn it on and enjoy the music, every time. 

All options can be selected from within the shopping cart.

This amplifier features a chassis design using interchangeable solid wood bases and different knobs. Some samples are shown below.

Top to Bottom: Maple, Cherry, Black, Walnut, Black Figured/Molded.

Left to Right: Ebony, Gold, Black Chicken head, Cream Chicken head, Walnut.

These and Other options can be selected

  (Screen shot from the shopping cart.)



For people on a tight budget who already own premium grade tubes there is the option to waive the 30 day trial and ship the amplifier without the tested factory tube compliment.


A 6N2P is a higher gain input tube that's kind of fun to have since it will sound completely different than the stock 6N1P/6922 compliment.  When the option is selected, you get both the stock 6N1P and a 6N2P for each channel.


You can configure your amplifier with one, two, or four pair of inputs for up to 4 sources.



We build our amps with USA made Gold/Teflon RCA jacks shown above, however we do offer an optional machined Silver RCA jack for a slight up charge.


You may optionally add variable line level outputs, one for each channel. These outputs can be used to driver a second amp (bi-amping) or send a signal to a sub-woofer. The signal coming from these outputs will match the signature of the amplifier right down to the tubes you've selected. That means you could run this amp on mids and highs and a "slave" amp on the bass.  The secondary or "slave" amp would then takes on the signature of the tube amp for a more coherent overall blend.


The amplifier comes standard with Cryo-Treated High Temperature Beeswax Capacitors with silver plated leads from the USA company called Jupiter Condenser. Alternately we have a type II Beeswax capacitor that uses copper foil that is claimed to be a notch better.


Single or Dual ?  We offer the amplifier with your choice of a single volume control that operates both channels or dual volume controls.  Dual volume controls make it possible to adjust balance, whereas single volume control does not.

We also offer a 20 step 1% precision metal film attenuator with gold contacts as an optional replacement for the stock volume controls. Just realize that there is a big difference between having a smooth volume control with infinitely small adjustment and a attenuator with 20 large steps from zero to max.  Even though the attenuator is claimed to be more transparent in the lower ranges of volume, you have to weigh the trade-offs yourself.  Designer of the amp, Steve Deckert typically prefers the infinite adjustability of standard volume controls and one for each channel.


We can install a custom headphone jack suitable to run planar or dynamic headphones although placement of the jack will depend on what options are installed.  The headphone jack option is non-refundable.

Shown with 807 output tubes (click image for larger picture)

The SE34I.5 is a very stable amplifier capable of driving all high efficiency loudspeakers because of it's transformer-coupled output stage. This creates a hand-shake between the amplifier and the loudspeaker and protects the speaker from DC voltages should a tube ever fail. Of course most tube amplifiers use output transformers, which tend to be the most expensive single components in the amp. This is where many tube amplifiers fall short opting to to impress you with low grade steel transformers that have to be twice as large to achieve the same bandwidth... all you know is they have really big transformers so you can see the marking in that. The more power the average tube amp has, the more likely it is to use moderate quality transformers - at best. 

Decware transformers were designed and are built specifically and only for THIS amplifier here in the USA. They use the highest quality grain-oriented silicon steel laminated cores with exhaustive interleaving to produce the most phase coherent wide bandwidth sound possible. Our transformers have always been proprietary and are a big part of the secret behind the Decware sound. 

On August of 2015 we took our already great output transformers to the next level developing what is known as the UFO (Ultra Fidelity Output) output transformers which are included at no extra cost.  These new models are capable of bandwidths reaching nearly 100kHz and have adjustable HI/LO speaker impedance switches for each channel!  LO = 2 to 6 ohms, HI = 6 to 16 ohms.


This amplifier is optionally available with our World Voltage Compatible Transformers. If you live outside the USA, your amp will be automatically wired and tested for the correct voltage of your country.


This amp uses a pair of 6N1P's driving a pair of EL34 output tubes. You can use 6N2P's, 6DJ8's, 7DJ8's or 6922's in place of the 6N1P's.

EL34 Output tubes may be substituted with the following: KT77, 6550 KT66 KT88 6L6's, 7027 and with a socket adapter, 807.   .  Because this amp has the Hazen Grid Mod that activates only when EL34's are used, we ship the amp with top grade EL34/6CA7 that have been fully tested IN the amplifier. All tubes come with a 90 day warranty.


This amplifier is self biasing so you NEVER have to set or adjust the bias for the output tubes.


Compatible loudspeakers should be at least 90 dB efficiency.

On 90dB speakers it works nicely in smaller rooms or for late night out of body experiences. 94 to 96 dB speakers are ideal in that they let you play beyond a normal listening level and preserve more dynamic headroom. 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) Most people report that it drove their speakers louder than they were expecting and

B) a good tube preamp can really turn this amp on giving you more volume before clipping.


This amplifier is very transparent. Differences between cables will become much easier to hear. If you don't have good interconnects or speaker cables or just you're just not sure how good yours are... we offer reference quality cables that will let you hear the amplifier's full potential. It is important to us that you hear what your new amp is capable of so we provide the same cables Steve Deckert, the designer, uses in his own personal system.


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 12 years.



Manufactured from 2000 to 2004

The original Integrated featured 4 output tubes, each with their own transformer making it ideal for bi-amping, but a little complicated for some people's taste.  


Manufactured from 2004 to 2009.

The 4 output tubes were traded for 2 output tubes and 2 rectifiers making the amp simpler to operate and giving it better transparency.  The power stayed the same.
Model SE34I.2+


Manufactured from 2009 to 2012.

The output tube section was upgraded with the Hazen Grid Mod pushing the performance and fidelity of the EL34 beyond what any of us thought possible.  And the amp is now also compatible with KT77, KT88 and 6550 output tubes.


Manufactured from 2012 to 2014.

This is where things obviously changed with the addition of meters and a cleaner layout both internally and externally.  Circuit remains the same, power supply is simplified reducing heat and cost of operation.


Manufactured from 2014 to 2015.

The top plate was changed from white painted aluminum to black powder coated steel adding considerable mass to the chassis.  These are also now made standard with Cryo Treated Beeswax Capacitors like all of the latest Decware amplifiers with black top plates.


Manufactured from 2015 to now.

UFO output transformers become standard.

Weight   18 lbs. ea.
Dimensions   8.0" H x 16.5" W x 12.0" D
Circuit type   Single ended Class A Triode
Power output   5.8 watts RMS into 8 ohms
Input voltage   2.5 volts for full output
Noise / Hum   - 80 dB / -58 dB  
Response   20 Hz ~ 80kHz 
Feedback   ZERO negative feedback used
Rectification   5U4G or 5AR4  / tube rectification
Output tubes   EL34 or 6L6G or KT77 or KT88 or 6550 or 807 with adapter
Signal tube   6N1P, 6N23P, 6H1N, 6922, 6Dj8,7DJ8  or  6N2P
Transformers   Decware
Biasing   Self-Biasing
Resistors   precision WW/MF by DALE, VISHAY
Signal Cap   Cryo-Treated Beeswax foil caps
AC cord   Removable power cord
Consumption   85 watts at full power
Input jacks   RCA type 24K Gold / Teflon
Output jacks   5-way binding posts accept 8 gauge wire
Speaker dB/1w   89 dB minimum / 96 dB or higher is ideal
Warranty   Lifetime to original owner


* Taking advantage of the unique qualities of the EL34 this amp comes standard with the Hazen Grid Mod.  As a result, the transparency and musicality of a triode wired EL34 is improved.

More on the Hazen Grid Technology (also known as the Christmas Comes Early mod) can be
found here and in our forums, here.

SE34I.5 owner's manual


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  !