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Welcome to Decware


Classic Stereo Preamplifier

OTL headphone amp


Model CSP3

The Classic Stereo Preamp



The model CSP3 preamp is a purist audiophile tube preamp and OTL headphone amp.  (OTL means output transformerless which is ideal for high impedance dynamic headphones over 100 ohms.)

As a preamp this model has a 20+ year history of making your source sound better.  It features 2 inputs with a master volume control.  

It features adjustable gain for each channel to perfectly match any amplifier, tube or solid state.

Like all Decware products the CSP3 is hand point-to-point wired here in the USA and comes with a lifetime warranty to the original owner.

This preamp adds body, density, weight and tone with absolute transparency.  It is a joy to listen to both in front of an amplifier and through headphones!  Works equally well with tube and solid state amplifiers.

What sets thE CSP3 apart?

  • The Sound - it is one of the better sounding tube preamps made.

  • Massive tube rectified power supply 6 times larger than needed.

  • A signal-path featuring 2 resistors and 2 capacitors.

  • Direct-coupled single-ended triodes running in class A.

  • Direct-Current heater supply for tubes.

  • 4 revisions spanning 20+ years. 

  • Customer Feedback from many 1000's of sales create a highly evolved product.

  • Exotic internals.

  • Output level controls for each channel

  • Input level controls for each channel

  • Master volume

  • Optional second mono or stereo output for subs.

  • Based on the popular 6922 signal tubes.

  • 1/4 inch and 4 pin XLR headphone outputs available.

  • Point-to-point wiring with no circuit-boards and zero negative feedback.

  • Designed by audio guru Steve Deckert.

  • Parts and Labor from the USA.

  • A Lifetime Warranty.


Decware preamps, 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 technique creates uses the least amount of wire and solder nodes.  The power supply is a brute force design sized 600% 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 which is in part where the excellent liquidity comes from.


Steve Deckert / DECWARE


You may choose from several kinds of wood bases.


The Walnut base is standard, but for a small upcharge you can have Cherry, Maple or Oak.  Additionally we can due custom woods and finishes with a more substantial upcharge.



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


Anniversary Mods

Anniversary mods were developed to take this preamp to a level where it can be used with our flagship model SE84UFO25 Zen Triode Anniversary Amp.  The mods enhance speed and the overall resolution to its maximum potential.


These and other options can be configured from within the shopping cart. 


Weight: 17 lbs. ea.

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


Inputs: 2 pair RCA with silver selector switch

Outputs: 2 pair of stereo RCA jacks or 1 pair of stereo RCA and 1 mono RCA.

Gain: 20dB into 100K Ohms.

With a 2 volt source at 0dB there is adjustable output from 0 to 30 volts of output into 100K Ohms


Gain: 11dB into 300 ohms.

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  !

No product

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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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