Feliks Audio Euforia 20th Anniversary Tube Headphone Amp w/ Spare Svetlana 6AS7 Tubes

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General:
If you’re in the market for a super impressive tube headphone amplifier, the Feliks Audio Euforia 20th Anniversary Edition deserves serious consideration.

Feliks Audio is renowned for its handcrafted tube amplifiers made in Poland, and the Euforia 20th Anniversary is a perfect showcase of their craftsmanship and experience. This special edition celebrates two decades of amplifier design and refinement, resulting in an amp that balances musicality, transparency, and classic tube charm.

Unlike many tube headphone amplifiers on the market that rely on hybrid designs, the Euforia 20th Anniversary Edition is a true, full-tube OTL (Output Transformer-Less) design, utilizing both tube drivers and tube power stages. This approach delivers exceptional purity, openness, and natural tone—especially when paired with high-impedance headphones.

The amplifier comes fitted with Psvane CV-181 Mk2 Gold tubes in the driver stage and NOS 6N13S tubes for power, offering a rich yet controlled presentation with excellent soundstage and harmonic depth. Additionally, a tested spare set of Svetlana 6AS7 power tubes is included, giving you flexibility for tube rolling and future enjoyment.

Sonically, the Euforia is known for its smooth midrange, extended highs without harshness, and a surprisingly tight and articulate low end for an OTL design. 

This particular example is in excellent condition all around and sounded great in testing.

SkyFi Cosmetic Notes:
Unit is in excellent condition, no visible wear notable. other than some hairline scratches. The included manual is a printed copy, not original.

SkyFi Technical Notes:
A spare set of Upscale Audio tested Svetlana 6AS7 tubes is included with your purchase.

Ownership:
Single Owner

Connections:
RCA, IEC Power.

General Sound:
Smooth, uncolored, undistorted natural and clean

Cosmetic Condition:
8/10 = Very Good. Excellent front faceplate, one minor flaw on chassis side or top. See our detailed rating description here.

Working Condition:
Working perfectly and tested in our lab and listening room.

Included:
Exactly as pictured and described above.

Packing:
Will be packed using our highly developed in-house process and custom packing materials.Reviews:
Click Here

Original MSRP:
$3,499.00

Specs:
- Design: OTL (Output Transformer-Less), Class A
- Topology: Fully tube-driven (driver and power tubes)
- Tube Complement:
- Driver: 2 × CV-181 / 6SN7 type
- Power: 2 × 6AS7 / 6N13S type
- Output Impedance: Optimized for high-impedance headphones
- Headphone Compatibility: Typically best with 80–600 ohm headphones
- Inputs: 1 × RCA (single-ended)
- Outputs: 6.35mm (¼") headphone output
- Construction: Hand-built in Poland
- Edition: 20th Anniversary model with upgraded components and finish

Dimensions:
11.6″ x 8″ x 6.5″ (310x205x175 mm)

Weight:
13.2 lbs.

Link to Manual:
Click Here

Recommended Cables:
Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Kimber Kable - Power Cords - Better

Kimber Kable - Power Cords - Best

Testing Process:
We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect resistors and other passive components for signs of overheating. If tube arcing has occurred in the past we can usually spot discoloration on the output tube sockets. On vintage units we often spot check select capacitors for value and ESR.

If the amplifier passes visual inspection, we move on to a full test of all of the tubes. We use a modern Amplitrex AT-1000 Professional Tube Tester which is capable of testing both emission and Gm with a high degree of accuracy.

We document the results of each tube and replace any weak or suspect tubes before proceeding.

When we power on tube amplifiers for the first time we usually use a variac and current limited AC supply and slowly raise the voltage up to nominal mains level while monitoring plate, screen, filament, and negative bias supply voltages where applicable.

If everything is in order we feed a low level test signal into the amplifier’s input and monitor its output on an oscilloscope across an 8 ohm dummy load. At this point we are just looking to verify basic function and confirm that the output transformers are not damaged.

Once we have verified that the amplifier is safe to operate, we connected it to full mains power. For fixed bias amps we set the bias to manufacturer spec. For cathode biased amps we monitor the plate to cathode voltage to determine if the output tubes are operating in a safe range. Once the output section is verified we move onto bench evaluation.

We start by feeding the input of the amplifier with a low level 1 KHz test signal, slowly increasing its amplitude while monitoring the amplifier’s output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance.

We finish off the bench evaluation with a 1 KHz square wave check and a 20 Hz to 20 KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.

Before the device leaves the bench we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.

If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours minimum.

For tube amps we like to run this test at least twice.

This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when it has fully come up to temperature. We find this step to be essential, especially for vintage units.