Eurybia
from $26,600 Made to order
Request a build slot Deposit, lead time and warrantyAll units in the photos are real. Some photos are AI-enhanced to improve image quality.
Sound
Dense, full and saturated
The bass is dense and full, the midrange heavy and saturated, the overall picture slightly darkened — immersive and free of fatigue.
2 W per channel
For sensitive loudspeakers and headphones
Loudspeakers of about 98 dB and above, such as Orpheus at 103 dB, suit its 2 W, and a 6.3 mm and a 4-pin XLR output serve headphones. A push-pull version doubles the power for less sensitive loudspeakers.
Eurybia
Numbered unit — Opus No. on the nameplate
- Model
- Class A single-ended integrated amplifier on 2A3 triodes, 2 W
- In brief
- For listeners who value tonal weight above all.
- Queue deposit
- 50% · from $13,300
- Lead time
- Seven pieces of gear a year, each built by hand to order. Current lead time: six months or more.
- Push-pull (PP)
- The stock build is single-ended. A push-pull version is built to order for +50% of the price. Push-pull from $39,900 Request a push-pull build
- Origin
- Made in Kazakhstan by Dmitriy Gubchenko
- Warranty
- 1 year (extra warranty available: +1 or +2 years)
Part of the Legacy collection
- Music it suits
- Vocal · blues · chamber music · late-night listening
- Compared with
-
- Audeze LCD-2 (without Fazor) — as a sound analogy
From the atelier
Eurybia runs two 2A3 triodes single-ended in pure Class A, 2 W per channel, and is voiced for tonal weight. The bass is dense and full, the midrange heavy and saturated, and the overall picture slightly darkened — immersive and free of fatigue. If a comparison helps, the 2A3 is to amplifiers what the Audeze LCD-2 without Fazors is to headphones.
Who Eurybia is for
Eurybia is for a listener who puts density and tone colour ahead of power: vocal music, blues, chamber music and quiet listening late at night. Its 2 W need loudspeakers of about 98 dB and above, such as the three-way Orpheus at 103 dB, in a small or medium room of about 20–30 m². The same chassis serves headphones. For less sensitive loudspeakers there is a push-pull version with double the power.
The model
The 2A3 is a directly heated triode from the early 1930s with a 2.5 V filament. Eurybia comes as two chassis: the amplifier, and an external supply with a kenotron rectifier, galvanic isolation, custom transformers, capacitors and chokes. The input stage uses two 6Zh4 as standard, and the rectifier is the 6D22S, with the 5C3S as an option.
We state the power the amplifier delivers in pure Class A at the stated distortion; the figure comes from the unit’s own measurement report.
All tube amplifiers are built as two-chassis designs by definition, with a galvanic-isolation transformer and a ground-lift switch.
The stock build, stage by stage:
- Output: 2 × 2A3, selected and matched
- Input: 2 × 6Zh4, NOS (EL8, AL4, EF14 or ML6 to order)
- Rectifier: 6D22S (5C3S optional)
- Transformers and chokes: custom-wound (Hashimoto, Tango or Tamura to order)
- Volume: ALPS potentiometer
- Ground lift switch
| Component | Manufacturer | Country of origin |
|---|---|---|
| Output tubes 2A3 | Selected and matched | US / EU / UK (NOS) / Other Vintage |
| Input tubes 6Zh4 | NOS, selected | US / EU / UK (NOS) / Other Vintage |
| Rectifier tubes 6D22S | NOS, selected | US / EU / UK (NOS) / Other Vintage |
| Transformers and chokes | Demograf Audio (custom-wound) | or analog by Hashimoto / Tango / Tamura |
| Volume control | ALPS | Japan |
Photo {n} of {total}
Simplified diagram of the stock configuration. The exact circuit for your options is confirmed with the atelier.
When delivering to countries that have imposed sanctions, we do not install sanctioned components; we fit vintage and modern equivalents instead.
Specification
Download the brochure PDF · EN · 0.8 MB
Measured on the stock configuration; options may change the figures.
- Use
- Universal: loudspeakers and headphones
- Output power
- 2 W per channel at 8 Ω (Push-Pull version with double power available on request)
- Amplifier class
- Pure Class A
- Channels
- 2 (Stereo)
- Inputs
- Analogue RCA (Optional: Balanced XLR)
- Headphone outputs
- 1 × 6.3 mm TRS, 1 × XLR 4-pin (Optional: 2.5 mm, 3.5 mm, 4.4 mm Pentaconn, dual XLR 3-pin, or Electrostatic/EST connector)
- Speaker outputs
- Standard binding posts (Demograf Audio terminals optional)
- Load impedance
- 8 Ω (Optional: 4 Ω / 16 Ω customisation)
- Output tubes
- 2 × 2A3
- Input tubes
- 2 × 6Zh4 or other types optionally e.g. EL8 / ML6 etc.
- Rectifier tube
- 2 × 6D22S for a warmer/darker tone or 1 × 5C3S for a brighter signature (option)
- Volume control
- ALPS potentiometer (Demograf Audio stepped attenuator optional)
- Internal wiring
- Proprietary “RareCoreFusion” Alloy wire (other options available)
- Special features
- Ground Lift switch (selectable ground loop isolation)
- Mains
- 100 / 120 / 230 V — set at order time, plug to match (NEMA, Schuko, BS 1363 / type G)
- Weight (with power supply)
- From 45 kg / 99 lb
- Dimensions
- From 450 × 450 × 250 mm
Custom options
Stock items are included in the price. Every option is agreed with the atelier before the build starts.
Circuit
- Single-Ended (classic detailed sound) Stock
- Push-Pull (double the output power, a fuller midrange and bass) +50% from $39,900
Input tubes
- 6Zh4 tubes Stock
- EL8 Valvo — for more detailed sound
- AL4 — for heavier bass and midrange
- EF14 — for a more natural midrange, e.g. opera and symphonic music
- ML6 — for more neutral sound
Rectifier tube
- 6D22S — for darker sound Stock
- 5C3S — for brighter sound
- Other Type (on request)
Output tubes
- 2A3 Stock
- Other similar Tubes (on request)
Component upgrades
- Premium Capacitors Suite (Duelund, Mundorf, Miflex etc.)
- Tango, Tamura or Hashimoto transformers and chokes, fitted on request
- Silver AMRG Resistors & Premium Cardas Wiring Kit
- High-End Connectors Suite (e.g. Furutech Top-Tier plugs)
- Solid-core Copper Speaker Connectors
- Premium Solid-core Copper Connectors with Galvanic Gold/Silver Plating
- Vintage Tubes
- Integrated Tone Control Block Module / Filter
- Transformer taps for 4 or 16 Ω (additional winding)
- Bi-wiring integration supplement
- Tri-wiring integration supplement
- One additional Analogue RCA Input
- One additional Analogue XLR Balanced Input
- Demograf Audio High-End Swiss-Stepped Pre-Amp (similar to Stevens & Billington TX-103)
- Variable GAIN Control Module
- 4.4 mm Pentaconn Output Termination
- Dedicated STAX Electrostatic Output Interface
- Fully Balanced XLR Amplifier Architecture
- Additional Reserve Matched Pair of low-noise Tubes
Mains inlet, outlets & contacts
- AC Input: Standard Spec — IEC C14 Chassis Input Stock
- AC Input: Heavy-Duty Spec — IEC C20 High-Current Inlet
- AC Output: European Standard — Schuko (Type F)
- AC Output: US / Japan Standard — NEMA 5-15R (Type B)
- AC Output: British Standard — BS 1363 (Type G)
- AC Output: Universal Interface — Direct IEC C13 Outlets
- Contacts: Pure Copper Unplated (Organic & Balanced Tone) Stock
- Contacts: Gold Plated e.g. Furutech FI-09(G) (Warmth & Rich Midrange Texture)
- Contacts: Rhodium Plated e.g. Furutech FI-09(R) (Fast Transients & Fine Detail)
Finish & chassis
- Standard configuration Stock
- Priority build (+50% of the price)
- Precision-Milled Metal Chassis (CNC milling)
- Contoured Bent-Metal Enclosure
- Exotic Hardwood Chassis
- Glass-Integrated Aesthetic
- Premium Wood Inlays & Accents
- Solid-Billet Metal Enclosure
- Advanced Galvanic Finishing
- Custom Dimensions & Form Factor
- Parameter Status Display
- Multifunction Remote Control Suite
- Protective tube cage (child & pet safety)
Regional version
- 230 V — Schuko plug (Europe) Stock
- 120 V — NEMA plug (North America)
- 100 V — NEMA plug (Japan)
- 230 V — BS 1363 / type G plug (UK · Middle East)
Pairs well with
Which tubes does the Eurybia use?
Two 2A3 output triodes, two 6Zh4 input tubes and two 6D22S rectifiers; a 5C3S rectifier is an option. The 2A3 dates from the early 1930s and was made in single-plate and dual-plate versions. EL8, AL4, EF14 or ML6 input tubes can be chosen at order time.
Is 2 W per channel enough?
With the right loudspeakers, yes. Eurybia is meant for loudspeakers of about 98 dB and above in a small or medium room at normal listening levels; with 100 dB loudspeakers it reaches about 103 dB at 1 m. For less sensitive loudspeakers, ask for the push-pull version with double the power.
What does the comparison with the Audeze LCD-2 mean?
It compares character, not technology: the 2A3 is to amplifiers what the Audeze LCD-2 without Fazors is to headphones. In Eurybia that means a dense, full bass, a heavy and saturated midrange and a slightly darkened picture that does not tire.
Can the Eurybia drive headphones?
Yes. Beside the loudspeaker terminals it has a 6.3 mm and a 4-pin XLR headphone output, and a 2.5 mm, 3.5 mm, 4.4 mm Pentaconn, dual 3-pin XLR or electrostatic connector can be added to order. The 6B4G is an octal-base relative of the 2A3; in owner reviews in our Journal, a 6B4G amplifier made the Sennheiser HD 800 fuller and darker.
How is the Eurybia serviced?
Each unit ships with its own measurement report. The circuit is kept simple and serviceable, and Demograf Audio gear is serviced for as long as parts exist.
How is it delivered?
Shipping and insurance are paid by the buyer and shown as a separate line in your quotation. Every unit is packed for long-distance transport in heavy-duty flight cases and a wooden crate.
* Photos are taken from real systems and show the specific configuration of a particular customer; your unit can look the way you want — all our equipment is fully customisable.
