Ether
from $42,300 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
Linear, fast and full of timbre
The sound is linear and fast, with real timbre on voices and acoustic instruments and a dense, energetic bass.
Two blocks
A power supply of about 100 kg
The amplifier weighs about 30 kg; its power supply, with kenotron rectifiers and large bespoke chokes, about 100 kg. It keeps the background black even on noisy mains.
Loudspeakers and headphones
One amplifier for both
Speaker terminals and headphone outputs on the same amplifier: 6.3 mm and 4-pin XLR as standard; Pentaconn, dual XLR or electrostatic to order.
Any music
From a voice to an orchestra
Vocal, acoustic, orchestral and rock recordings alike.
Made to order
Built by hand, one at a time
Selected NOS tubes, custom-wound transformers and chokes, Proprietary “RareCoreFusion” Alloy wiring. Each Ether is built by hand to order and numbered on its nameplate.
Ether
Numbered unit — Opus No. on the nameplate
- Model
- Class A single-ended amplifier on GM-70 Triode / GK-71 Pentode transmitting tubes, 25 W
- In brief
- Transmitting tubes, single-ended in pure Class A, 25 W per channel, in two blocks built by hand.
- Queue deposit
- 50% · from $21,100
- 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 $63,400 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 Dominion collection
- Music it suits
- Vocal · acoustic · orchestral · rock
- Compared with
-
- GK-71 pentode version
From the atelier
Ether is built around GM-70 Triode / GK-71 Pentode transmitting tubes running single-ended in pure Class A at 25 W per channel. The sound is linear and fast, with real timbre on voices and acoustic instruments and a dense, energetic bass. It comes in two blocks: the amplifier itself (about 30 kg) and a power supply of about 100 kg with four 6D22S rectifiers and large bespoke chokes. That supply keeps the background black even on noisy mains.
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 external power supply uses kenotron rectification, galvanic isolation, bespoke chokes and custom power transformers.
- Output stage: GM-70 Triode / GK-71 Pentode
- Input stage: AL4 (EF55 optional)
- Rectifiers: 4 × 6D22S, or 2 × 5C3S for a brighter tone
- Ground lift switch; RCA inputs, XLR optional
| Component | Manufacturer | Country of origin |
|---|---|---|
| Output tubes GM-70 Triode / GK-71 Pentode | NOS, selected | US / EU / UK (NOS) / Other Vintage |
| Input tubes AL4 | NOS, selected | US / EU / UK (NOS) / Other Vintage |
| Rectifier tubes 6D22S | NOS, selected | US / EU / UK (NOS) / Other Vintage |
| Power and output transformers, chokes | Demograf Audio (custom-wound) | or analog by Hashimoto / Tango / Tamura |
| Volume control | ALPS | Japan |
| Internal wiring: Proprietary “RareCoreFusion” Alloy | Demograf Audio | Own manufacture |
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 · 0.6 MB
Measured on the stock configuration; options may change the figures.
- Use
- Universal: loudspeakers and headphones
- Output power
- 25 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 × GM-70 Triode / GK-71 Pentode
- Input tubes
- 2 × AL4 (EF55 optionally)
- Rectifier tube
- 4 × 6D22S for a warmer/darker tone or 2 × 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)
- About 130 kg / 287 lb in total: amplifier about 30 kg, power supply about 100 kg
- 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 $63,400
Input tubes
- AL4 Stock
- EF55 — for a more vintage, analogue sound
- Other Type (on request)
Rectifier tube
- 6D22S — for darker sound Stock
- 5C3S — for brighter sound
- Other Type (on request)
Output tubes
- GM-70 Triode Stock
- GK-71 Pentode
- 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
- On-the-fly Pentode / Triode Operational Mode Toggle Switch
- 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 Ether use?
Stock output tubes are GM-70 Triode / GK-71 Pentode, the input stage uses AL4 and the supply four 6D22S rectifiers. Tubes are measured and matched before fitting; a reserve matched pair can be ordered with the amplifier.
How is the Ether 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.
Which mains voltage and plug?
Each piece of gear is built for 100 V, 120 V or 230 V mains with the matching plug (NEMA, Schuko or BS 1363 / type G). The voltage is fixed at order time, so tell us where the unit will be used.
How long does the Ether take to build?
Build time is six months or more from the queue deposit, depending on the configuration and the queue; delivery takes from one month after completion. The atelier builds seven instruments a year. A priority build is available for an extra 50% of the price: your unit is moved ahead in the build queue.
* 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.
