SE85 Mono Power Amplifier
Best single-ended amplifier for audiophiles seeking pure, rich tube-driven sound.
Experience the pinnacle of tube amplification with the THÖRESS SE85 Mono Power Amplifier. This flagship, all-tube design delivers 20 watts of pure Class-A power, utilizing the revered 845 triode for a richly textured and dynamic sonic presentation. Its zero-feedback configuration and proprietary C-core output transformer ensure exceptional clarity and sonic purity. Meticulously hand-built with point-to-point wiring, the SE85 offers a warm, engaging, and precise audio experience, celebrating the golden age of professional audio.
$10200.00
Owner Satisfaction
4.7
/ 5
Category Rank
551
/ 2553
#551 in Power Amplifiers
Price vs Category Average
+24%
Above average
Output Power
20
/ watts per channel (mono)
Who it's for
- Listeners wanting SET sound with demanding, low-sensitivity speakers
- Audiophiles seeking lifelike, uncolored midrange realism
- Collectors valuing heirloom-grade construction and long-term reliability
Who should skip it
- Budget-conscious buyers seeking accessible high-end amplification
- Users preferring low-maintenance gear without specialized tube costs
- Owners of mismatched or noisy legacy audio components
Performance breakdown
Sonic Texture
The 845 triode delivers a lush, harmonically rich presentation.
Build Integrity
Point-to-point wiring reflects a commitment to uncompromising craftsmanship.
Signal Purity
Zero-feedback design ensures an incredibly transparent and uncolored output.
Load Versatility
Soldered jumpers allow precise matching for diverse loudspeaker impedances.
Power Delivery
Twenty watts of Class-A power demands highly efficient speaker pairings.
Operational Simplicity
Manual configuration and tube maintenance require a dedicated, hands-on enthusiast.
Key Specs
Output Power
20 watts per channel (mono)
Tube Type
845 filamentary power triode
Operation Mode
Single-ended Class-A
Dimensions
150x595xH330 mm (each monoblock)
Weight
18 Kg (each monoblock)
Loudspeaker Load Matching
4, 8, or 16 ohms via soldered jumpers
Driver Stage
Two CV2382 (EL822) power pentodes in triode mode
Chassis Material
Non-magnetic aluminum
Features
- Flagship all-tube mono power amplifier
- Pure Single-Ended Class-A operation
- Proprietary in-house C-core output transformer
- Zero-Feedback design for sonic purity
- High-performance single-stage driver circuit
- Precise loudspeaker load matching
- Low noise operation via DC heating
- Meticulous hand construction
What customers say
The THÖRESS SE85 Mono Power Amplifier earns ecstatic praise for its profoundly natural and emotionally engaging sound quality. Users consistently note exceptional tonal purity and holographic staging, especially praising the midrange realism for vocals and instruments. This meticulous engineering delivers a presentation that is both delicate and dynamically authoritative. Build quality reflects superb German craftsmanship, suggesting a long term investment. The primary considerations are the extreme price and the need for high efficiency loudspeakers due to lower power output. For those achieving the correct system synergy, the SE85 delivers reference level performance, often considered an endgame centerpiece for serious listeners.
Know before you buy
With 20 watts of pure Class-A power, the SE85 performs best with high-sensitivity loudspeakers. It is designed to drive a wide range of loads, but you will achieve the most dynamic results when paired with efficient designs that do not require massive current to reach realistic listening levels.
The SE85 features internal loudspeaker load matching for 4, 8, or 16-ohm speakers. This is configured via soldered jumpers inside the unit, ensuring an optimal electrical match between the output transformer and your specific speakers.
As with any high-end tube amplifier, you will eventually need to replace the 845 power triodes and the CV2382 driver tubes once they reach the end of their service life. Because the unit uses DC heating for low-noise operation and point-to-point wiring, it is built for longevity and ease of service by a qualified technician.
Yes, provided you have a separate DAC or a preamplifier with digital inputs. The SE85 is a dedicated power amplifier without an internal DAC, meaning it is designed to act as the pure, high-fidelity engine for your system, allowing you to choose your own digital source components.
The zero-feedback configuration avoids the phase shifts and timing errors often associated with global negative feedback loops. This results in a more natural, open soundstage and a level of sonic purity that preserves the harmonic texture of the original recording.
Each monoblock weighs 18 kg (approximately 40 lbs), so you will need a sturdy, stable surface for placement. Given their dimensions and weight, ensure your rack or stand can accommodate the footprint of 150x595x330 mm per unit.
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