Butikk Thøress EHT

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P R O D U C T D E S C R I P T I O N
Our Hybrid Triode Integrated Amplifier (EHT Integrated) offers 20 watts of output
power per channel into a 6 ohm load combined with very low output resistance
(high damping factor). Such providing excellent drive capability for loudspeakers
with medium to low efficiency or with critically low impedance which may present a
challenge for our all-tube single-ended triode amplifier models. While offering the
same level of ultimate sonic excellence without involving exotic costly power tubes.
The amplifier comprises 4 inputs (RCA jacks) with equal gain status selectable via
rotary dial. Furthermore, the amplifier features a proprietary remote volume control
presented with typical THÖRESS style and attention to detail using a high grade
motor-driven dual-potentiometer. This part is made to our specifications for low
angle sensitivity (conveniently fine volume adjustment) by ALPS in Japan. Each
individual potentiometer module is selected from a large production batch for
exceptionally good channel balance by careful measurement (0.3dB tolerance).
The amplifier is built with meticulous hand construction using our proven point-topoint
wiring techniques, whereas much care has been taken in arranging each
aspect of the internal construction to ensure low noise performance, ease of service
and the highest reliability for many years to come. It is an ultimate component in
every sense and as such a perfect complement to our Parametric Phono Equalizer
(Phono Enhancer). Particularly when combined with our under-hung voice-coil 1D66
or horn based 2CD12 loudspeaker the sonic presentation of the EHT Mono Blocks is
of the utmost refinement which will certainly meet the expectations of even the
most critical and experienced music lover.
EHT TOPOLOGY
The amplifier is based on a unique minimalist single-ended zero-feedback vacuum
tube MOSFET hybrid topology which we call EHT Topologyafter E.intakt-H.ybrid-
T.riode, Single-Ended Hybrid Triode. Deliberately ignoring the fact that many music
lovers persistently believe in the myth that balanced technology (and the associated
XLR connectors and cable configuration) is generally superior over single-ended
concepts. Readers who want to learn more about our view on balanced techniques
and our general design approach are encouraged to read the paper (THÖRESS -
Behind the Curtain) available on request.
The EHT topology consists of a single-ended triode gain stage (6J5GT vacuum tube)
followed by a unity gain MOSFET output stage also operated in single-ended class-A
mode with high idle current. It allows to fully exploit and mate the most desirable
characteristics of both vacuum tube and solid state devices determined by their very
nature. In spite of its elegance and extremely high sonic capability, the EHT concept
has never been utilized in a serial audio product before, as far as we know. Probably
on account of its low power efficiency and because its implementation is rather
tricky.
Basic analysis easily shows that...
The EHT principle represents the PUREST form of all possible single-ended triode
power amplifier configurations!
Specifically, it can be shown that a higher output power can be more easily obtained
with the EHT than with an all-tube amplification principle, without compromising
sound quality. Simply, because in the former case the typical vacuum tube
impedance matching output arrangement (power tube driven output transformer
with high step-down ratio) can be fully omitted. Therefor the voltage swing required
for a specific power output is up to 10 times (!!!) lover for the EHT configuration
compared to an all-tube topology, resulting in a proportional reduction of non-linear
distortion. This crucial insight led us to the design of the EHT Integrated and the EHT
Mono Amplifier.
STABILITY
The EHT Integrated Amplifier operates with impecable thermal stability and is fully
short-proof at the output without the aid of any kind of (sound degrading)
protection circuitry. Moreover, a switch-on delay module (another protective
feature often found in commonly constructed solid state or hybrid amplifiers) is also
omitted because no disturbing noise or harmfull signal is developed at the output
when the amplifier is powered on or off.
MAINS TRANSFORMER
The EHT Integrated Amplifier is equipped with a proprietary mains transformer
produced in-house to ensure the highest possible quality and reliability. This part
features a highly elaborated dual-coil winding on a large tape wound cut core (Ccore)
and has been optimized for low body noise emission and low leakage.
Nevertheless, the mains transformer is mounted to the chassis via isolation
elements in order to eliminate even the slightest interference of residual
transformer vibrations with the circuit. Since the mains transformer is produced inhouse
we can easily built transformers for all kinds of mains voltages on demand, for
example 100Vac (Japan), 220Vac (South-Korea, China, Thailand, Indonesia) or
245Vac (Australia).
F E A T U R E O V E R V I E W
 Vacuum Tube MOSFET Hybrid Integrated Amplifier with 20 watts of output
power per channel (into a 6 ohm load).
 Driving capability for critical loudspeaker loads due to very low output
impedance (high damping factor).
 Ultimate sonic excellence on par with no-compromise all-tube single-ended
triode amplifiers, yet without involving exotic and costly power tubes.
 Unique minimalist zero-feedback EHT schematic: single-ended triode gain stage
(6J5GT tube) driving a unity-gain MOSFET output buffer operated in single-ended
(class-A) mode with high idle current.
 Total avoidance of protection circuitry.
 4 line level inputs (2x4 RCA jacks) with equal gain manually selectable via rotary
dial.
 Remote volume control via high-grade motor driven dual potentiometer with
excellent channel balance and low angle sensitivity (for conveniently fine volume
adjustment).
 High grade electrolytic capacitors made in Germany in the power supply.
 Low noise low leakage dual-coil C-Core mains transformer made in-house for
230Vac (115Vac via jumper setting), 100Vac (Japan), 220Vac (South-Korea,
China, Thailand, Indonesia) or 245Vac (Australia).
 Full hand construction, point-to-point wiring throughout.
 Non-magnetic aluminum casework, anodized printing on front and rear panel,
powder-coated lids.
 Dimensions 434x450x184 mm, 184=20 (feet)+134+30 (tubes over case),
450=434+16 (speaker binding posts).
 Dimensions of the shipping crate: 650 x 650 x 350 mm, weight 18Kg.