EAR Yoshino V20 / 2x24W ClassA Triodenbetrieb / Esoteric Audio Research / Tim de Paravincini
Röhrenvollverstärker der Entwickler Legende Tim de Paravincini, der u.a. für Luxman, Quad, Alchemist Audio, Musical Fidelity (den berühmten A1!) und Unity Audio entwicklete.
Durchaus als "magisch" zu bezeichnendes Klangbild: Emotional involvierend und hochauflösend zugleich. Spielt top an unserer Altec Voice of the Theatre, genauso aber auch an modernen Triangle & Harbeth Lautsprechern oder einer klassischen Spendor BC-1 z.Bsp.
2x24Watt ClassA im Triodenmodus mit ECC83S/ECC82 Kombination. Auto Bias. 4x Aux, 1x Tape. Hochwertige Verarbeitung & wunderschönes Design made in England. Gematchte Röhren. Guter Zustand. Wenig gelaufen in Zweitanlage.
Test stereophile:
"The EAR V20 is as much an aural as a visual sculpture—a magical musical instrument designed by a visionary audio maverick. The level of musical detail and involvement I experienced compared favorably with some of the finest tube separates..."
Mehr über EAR & Tim de Paravincini:
Technik:
Class-A, push-pull, enhanced triode, self-biasing vacuum-tube integrated amplifier. Tube complement: thirteen 12AX7 and two 12AU7 per channel. Six line inputs, one tape output. Output power: 24Wpc into 4, 8, and 16 ohms (10.8, 13.8, 16.8dBW, respectively). Frequency range: 12Hz-80kHz. THD: 0.5%. Signal/Noise Ratio: 90dB (A-weighted).
Dimensions: 16½" W by 53/8" H by 173/8" D. Weight: 49 lbs.
SIDEBAR: In Tim's Own Words...
Given the oddball nature of the V20, it's over to Tim for a succinct
description of the circuitry: 'The output stage is unique in several
respects. First, it uses 10 ECC83 'small-signal' triode valves, with 10
triode sections in parallel per phase. Although this valve is normally
only capable of passing small currents, it is used in E.A.R.'s Enhanced
Triode Mode (originally applied to triode-connected pentode valves),
whereby the grid is maintained positive with respect to the cathode, so
that the grid current normally flows. Under these conditions the valve
behaves effectively as a current-controlled device, rather than the
more normal voltage-controlled mode.'
Another of Tim's signature features in the output stage is the use
of his 'Balanced Bridge' connection. 'Unlike the more common push-pull
output, in which signal is taken only from the anodes of the output
valves, the transformer windings are split equally between the anode
and the cathode circuit of each phase, and opposite anodes and cathodes
are coupled via a capacitor to ensure symmetry - especially at high
signal levels where one phase turning on hard forces the opposite phase
to turn off correctly.
'Additionally, 'Balanced Bridge' output connection provides, via the
various primary windings on the transformer, signals suitable for the
application of nested feedback and bootstrapping to earlier stages in
the circuit. Because the output stage has only unity gain (referred to
the grid of the output valves) and draws significant signal current,
the second stage and the cathode follower stage (which provides the
necessary current) must swing high signal voltages and so their anodes
are bootstrapped from the output transformer to ensure linearity.
Signals are also taken from the transformer to provide "nested
feedback" to the cathodes of the input and second stages. Both of these
stages are differential (balanced) for optimum symmetry and noise
rejection.'
