Tube Power Amp Reviews

Thöress 300B monoblock power amplifier Associated Equipment

Sidebar 2: Associated Equipment

Analog Sources: Garrard 301 turntable; EMT 997, Thomas Schick tonearms; Ortofon SPU-A & SPU 95th Anniversary & CG25i, Miyajima Premium BE Mono II, EMT OFD 15 & TSD 15 pickup heads.
Digital Sources: Halide Designs DAC HD USB D/A converter; Apple iMac G5 computer running Audirvana Plus v.1.5.12; Sony SCD-777ES SACD/CD player.
Preamplification: Hommage T2 step-up transformer, Shindo Masseto preamplifier.
Power Amplifiers: Shindo Corton-Charlemagne (monoblocks) & Haut-Brion.
Loudspeakers: Altec Valencia, DeVore Fidelity Orangutan O/96.
Cables: USB: WireWorld Revelation 2.0. Interconnect: Audio Note AN-Vx, Nordost Blue Heaven, Shindo Silver. Speaker: Auditorium 23.
Accessories: Box Furniture Company D3S rack (source & amplification components).—Art Dudley

COMPANY INFO
Reinhard Thöress
US distributor: Audioarts, Inc.
210 Fifth Avenue, Suite 301
New York, NY 10010
(212) 260-2939
www.thoeress.com
ARTICLE CONTENTS

COMMENTS
manisandher's picture
Submitted by manisandher on April 18, 2017 - 12:46pm

I've just received my Thöress 300B monos, set up by Reinhard to work with Elrog 300B output tubes. Feeding my Tune Audio Anima horn speakers (109dB/W@1m), I have to say I have the most satisfying sound I've ever managed to achieve in this hobby. I concur with Art's description of the sound, though the Elrog tubes are substantially better than the regular Full Music tubes.

Reinhard took a frequency response measurement of the amps before shipping them out to me. The measurement was taken on the PRIMARY side of the OPT, with a 5 Ohm wire wound resistor as dummy load across the secondary. (He believes this is the best way to take the measurement as the OPT secondaries do not carry a ground potential.)

The amps measure -3dB at 7.5Hz and 150kHz. Also, there is virtually no OPT resonance above 150kHz. Pretty good for a SE amp with zero feedback! And as I said, they sound utterly fantastic.

Mani.

directdriver's picture
Submitted by directdriver on May 9, 2023 - 3:50am

What is the point of measuring the amp at the transformer's primary when your speaker is connected to the secondary? You're bypassing the output transformer to get better results. That's cheating!

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