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THÖRESS
Full Function Integrated "Super" Preamplifier
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INSTRUCTION MANUAL
Thank you for purchasing the THÖRESS Full Function "Super" Preamplifier. We
believe our versatile preamplifier to offer the highest possible sonic performance from
both the line and the phono section while preserving a state-of-the-art signal-to-noise
ratio. It is a reference device which will easily measure up to the expectations of even the
most critical and experienced music enthusiast or professional user. Please read the
following explanations and instructions carefully to get the most out of your preamplifier.
PHONO INPUTS AND VERSIONS
The "Super" is available in 3 Version differing only in the circuitry of the phono section
to suit particular types of cartridges in terms of input sensitivity (gain) and cartridge load.
Each version provides 3 phono inputs P1, P2 and P3 selectable with the source dial on
the faceplate. Please note, that detailed information concerning cartridges and vinyl
reproduction in general may be found in the manual of our Phono Enhancer. The
Versions are as follows:
Version 1:
This version offers exceptionally high phono stage gain and customized cartridge loading
on P1, P2 and P3 to make these inputs suitable for low-output, low internal resistance
MC cartridges. Cartridge loading is achieved by means of standard axial lead resistors
soldered to tags adjacent to the phono jacks. These load values are factory preset to 100
Ohms, a value that is suitable for most low-output MC cartridges. Other resistor values
can be preset on request, and these values can be changed by the user whenever it is
required.
The cartridge load values preset on the high-gain MC phono inputs P1, P2 and P3 of
version 1 are printed on the rim of the rear panel for reference.
On these phono inputs any dual-coil low-output dedicated mono MC cartridge can be
used without restriction, the Audio Technica AT33-Mono, the Lyra Dorian Mono or Lyra
Helikon Mono and the excellent Dynavector DV-1s-Mono being examples of such high
grade dedicated dual-coil mono cartridges (all of which are omniflexible).
It is possible to mix stereophonic and dual-coil dedicated mono MC cartridges on
any of the high-gain MC phono inputs of version 1 without further adaptation.
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Summary of Contents for THÖRESS Full Function Integrated "Super" Preamplifier
- Page 1 THÖRESS Full Function Integrated "Super" Preamplifier ............. INSTRUCTION MANUAL Thank you for purchasing the THÖRESS Full Function “Super” Preamplifier. We believe our versatile preamplifier to offer the highest possible sonic performance from both the line and the phono section while preserving a state-of-the-art signal-to-noise ratio.
- Page 2 However, if a single-coil low-output (dedicated mono) MC cartridge is to be used on these (stereophonic) phono inputs and it is intended for dual-speaker-mono listening, precautions must be taken to "double" the mono signal in such way as to avoid hum. Please see the relevant chapter below for more details on using such cartridges.
- Page 3 OUTPUTS To maximize versatility, the preamp includes two paralleled main outputs. Importantly, the output resistance at the main outputs is low enough to drive long interconnect cables and power amplifiers with an input impedance as low as 10,000 ohms without compromising sound quality.
- Page 4 a monophonic tonearm cable is not at hand, a conventional stereophonic tonearm cable can be used equally well (with both plugs inserted into the respective jacks), in which case shorting the inactive left input can be conveniently accomplished at the very end of the left channel lead of the tonearm cable by shorting the "left hot"...
- Page 5 efficient (large horn speakers). A worst-case mismatch scenario is to be expected if both of these conditions were simultaneously met. In order to keep the line amplifier idle noise within inaudible limits the power amplifiers and the speakers need to be suitably matched with respect to input sensitivity and speaker efficiency.
- Page 6 rack and/or there is a mismatch between the tonearm and the phono cartridge (i.e. if the resonant frequency of this combination is too low). In extreme cases, even the power amplifier itself may enter into subsonic resonance if it is poorly designed. If such effects are observed in a setup, lowering the coupling capacitor value in the line section of the preamplifier may be necessary to help increasing the attenuation of subsonic frequencies.
- Page 7 6. Now the preamp can be connected to the mains and switched on. 7. Finally the power amp(s) can be switched on, respecting a delay of about one minute. 8. Select the desired tone source with the source dial, adjust the volume (and balance) for convenient loudness and enjoy the music.
- Page 8 case adjacent to the power inlet. Occasionally, the fuse may blow at the moment the amplifier is switched on. This is due to the current spike drawn by the power transformer. Should this problem arise more regularly it may be advisable to use a fuse with slightly higher current rating.
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