Included module blocks
- 1 x Module AM1 Power pack - for one preamplifier and two power amplifier modules, using a vacuum valve as high- voltage rectifier.
- 2 x Module AM4 Power amplifier modules : Single Ended 300B triode (8 Watt/channel)
- 1 x Module AM5 Preamplifier modules : Passive Preamp with four line inputs and line transformers providing +3dB and +9dB gain.
Optional upgrades:
- 1 x Module AM6 (in place of AM5) : RIAA / Tube Preamp with 2 phono and 3 line inputs.
- Hashimoto step-up transformers -- 1 or 2 low impedance moving-coil-phono cartridges can be operated simultaneously.
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General Intro
This unique modular amplifier system is a 100% tube design, and allows you to get exactly the configuration you need, at the highest quality level and with the best sound possible today.
Combining a choice of pre- and power amplifiers on a common mechanical mainframe, the A.M. System cannot only compete with separate components, but outperforms them due to the following physical and electrical advantages.
Circuit & General Construction
– Shortest signal path, connectors and cables used for connecting separate components are eliminated.
– The design eliminates impedance and gain mismatch and reduces the number of active circuits.
– The oversized common power pack has five separate secondary windings and three voltage regulators.
– Separate ground wiring together with central ground connection and ground lift for best signal purity and lowest hum and noise.
– Multiple mechanical suspensions thru damping blocks separate the different elements mechanically and electrically. Between power transformer and RIAA amplifier for example, vibrations are filtered not less than four times!
– The system's frame is cast from the same austenitic iron alloy as used for the famous swissonor#1 non-magnetic platter for Thorens TD124 .
– Together with the insulated module front plates, milled from 5 mm aluminium, the design guarantees freedom from vibration, magnetic induction and eddy currents usually found in classical enclosures.
A.M. 4
Single Ended power amplifier using 300B Triode
– Using one direct heated 300B Triode in SE class A circuit due to the fantastic soundstage illumination.
– No overall negative feedback at all.
– Optimized preamp/driver stage for the extremely demanding 300B driving
– Output power of 8 W per channel, optimised for speakers with sensitivity from 92dB (1W, 1m) up.
– Extremely stable when driving real loudspeakers loads with triode mode and zero overall negative
feedback
Our first product was the non-magnetic cast iron main platter for the classical Thorens TD124 turntable. Equipped with multiple Swissonor.ch upgrade parts, the Schopper Mod's for Thorens TD124 was declared “Product of the year 2008” by Stereophile's Art Dudley. Yes, a more than 50 year old upgraded turntable can be state-of-the-art! Since then, Swissonor produces a complete genuine product range with a single goal- achieving best sound performance from analogue sound sources.
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