PRODUCTS : ELECTRONICS : SPHERIS
The Spheris preamplifier sets a new standard for natural musical performance, offer wide bandwidth, extremely low distortion, colourful, superior dynamic range and a three-dimensional holographic soundstage.
- 2 Chassis full-featured class A single-ended & true balanced triode-pentode vacuum tube stereo preamplifier
- Unique new pure vacuum tube-circuit design and maintains an exceptional bandwidth that extends well beyond 500 kHz
- DHT
- 0 dB negative feedback
- Purist tube design (no any transistor) and shortest possible signal paths
- Very low output impedance for driving very long runs interconnect to an amplifier,
and any tube or solid state power amp - Ultra selected, absolute best quality passive components used in all applications
- Central one-point earth grounding
- Fully hand assembled to insure the highest level of craftsmanship
- Limited production
- The beautifully crafted aerospace grade aluminium-brushed, anodized and anti-vibration resonance, non-magnetic chassis shields effectively against RFI and EMI.
- Backlit front panel displays indicate level attenuation & input selection
- All front & rear panel descriptions are engraved
- 3 Platinum knobs (selectors, volume) with backlit glass pivot
- The aluminium feet are resonance absorbing types
- Chassis finish: black
- Elma/Swiss - 4 channel / precision 24 position stepped attenuator volume control with 192 Welwyn ultra linear metal-film resistors 0.1%
- This stepped volume control has gold plated contacts and a channel balance within +/- 0.05db (custom-made for ayon)
- Elma/Swiss - Input selector switches
- Selector switch engages relays located near RCA jacks to switch all inputs
- Gold-plated industrial grade PCB
- Audio circuit boards are anti- resonance-damped mounted
- Silver solder used for the best electrical connection
- 4 Special tubes for stereo line-amplification (tube life min. 10000 hrs)
- 4 Special tubes for stereo phono-amplification (tube life min. 10000 hrs)
- Passive RIAA equalization with 0dB feedback
- Very low noise enables full use of cartridges down to 0.1mV
- High-Current filament regulator for signal tubes and soft start automatic
- Special vibration dampening system for all signal tubes
- Lundhal/Sweden - 2 MC phono transformer
- Lundhal/Sweden - 2 Balanced splitting transformer between single-ended and balanced input
- Tantalum - The best sounding precision special resistors are
used everywhere, best resolution and lowest noise - Mundorf/Germany - Supreme/silver-gold capacitors
- Rifa - Long life capacitors
- DC-Power filter
- Ayon - Premium internal signal cable uses ultra pure, soft annealed copper and super low loss insulation.
- Remote Control for Volume (optional)
- WBT/ Germany - RCA input jacks
- Neutrik/Swiss - XLR chassis connectors
POWER SUPPLY - External tube-regulated & stabilized power supply ( RCA 6AX5GT rectifier tubes )
- A large noiseless toroidal power transformer is encased, excellent damped and RFI/EMI ultra-shielded (custom-made for Ayon)
- Lundhal/Sweden - Dual choke power supply
- Ultimate silver-ceramic fuse / Germany
- AC Phase polarity control indicator
- Warm-up muting period for extending tube life time
- Ayon - Powercord between power supply & preamp
