Hei har du noen spesifikasjoner og lignende.
Tenker ikke på målinger og slikt.
Når en tenker på en preamp til 1/4 mill så bør en få litt for pengene også.
Derfor : Hvordan den er bygget opp. Krets - PSU - mekanisk demping etc.
EDIT:
Mener: Når og om du tenker i disse bare - sjekk Audio Note sine gromme saker. Kanskje de som er mest gjenstand for å bli kopiert rørmessig og med god grunn.
Audio Note M9 - en av de som konstruktøren er mest fornøyd med.
http://www.audionote.co.uk/products/preamp/m9_phono_01.shtml
http://ayonaudio.com/ayon/english/spheris/f-spheris.htm
Features
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
WBT/ Germany - RCA input jacks
Neutrik/Swiss - XLR chassis connectors
EXTERNAL AC~REGENERATOR - TUBE POWER SUPPLY
The Spheris AC~ Regenerator offers stable, regulated and purified AC power regardless of the incoming AC line quality. This power supply provides a lowered noise floor, more liquidity, better spatial three-dimensional imaging, greater focus, richer colours, and decreased glare & haze.
Features
Tube regulated power supply with built in AC ~ Regenerator
Regenerated AC power and low distortion sine wave
Superior noise reduction
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.
All front & rear panel descriptions are engraved
The feet are resonance absorbing types
Chassis finish: black
AC phase polarity control indicator
AC voltage and frequency meter
DC-Power filter
Voltage adjustable (100V to 115V and 200V to 230V)*
Frequency adjustable (50Hz, 60Hz & 120Hz)*
Tube-regulated & stabilized (RCA 6AX5GT rectifier tubes)
Lundhal/Sweden - Dual choke power supply
2 large noiseless toroidal power transformers are encased, excellent damped and RFI/EMI ultra-shielded (custom-made for Ayon )
Specifications
Tube Preamplifier Ayon Spheris
Class of Operation Pure Class A, Triode-Pentode
Tube Complement Preamp-Line 4 x Siemens C3M
Tube Complement Preamp-Phono 4 x Siemens C3M
Maximum Output (at 1 khz ) 40V rms
Input Impedance 100 KOhm
Output Impedance 30 Ohm
S/N ratio 98 dB
Frequency Response / Line 1Hz - 500kHz
Harmonic Distortion (at 1V ) Line 0.001%
Harmonic Distortion (at 1V ) Phono 0.01%
Input 4 x RCA, 1 x XLR, 2 x Phono MC
Output 2x RCA, 1x XLR
Power consumption 65 Watts
Dimensions Pre (WxDxH) cm 48x43x14 cm
Weight (Pre & Power Supply) 20 kg
Specifications
AC Regenerator - Tube Power Supply Ayon Spheris
Tube Complement Power Supply 2 x RCA 6AX5GT
Power consumption 10 Watts
AC Regenerator max.150W
Voltage adjustable* 100V to 115V and 200V to 230V
Frequency adjustable* 50Hz, 60Hz, 120Hz
Start up voltage & frequency 230V / 50 Hz
Dimension (WxDxH) cm 48x43x14 cm
Weight (Power Supply) 25 kg