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philosophy is to design our products to neither add to,nor detract from, the
music. We never attempt to cover up a design problem with another problem, nor
do we try to introduce a supposedly complementary problem to "synergise"
with it. Two wrongs do not make a right. Only the eradication of the problem is
SL1 Ultimate is the product of relentless refinement to the original SL1
introduced in 1985. We have identified and eliminated every electronic artifact.
Rather than attempting to "synergise" with badly flawed systems, this
preamplifier is designed to allow superior systems to reach their fullest
potential. The SL1 Ultimate also makes the perfect first step toward assembling
such a system. Available with or without Phono Stage.
Power Supply Chassis contains the transformer's magnetic field eliminating it as
a source of hum. Rectification, Initial Regulation, and Noise Filtering are all
performed in the EPS thereby delivering Pure Quiet DC Power into the main
chassis eliminating the grain and dryness associated with noise intermodulation.
Independent Fully Regulated Filament Supplies eliminate the dynamic compression
caused by filament to filament crosstalk. These supplies are also noise
Slow Filament Power-Up extends tube life greatly. Quadruple Cascaded Audio Power
Supply combines twenty two zero-feedback regulators with over thirty energy
storage and bypass capacitors for unequaled dynamic life, soundstage precision
Isolation Transformer eliminates entry of Radio Frequency noise through the AC
power line yielding greater benefits than any of the expensive add-on power line
conditioners without any of their sonic shortcomings.
Vacuum Tube Circuitry for vibrant and natural music. Extraordinarily Quiet High
Gain Phono Amp (Optional) accommodates both high and low output cartridges.
Fastest Tube Preamplifier, without any of the high frequency circuit-induced
edginess which slower preamps frequently substitute for real speed. This speed
is maintained even into long runs of cable.
Lowest Open Loop Distortion of any preamp yields unforced detail and resolution
which must be heard to be believed.
Low Feedback Ratios eliminate the aggressiveness of high feedback designs and
yet still maintains correct focus.
Matched Output Impedance snubs reflections on interconnects quickly, yielding
exquisitely lucid midvange and treble.
Very Strong Steel Chassis with anti-RFI plating ensures hum and RF free
operating environment for the circuits.
Damping Material lines both chassis to stop mechanical resonances which would
otherwise modulate the electric fields in the preamp.
Mechanical Isolation from floor vibrations provided by high loss viscoelastic
Low Loss Circuit Board Material combines the transparency of hard wiring with
the low resonant signature and musicality of a circuit board.
and Volume Controls are military grade rotary switches with solid silver
contacts wired with precision resistors. • CAT Manufactured RIAA Capacitors
use a unique dielectric with several times lower loss than any other dielectric
including TFE Teflon.
Best Sounding Precision Resistors are used everywhere for the best resolution
and minimum unit to unit variability. • CAT Coupling Capacitors are made to
our specifications and are better than any other audiophile grade capacitor. CAT
Audio Wire uses ultra pure, soft annealled copper and super low loss insulation.
jacks for superior connection. Silver Solder used for best electrical
connection. Custom Designed Hermetically Sealed Switches.
Panel Muting Switch.
Automatic Mute at turn on and turn off.
Front Panel Switch eliminates the non-linear load of the turned off tape deck
when in Normal and provides uncompromised recording quality when in Record.
Extra Set of Main Output jacks for special audiophile setups. • LOAD Jack
allows changing MC cartridge loading while listening to music.
CD and A/V Volume Control Tapers available.
STAGE IS OPTIONAL)
(@lkHz): Line 26 dB, Phono 47 dB
phono input sensitivity: 0.12 my
Tracking: Line.05 dB, Phono.05 dB
We suggest .25 and higher, please keep in mind that the lower the output the
quieter your tubes should be.
Response: Line 0.1Hz to 600kHz +0,-3 dB (rise time 0.6 usec) Phono
RIAA 20Hz to 20kHz +/- 0.1dB
Distortion (@ 1 volt): Line < .0005%, Phono < .001% Slew Rate: Line 15
volts/usec, Phono 10 volts/usec
Output (@1 kHz): Line 50 volts rms, Phono 50 volts rms Input Overload: Line 100
volts rms, Phono 250 my rms @ 1 kHz Noise: Line 112 dBA below 2 volt output
96 dBA below 10 my input
Line greater than 90 dB, Phono greater than 90 dB Input Impedance: Line 50 kohms,
47.5 kohms, 180 pf (user adjustable) Output Impedance: 100 ohms
Load: Line: under 4000 pf, over 5000 ohms
Main Chassis - 19.0" x 5.24" x 12.2" Power Supply -
12.2" x 4.0" x 6.0"
Requirements: 120v, 60Hz, 80 watts (export
Net 641bs., Ship 701bs.