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SLP-03
Classic Cary Audio
Vacuum Tube Preamplifier
The new Cary Audio Design SLP-03
preamplifier is a blend of digital computer technology and pure vacuum tube, analog discrete
circuitry. The SLP-03 consists of actually four (4) analog, 18 dB, line gain stages.
Two separate gain stages are used for each of the two channels. One gain stage amplifies the positive phase (+180 degree) and the other gain stage amplifies the negative phase (-180 degree). Two stages for each channel equal the four active line circuits. All audio path signals are amplified through 12AU7 vacuum tubes in a class A zero feedback circuit.
The front panel display is a Noritake vacuum florescent display with a blue lens in front.
The display receives and displays the critical control functions from a Motorola CPU incorporated inside the Cary Audio SLP-03 preamplifier. The Motorola processor is the controller for all functions of the preamplifier.
Back to the analog side of things, there are a total of eight (8) fully regulated power supplies
in the SLP-03 preamplifier.
Separate supplies for each channel's analog circuit along with multiple power supplies for the Alphanumeric, Noritake display, along with dual supplies for the Motorola processor. To power the fully regulated power supplies the SLP-03 has two individual R-Core shielded power transformers. The dual power transformers along with separate left and right supplies makes the SLP-03 a true dual mono preamplifier. In fact the channel separation is in excess of 80 dB. This amount of channel independence is a major engineering design break through in vacuum tune designs.
A word about cinema-bypass is in order. We have discovered with previous Cary Audio
preamplifier designs incorporating the cinema-bypass, that on occasion the user would forget that the
system surround processor inputting to the preamp could be a very high level. Thus when the
preamplifier power switch is placed in the off position, the default would be a feed through of the
processor signal and could blast the left and right channel loudspeakers. In the SLP-03 the
cinema-bypass only functions when the SLP-03 is powered up with the volume gain setting set at number 47
on the display.
The reading of 47 is unity gain. It might be noted in the SLP-03 one could have a single ended (RCA) processor input and through the SLP-03 have a balanced output to the left and right channel amplifiers.
Operating the dual 12AU7 vacuum tubes in a current source configuration, true balanced output is
achieved with both single-ended (RCA) inputs or the balanced (XLR) input selection.
Considering
the massive power transformers along with the multiple regulated supplies the SLP-03 will offer the
ultimate sound reproduction when left on continuously 24/7. Tube life should be on the order of
three years in the continuous duty mode.
The SLP 03, when combined with a solid state or vacuum
tube power amplifier is capable of bringing outstanding musical reproduction into your home. The
selected pair of dual triode 12AU7's vacuum tubes per channel offers true balanced vacuum tube warmth
and realism. Convenience meets sound quality plus great industrial design in the Classic Series SLP 03
preamplifier.
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Questions?
1.973.239.1799
