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Welcome – Cary Audio Design SLP 05 User Manual

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WELCOME

CIRCUITRY

The SLP 05 is a no compromise line stage and headphone amp. The power supply is vacuum

tube rectified and has a 5AR4 vacuum tube rectifier lying on its side inside the unit. The 5AR4

tube has a separate cathode from the filament so any position of mounting is proper. It was

horizontally mounted to keep the power supply the same height as the preamplifier. The

rectifier tube provides the high-voltage (B+) plate voltage. Two separate filter chokes and a fully

regulated shunt coupling capacitor ensure stable and ripple-free voltage resulting in a very low

noise and spacious sound stage.

The preamplifier has eight (8) 6SN7 dual triodes octal socket vacuum tubes. Four (4) of the

6SN7's act as the true balanced main line section. Two (2) of the 6SN7's are operating in the

front end ahead of the gain stage as balanced plus/minus 180 degree input buffer stage. The

remaining two (2) 6SN7's function as a ‘Class A’ push-pull zero feedback headphone amplifier.

This headphone section amplifier has two on board output transformers to transform the high

impedance of the 6SN7's to low impedance for driving the headphones.

There are two power switches to control the AC input voltage to the preamplifier. The large

knob on the power supply is the mains power switch. If one places the power supply in another

location, the main power switch is turned on. A blue LED in the knob indicates the power

supply can be activated by the preamplifier section. Turning the preamplifier power switch

sends 12 volts DC to the power supply relay to turn on the main power transformer that powers

the tube rectification along with all other voltages required to place the SLP 05 in operation.

The two meters on the front of the power supply indicate the B+ plate voltage (210 VDC) along

with the plate current (60 ma.). You will always know at a glance if all is OK with the operating

conditions.

The SLP 05 is engineered and built to provide a lifetime of musical enjoyment with facilities

and features that ensure future compatibility and audiophile performance for many years to

come. This preamplifier is a future collector’s item and deserves to be installed with the finest

ancillary equipment available, such as the CD 306 SACD Pro disc player or the CAD 211FE

power amplifiers.


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