Advertisement
Quick Links
Advertisement
Related Manuals for Pass Laboratories Aleph P
Summary of Contents for Pass Laboratories Aleph P
- Page 1 Pass Laboratories Aleph P Owner's Manual...
- Page 2 Introduction The Aleph P is a single ended Class A audio preamplifier, the first produced by Pass Laboratories. It combines completely new design thought applied to a traditional topology and the experience of twenty five years of amplifier design. This manual applies to the second version of the Aleph P, which incorporated circuit improvements and remote control operation.
- Page 3 Setup The preamplifier has four sets of input connections, two sets of output connections, an input selector and three level controls. Optionally, it also has a remote control. It also has an AC line power connection. The amplifier's voltage and current rating are indicated on the rear.
- Page 4 The operation of the front panel input selector is straight forward. The selected input is indicated by a blue LED above the knob, and the selection can be moved by rotating the knob. The knob is attached to an optical encoder indicating the direction of rotation to the microcontroller which drives the input relay switches.
- Page 5 If you have a concern that the output impedance may be too high to properly drive the capacitance of a cable, keep in mind that that 1000 ohms still will allow bandwidth to 160 kHz into 1000 pF of capacitance. The maximum output impedance only occurs at the volume control maximum, and quickly goes to a low figure below the maximum level position.
- Page 6 nested feedback, no feedback, feed forward, Stasis, harmonic time alignment, high slew, Class AB, Class A, Pure Class A, Class AA, Class A/AB, Class D, Class H, Constant bias, dynamic bias, optical bias, Real Life Bias, Sustained Plateau Bias, big supplies, smart supplies, regulated supplies, separate supplies, switching supplies, dynamic headroom, high current, balanced inputs and balanced outputs.
- Page 7 2) The characteristic of gain devices and their specific use is important. Individual variations in performance between like devices is important, as are differences in topological usage. All signal bearing devices contribute to the degradation, but there are some different characteristics are worth attention.
- Page 8 Mosfets provide the widest bandwidth of solid state power devices, however they were not chosen for this reason. The design of the Aleph P does not seek to maximize the preamplifier bandwidth as such. The capacitances of the Mosfets provide a natural rolloff in conjunction with the resistive impedances found in the circuit, and the simplicity of the circuit allows for what is largely a single pole rolloff characteristic.
- Page 9 The preamplifier is designed to run constantly, and will exhibit optimum performance within an hour of turn-on. The chassis of the Aleph p is made entirely of machined aluminum. We mill and engrave the chassis components from solid aluminum material on computer controlled vertical milling machines.
-
Page 10: Specifications
Noise floor < -120 dBV, 20-20 KHz Power Consumption 25 watts Dimensions 19 " W x 11.5 “ D x 4" H Shipping Weight 35 lb. PASS PASS Pass Laboratories PO Box 219 24449 Foresthill Rd. Foresthill CA 95631 (916) 367 3690 (916) 367 2193...