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Summary of Contents for Pass Laboratories Aleph 0
- Page 1 Pass Laboratories Aleph 0 Owner's Manual...
- Page 2 Introduction The Aleph 0 is a single ended Class A audio power amplifier, the first product 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.
- Page 3 Setup The amplifier has three sets of connections and one switch: The first connection and switch is the AC line power system. The amplifier's voltage and current rating are indicated on the bottom. It will be either 240 volts, 120 volts, or 100 volts, all with a 6 amp 3AG type fuse. The frequency rating of the AC line source is 50 to 60 Hz.
- Page 4 This amplifier runs hot. The heat sinks will warm up in about an hour to a temperature which will not be comfortable to touch for more than a moment or two, which is 120 to 130 degrees Fahrenheit (50 to 55 degrees Celsius). This is normal, and there is a thermal shut off system which will shut down the amplifier at internal temperatures in excess of 160 deg.
- Page 5 For a long time there has been faith in the technical community that eventually some objective analysis would reconcile critical listener's subjective experience with laboratory measurement. Perhaps this will occur, but in the meantime, audiophiles largely reject bench specifications as an indicator of audio quality.
- Page 6 Typically the levels involved in most critical listening are only a few watts, but an amplifier biased for ten times that amount will generally sound better than one biased for the few watts. For this reason, designs which operate in what has been referred to as "pure" Class A are preferred because their bias currents are much larger than the signal most of the time.
- Page 7 Fig. 1 shows the single ended nature of air. We can push on it and raise the pressure an arbitrary amount, but we cannot pull on it. We can only let it relax and fill a space as it will; the pressure will never go below "0".
- Page 8 “Class A” amplifiers on the market, you might say I opened a Pandora’s box. Until the output current reaches the single ended bias point of the Aleph 0, it is considered a single ended Class A amplifier as the bias is provided by a current source attached to the negative power supply.
- Page 9 Mosfets provide the widest bandwidth of solid state power devices, however they were not chosen for this reason. The design of the Aleph 0 does not seek to maximize the amplifier bandwidth as such. The capacitances of the Mosfets provide a natural rolloff in conjunction...
- Page 10 150 Joules. This unregulated supply feeds the output transistors only with a full power ripple of about .25 volt. The chassis of the Aleph 0 is made entirely of machined aluminum; no sheet metal is employed. We mill the chassis components ourselves from aluminum stock on four computer controlled vertical milling machines.
- Page 11 50 degrees C. Warm up time 1 hour minimum Dimensions 12 " W x 12 " D x 10.5" H Shipping Weight 68 lb. PASS PASS Pass Laboratories 21555 Limestone Way Foresthill CA 95631 (916) 367 3690 (916) 367 2193...