Pass Laboratories Aleph 0 Owner'S Manual Download

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Performance Specifications

Gain

20 dB balanced

19.9 dB unbalanced
25.5 dB unablanced jumper XLR pins 1 and 3

Freq. Response

0 dB @ DC -3 dB at 100 KHz

Power Output

75 watts

@ 8 ohms 20 Hz - 20 KHz

Distortion

< 1% @ 75W, 8 ohms, 20 Hz - 20 KHz

Output Impedance

.01 ohm

Input Impedance

25 Kohm, differential (XLR)

10 Kohm, single-ended (RCA)

Common mode rejection

60 dB

Output Noise

600 microvolts

DC offset

less than 100 mV after warm-up

Power Consumption

300 watts at 75 watts output

Operating Temperature

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 Laboratories

21555 Limestone Way

Foresthill CA 95631

tel

(916) 367 3690

fax

(916) 367 2193

Summary of Contents for Aleph 0

Page 1: ...Pass Laboratories Aleph 0 Owner s Manual ...

Page 2: ... Class A circuits to preamps and input stages I feel that in specialized and demanding applications the energy penalty is worth the purity of performance obtainable from single ended Class A operation This purity delivers the most musicality and listening satisfaction per watt of any operating mode Over the years I have remained fascinated by the characteristic sound of the single ended topology b...

Page 3: ...jumper can be used between pins 1 and 3 on the XLR which terminates the pin 3 negative input to ground When running unbalanced input use of this plug will increase the amplifier s gain to 26 dB in the event that you need or prefer higher gain than the standard 20 dB figure If you don t need that extra gain our own preference is to not use the shorting plug If you insert the copper shorting jumper ...

Page 4: ... with the same specs sounded the same We have heard Triodes Pentodes Bipolar VFET Mosfet TFET valves IGBT Hybrids THD distortion IM distortion TIM distortion phase distortion quantization feedback 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 ...

Page 5: ...s in series with the signal path the better This often true even if adding just one more gain stage will improve the measured specs 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 differen...

Page 6: ...serves as a natural benchmark Virtually all the amplifiers on the market are based on a push pull symmetry model The push pull symmetry topology has no particular basis in nature Is it valid to use air s characteristic as a model for designing an amplifier If you accept that all processing leaves its signature on the music the answer is yes One of the most interesting characteristics of air is its...

Page 7: ...amplifier alternates operation with a minus side Each side of a push pull amplifier handles the audio signal alternately the plus side supplying positive voltage and current to the loudspeaker and the minus side supplying negative voltage and current Problems with push pull amplifier designs associated with crossover distortion have been discussed elsewhere at length and one of the primary results...

Page 8: ...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 Beyond the single ended bias point it will operate as a push pull amplifier in the conventional sense leaving Class A at twice the bias point or about 120 watts peak into 8 ohms A very important consideration in attem...

Page 9: ...at small fractions typically 20 of their ratings For extended life we do not allow chip temperatures to exceed 80 degrees C Regardless of the type of gain device in systems where the utmost in natural reproduction is the goal simple single ended Class A circuits are the topologies of choice While it will not leave Class A on an unclipped positive signal a single ended Class A design would ordinari...

Page 10: ...any environment the amplifier is equipped with balanced inputs featuring a common mode noise rejection of greater than 60 dB Balanced operation is accomplished through a passive network tied directly into the input stage of the amplifier not with additional active input circuitry as in other products This assures that the noise benefits of balanced operation are not accompanied by the degradation ...

Page 11: ...ance 01 ohm Input Impedance 25 Kohm differential XLR 10 Kohm single ended RCA Common mode rejection 60 dB Output Noise 600 microvolts DC offset less than 100 mV after warm up Power Consumption 300 watts at 75 watts output Operating Temperature 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...

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