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Pass Laboratories

X-2 Owner's Manual

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Summary of Contents for X-2

Page 1: ...Pass Laboratories X 2 Owner s Manual Serial Number ...

Page 2: ...e Mosfet power transistor operated in common source mode One such circuit amplifies each signal polarity of a balanced input signal and their operation is inter coupled to allow optimal operation with both balanced and unbalanced input signals while providing balanced and unbalanced outputs The gain stage uses an ultra matched pair of power Mosfets biased by a single constant current source The si...

Page 3: ...For unbalanced operation on the first input a shorting plug is provided between pins 1 and 3 shorting the negative input to ground and providing the lowest possible noise Except for a small difference in noise there is no significant difference in performance between using the shorting plug or not The unbalanced input impedance of the preamplifier is a nominal 10 kOhms In balanced mode the input i...

Page 4: ...they have an excellent transfer curve for an asymmetric Class A design The gain Mosfets are rated at 32 watts each and peak currents in excess of 5 amps Needless to say they do not work very hard when sourcing 30 milliamps into a load The use of such devices does provide very high transconductance and charge surface area over small gain devices and this shows in the excellent linearity obtained wi...

Page 5: ...ists of a two toroidal power transformers delivering an unregulated 160 volts which is actively regulated for each channel before feeding passive filtering By the time the voltage reaches the circuit it has become 100 volts and 30 volts with noise figures on the order of 20 microvolts This noise is then differentially rejected by the balanced topology of the circuitry The 100 volts is available fo...

Page 6: ... Output Impedance 1000 ohms each output polarity Input Impedance 10 kOhm unbalanced 20 kOhm balanced CMRR less than 50 dB 20 20 KHz typically less than 67 dB 1 KHz Crosstalk less than 60 dB 20 20 KHz Typically less than 80 dB 1 KHz Output Noise 80 microvolts rms 20 20 KHz band unweighted Power Consumption 30 watts Dimensions 17 W x 11 5 D x 3 5 H Shipping Weight 35 lb PASS Pass Laboratories PO Box...

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