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Some photos (click photo for a larger view):

 preamp.jpg (51166 bytes)

Front View

Preamp2.jpg (57907 bytes)

Back View


Much of the above documentation is in Adobe's PDF format.  You can get a free copy of the Acrobat Reader here:

K12 Preamp

The A and T Labs preamp was designed to achieve several key goals:

  • Clean, long life, reliable source switching
  • Electronically controlled, non-deteriorating volume control 
  • Impeccable sonic performance and low noise and cross talk

To achieve them, the preamp incorporates these features:

  • 8 inputs MM phono, Tuner, CD1, CD2, Tape1, Tape2, Aux1, Aux2
  • 4 record outputs with monitor select for CD2, Tape1, Tape2, Aux1
  • Gold dual contact sealed relay source selection
  • Front panel headphone output
  • Front panel 1/8th inch appearance of Aux1, for an IPOD or similar device
  • Optical encoder volume/balance control
  • PIC microprocessor control
  • Bypass-able bass and treble controls
  • Mute
  • 2 sets of controlled outputs to amplifiers
  • Ground plane main/audio PCB for low noise and crosstalk 
  • 2 power switched 5 volt outputs to drive relay controlled power strips for system components

The following are available from A and T Labs:

  • Printed circuit boards for main board, control board, and LED display board

  • Programmed micro-controller

FAX (or mail) your order, using our FAX Order Sheet


Ordering Information

Click to enlarge Item Description Weight Price

MainPCB.jpg (67430 bytes)

K12PCB1 Main printed circuit board 2 oz. $69

ControlPCB.jpg (39647 bytes)

K12PCB3 Control printed circuit board 16 oz. $15
LEDPCB.jpg (29668 bytes) K12PCB2 LED display printed circuit board 2 oz. $11
  K12PIC Programmed PIC microcontroller 1 oz. $15

Ordering Information



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Last modified: July 19, 2010