LDR3.V2K Passive Preamp Kit

$795.00

The V2 version of this kit is no longer available. It has been updated to the V25 version which uses the V25 Preamp Controller that was released in Q2 2017.


The LDR3.V2K is a complete 3 input, 2 output single-ended passive preamp kit. The kit is substantially identical to the LDR3.V2 Passive Preamp.

The kit includes all the parts needed to assemble a complete audiophile grade passive preamp including enclosure, front/rear panels, dual visual displays, RCA jacks, power supply, manual encoder/knob, remote, wire etc

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Comprehensive Passive Preamp Kit

The LDR3.V2K is an affordable comprehensive 3 input, 2 ouput single-ended passive preamp kit that includes all the parts needed to assemble a complete audiophile grade passive preamp including enclosure, RCA jacks, power supply, remote etc. The kit is substantially identical to the finished LDR3.V2 Passive Preamp.

State of The Art LDR Based Technology

The kit is designed around Tortuga Audio’s latest version of the  LDR3x Passive Preamp Controller Board – the V2.1This is the same core board that Tortuga Audio is using in all of its LDR passive preamp products.

High Quality Enclosure

The kit uses the same high quality uni-body extruded aluminum box used in Tortuga Audio’s current LDR3.V2 and LDR1B.V2 finished preamps. The front panel is 0.25″ thick smoke gray see-through acrylic behind which you mount either the dual display modules. The rear is a brushed anodized aluminum panel with milled openings for all audio and power connections including the RCA jacks and a USB connection for firmware updates.

Ready To Use Circuit Boards

The circuit boards in this kit come already fully assembled and tested. You do not need to solder individual components into circuit boards. Assembly and point to point wiring is all that is required.

Included In Kit

QuantityStandard Items
1LDR3x.V2.1 Passive Preamp Controller Board
12.95" x 6" x 8" black powder coated extruded aluminum enclosure box
1 0.25" x 2.95" x 6" see-through dark acrylic front panel with hole/recess for encoder and knob
1 0.08-0.10" x 2.95" x 6" black anodized rear panel with cut-outs for jacks, etc.
1knurled black enameled Fender Telecaster style encoder control knob
4peel'n'stick urethane rubber feet
10standard gold plated brass RCA jacks
1DC power jack
112 VDC Trigger Out phono jack
8sets of socket head black oxide sheet metal screws with washers (for front/rear panel)
1external "wall-wart" or "brick" style external 12VDC power supply suitable for 120 or 240 VAC
13 input relay switching board - IO3
1ribbon cable for connecting the input relay board to the LDR3x board.
14 conductor cable for connecting the encoder to the display module
1ribbon cable for connecting the display module to the LDR3x board
1rotary encoder module with nut and washer
1master display board
1slave display board
1display module mounting bar - plastic angle
4sets of nylon threaded rods with nuts & washers for the master display module mounting bar
1ribbon cable for connecting master display module to slave module
1USB cable for connecting between the LDR3x board and the rear panel
10feet of white #24-26 gauge silver coated copper wire (audio hookup)
1foot of red #20 gauge silver coated copper wire (power hookup)
1foot of red #26 gauge silver coated copper wire (trigger hookup)
1foot of black #20 gauge silver coated copper wire (power hookup)
1foot of black #26 gauge silver coated copper wire (trigger hookup)
3foot of green #20 gauge silver coated copper wire ( audio ground hookup)
10.060" x 5.7" x 8"  FRP mounting board
6#4 threaded hex stand-offs for mounting the LDR3x, input board and ground bar to mounting sheet
12#4 screws for the mounting standoffs
2#4 screws for the mounting display bar to board
2#4 nuts for mounting display bar to board
1Apple remote
1IR Receiver module - to be soldered into the display module
Optional Items
10Cardas RCA jacks
10feet of Neotech 26AWG UP-OCC Solid Copper wire

Things You Really Need – Not Included In Kit

  • Solder
  • Soldering iron
  • Allan wrench for socket head screws
  • Drill & drill bit for drilling holes in the mounting sheet and mounting bar.
  • Wire strippers for stripping insulation off wires
  • Wire cutters for cutting wires to length
  • Small screw drivers (both regular and phillips) for screw terminals, encoder knob etc.

Things You Really Should Have But Can Probably Get Away Without

  • A volt-ohm multimeter

Assembly Instructions

Presently we only have rudimentary assembly instructions that can be found in our online documentation page. In the future we plan on having more detailed instructions with both photographs and video.

We strongly encourage you to review the available assembly instructions and decide for yourself if you are comfortable taking on this kit given the current level of assembly instructions.

Optional Items

  • RCA Jacks
    • Upgrade to Cardas RCA jacks
  • Power Supply
    • 120 VAC (domestic) – 12 VDC 0.5 amp linear regulated external “wall-wart” style power supply – 2.1mm pin (positive)
    •  240 VAC (international) – 12 VDC 1.0 amp switching power supply “brick” with detachable IEC power cord with US AC plug – 2.1mm pin (positive)
  • Hookup Wire – Neotech 26AWG UP-OCC Solid Copper
Display Colors

Blue, Yellow, Green, Red

AC Power

120 VAC (US domestic), 240 VAC (international)