LDR1B.V2K Balanced Passive Preamp Kit


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 LDR1B.V2K is a complete single input balanced passive preamp kit. The kit is substantially identical to the LDR1.V2B Balanced Passive Preamp  which is a passive (unity gain) single input, dual output  preamp/volume controller for balanced audio.

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

SKU: LDR1B.V2K Category: Tag:
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Comprehensive Balanced Passive Preamp Kit

The LDR1B.V2K is an affordable comprehensive single input passive preamp kit for balanced audio that includes all the parts needed to assemble a complete balanced passive preamp including enclosure, XLR jacks, power supply, remote etc. The kit is substantially identical to the LDR1B.V2 Balanced 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 XLR jacks and a USB connection for firmware updates.

Included In Kit

Quantity Standard Items
2 LDR3x.V2.1 Passive Preamp Controller Boards
1 2.95″ 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″ anodized rear panel with cut-outs for jacks, etc.
1 knurled black enameled Fender Telecaster style encoder control knob
4 peel’n’stick urethane rubber feet
6 Neutrik XLR jacks (1 pair female, 2 pair male)
1 12 VDC power jack – 2.5mm barrel, 2.1mm center pin
1 12 VDC Trigger Out phono jack
8 sets of socket head black oxide sheet metal screws with washers (for front/rear panel)
1 “wall-wart” style external 0.5A power supply suitable for 120 or 240 VAC
1 ribbon cable for connecting the encoder to the display module
1 ribbon cable for connecting the display module to the LDR3x board
1 rotary encoder module with nut and washer
2 display boards (master & slave) – fully assembled – with master to slave ribbon cable
1 display modules mounting bar – plastic angle
4 sets of nylon threaded rods with nuts & washers for attaching display modules to mounting bar
2 sets of screws with nuts for attaching the mounting bar to the mounting board
2 USB cables for connecting between the LDR3x boards and the rear panel
10 feet of white #24-26 gauge silver coated copper audio hookup wire
1 foot of red #24-26 gauge silver coated copper wire (power hookup)
1 foot of black #24-26 gauge silver coated copper wire (power hookup)
1 0.060″ x 5.7″ x 8″  FRP mounting board
10 #4 threaded hex stand-offs for mounting the LDR3x boards and star ground bar to the mounting board
18 #4 screws for the mounting standoffs
1 Apple remote
1 IR Receiver module – to be soldered into the master display module

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

Available Options

  • 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

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