Product Documentation

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7.1.LDR3.V25K Kit Overview

Get Familiar With Your Kit

Before proceeding with actual detailed assembly, we strongly encourage you to read all of information below.

LDR3.V25K kit internal assembly

Check Your Parts List

Every kit should include a parts list that was used by Tortuga Audio to make sure we included all the parts in your kit shipment.

If you haven’t already done so, we encourage you to go through that checklist to make sure you can find and identify all the parts/wiring. If you believe we left something out please contact us and we’ll be happy to ship you the missing item(s).

Key Sub-Assemblies

Your kit is actually a fairly straight forward build since all the circuit boards come fully populated and tested. Most of the work involves mechanical assembly followed by some wiring. The wiring is probably the most complex part but if you move deliberately through the instructions it should all be clear.

The kit is composed of the following sub-assemblies:

  1. The V25 Controller Board with integrated input switching
  2. The display assembly and its mounting bracket
  3. The mounting board to which items 1) and 2) are to be mounted
  4. The rear panel including the RCA jacks, power jack, trigger jack, and USB jack.
  5. While not an assembly as such, the enclosure box and front panel

The Mounting Board

The Mounting Board is a 5.73″ x 8″ epoxy fiber board make of the same material as a typical printed circuit board. The Mounting board slides into the bottom grove of the Enclosure Box.

The Mounting board comes with 8 pre-drilled holes as shown below (except yours doesn’t have the writing on it). Note the hole patterns to orient the top and front of the mounting board.

Three items get mounted on the Mounting Board: 1) The Display Bracket holding the Display Modules; 2) The Controller Board; and, 3) The Star Ground.

LDR3.V2K kit mounting board

Enclosure Box

The Enclosure Box (the “Enclosure”)  is a robust extruded aluminum box that is 3″ tall by 6″ wide by 8″ deep. It is powder coated with a flat black finish. The Enclosure has a series of internal slots on the sides into which you can slide the Mounting Board. The Mounting Board must use the bottom most pair of slots.

LDR3.V2k enclosure box

Enclosure Feet

Four (4) peel-and-stick black urethane feet are provided that are to be mounted on the underside of the Enclosure approximately 1 – 1.5 inches in from each corner. Once in place these have excellent long term adhesion and will be difficult to remove and move so be careful when attaching them.
Tortuga Audio enclosue feet

Fasteners & Display Bracket

The collection of kit fasteners and brackets are shown below followed by a brief description of each.

Display Bracket

The Display Bracket is a gray plastic L-bracket with 6 pre-drilled holes. The leg of the bracket with 2 holes is used to mount the Display Bracket to the Mounting Board. The remaining 4 holes in the other leg are for attaching the Display Modules to the Display Bracket.

Display Bracket Fasteners

There are 2 zinc coated screws with nuts that are used to attach the Display Bracket to the Mounting Board.

Display Nylon Fasteners

The white nylon fasteners are used to attach the 2 Display Modules to the Display Bracket. There are four (4) threaded rods, 8 main nuts, and 4 spacers. In some cases we may substitute 4 additional nuts in lieu of the spacers.

Panel Screws

There are eight (8) panel screws with washers. These are black socket head sheet metal screws. These are used to attach both the front and rear panels to the enclosure.


There are six (6) aluminum standoffs along with twelve (12) zinc coated standoff screws. The standoffs are used to mount the Controller Board to the Mounting Board and to make the Star Ground.

Front Panel & Encoder Knob

The front panel is a heavily tinted clear acrylic 1/4″ thick panel. When the preamp is turned off the dark acrylic panel significantly limits your ability to see the internal components and for all practical purposes looks like a black panel. When the preamp is turned on the numerals from the two Display Modules are clearly visible while everything else still remains unseen.

The front panel attaches to the Enclosure via 4 socket head screws. There is hole and recess in the front panel through which the Encoder is mounted (Encoder not shown in pic below). The black knurled Fender Telecaster control Knob mounts on to the Encoder as the final assembly step.

LDR3.V2K kit front panel with knob

Rear Panel

The rear panel is a black anodized aluminum panel as shown below. It accommodates 10 RCA jacks (6 inputs, 4 outputs), the USB cable, the 12 VDC power input jack and the 12 V Trigger jack.’

The rear panel connects to the Enclosure via 4 socket head screws with washers.

LDR3.V2 rear panel

RCA Jacks

The kit includes 10 standard RCA jacks as shown below. You may have opted for the Cardas upgrade (not shown here).

standard RCA jacks

Power & Trigger Jacks

The power jack is a 5.5 mm style barrel jack with a 2.1 mm pin. It accepts the barrel plug from the external “wall wart” style 12 VDC power supply provided with the kit. The 12 V trigger jack is a mono 3.5 mm phone jack that provides a 12 VDC signal whenever the preamp is turned on.

Both of these jacks are mounted in the Rear Panel.

Tortuga Audio power & trigger jacks

Internal USB Cable

The Internal USB Cable is provided solely to enable updating of the preamp’s firmware which is done via a USB connection to a PC. This 12 inch cable is mounted internally on the Rear Panel and connects to the J8 header on the Controller Board.

Type A USB port with cable

Wire & External USB Cable

The last part of the kit includes a bag with various wires plus an external USB cable. Like the Internal USB Cable, the external cable is for connecting the preamp to a PC for purposes of updating the firmware.

While there’s no hard and fast rules when it comes to using the wire provided you will find that color/lengths of wire provided will make most sense if your use white wire for audio signal hookup, the red and black wire for power and the green wire for ground connections.

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