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ePot.V4 bundle

$523
V4 board with LDR module installed
OLED display assembly front view with cabling and encoder
quad ldr module2 - side view
Apple remote alternative | the "Function" remote

The V4 bundle combines a V4 electronic stepped-attenuator and preamp controller board together with its companion OLED display module, rotary manual encoder, and infrared remote, all for a 15% discount over purchasing these individually. 

Everything we offer by way of the V4 system is included in the bundle. However, please be aware that the V4 bundle is NOT in any way a complete turnkey preamp kit. 

Items included in the bundle are also sold individually. 

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ePot.V4 attenuator & preamp controller

$289
V4 board with LDR module installed
V4 preamp controller LDR module install diagram
quad ldr module2 - side view
V4 preamp board with solid state buffer module - back end view
V4 preamp board with solid state buffer module - front end view
V4 preamp board with solid state buffer module - right side view

The ePot.V4 is Tortuga Audio’s 5th generation LDR preamp controller — the result of over 15 years of developing an alternative to conventional volume control for DIY audio enthusiasts and audio OEMs.

The V4 is a complete platform for building a full-featured, remote-controlled preamplifier — passive by default, or active with the optional SSBM.V4 buffer board. A high-contrast OLED display provides real-time feedback for volume, balance, input selection, and system status.

Volume is controlled entirely by light dependent resistors (LDRs). No mechanical potentiometers. No stepped attenuators. No mechanical contacts in the signal path.

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SSBM.V4 solid state buffer module

$224
ePotPi.V4 Rev B buffer board prototype pcb
solid state buffer module - without LDR mdoule
V4 preamp board with solid state buffer module - right side view

The SSBM.V4 is an optional buffer board that plugs directly into the ePot.V4, turning it from a passive attenuator into an active preamp.

A buffer acts as a high-impedance firewall between your volume control and amplifier. It doesn’t make audio louder — it’s a current amplifier, not a voltage amplifier. What it does is preserve the energy and dynamics of the original recording, especially when driving longer cable runs or lower-impedance amplifier inputs.

The SSBM.V4 is direct-coupled with high input impedance, low output impedance, and adjustable gain defaulting to unity. For best performance, pair it with a higher quality 5V linear power supply.

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OLED display assembly

$175
OLED display assembly front view with cabling and encoder
OLED display assembly with encoder attached
EastRising OLED display dimensions

A 256 x 64 pixel, high-contrast white-on-black graphic OLED display designed for use with Tortuga Audio preamp controllers and finished preamps.

The display provides an intuitive, menu-driven control interface built around a 7-button Apple or compatible remote. Volume, balance, input selection, and system settings are all managed through clear on-screen menus.

The assembly includes a custom adapter board with an installed infrared receiver, an encoder header, and all cabling. Fully tested and ready to connect — no assembly required.

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Quad LDR module

$49
quad ldr module2 - top view
quad ldr module2 - side view
quad ldr module 2 - end view

A quad LDR module with two pairs of LDRs — one pair per audio channel, each forming a voltage divider for volume control. One module provides full two-channel stereo attenuation.

Required for all V3 and V4 series controllers. Typically purchased as part of the ePot.V4 Complete System but available separately as a replacement.

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Single LDR module

$19
LDR Module

A single plug-in LDR module for the V2 and V25 series preamp controllers. Two modules per channel form a voltage divider for volume control — four modules total for stereo.

The LDRV2 is available here as a replacement part for existing V2 and V25 owners.

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Function remote control

$40
Apple remote alternative | the "Function" remote

The Function remote replaces the silver Apple remote, which is no longer in production. It’s an infrared remote that works with all V4 series controllers and preamps.

Well-constructed with a quality feel, responsive button action, and a simple layout that maps directly to the V4’s menu-driven interface. 

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Encoder module

$19
Tortuga Audio encoder with cable
Tortuga Audio encoder - top view
Tortuga Audio encoder - bottom view

A rotary encoder with integral push button, mounted on a small PCB with a 4-pin header and cable that connects directly to the OLED display adapter board.

The encoder is included with the OLED display assembly but is also available separately as a replacement part.

The encoder provides hands-on manual control of volume, power, mute, channel balance, and input selection. For full control functionality, pair it with the infrared remote.

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Encoder module

$19
Tortuga Audio encoder with cable
Tortuga Audio encoder - top view
Tortuga Audio encoder - bottom view

A rotary encoder with integral push button, mounted on a small PCB with a 4-pin header and cable that connects directly to the OLED display adapter board.

The encoder is included with the OLED display assembly but is also available separately as a replacement part.

The encoder provides hands-on manual control of volume, power, mute, channel balance, and input selection. For full control functionality, pair it with the infrared remote.

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Under Construction graphic

We are currently working on offering an updated finished preamp product and perhaps also a complementary tube buffer. When these future products become available, you’ll find them here.