M-101 Dual Discrete Phono / Line Preamp

The M-101 is a flexible and high-quality preamp module offering dual phono stages, selectable input options, and customizable gain settings. Below is a detailed guide for its operation.

Input Selection: Phono or Line

The M-101 provides a "Phono" button for switching between the phono and line input sources:

1. Phono Input:

   • Activated when the Phono button is lit.

   • Signal is sourced directly from the stereo phono socket on the PCB instead of via the 16 pins connector.

   • The M-101 module has a stereo phono socket on the PCB:

     • For all Rodec products, like MX Modular, Bunk, and future housings, RCA connectors and cables for the stereo phono socket are pre-installed. Simply connect the provided cable to the M-101 PCB's socket as shown in the pictures below (Phono Socket fig 1 &2).

     • For custom housings, a separate connector cable can be purchased from our website.

1. Line Input:

   • Activated when the Phono button is unlit.

   • Signal is sourced from the line input on the 16 pins audio input (see 100 series specification for pin layout). In Rodec Housings, all wiring is pre-installed.

Phono Stages: Two Distinct Options

The M-101 offers two selectable phono stages for different sonic characteristics:

1. MX180 Stage:

   • Recreates the classic Rodec party sound with a dynamic and lively tone.

   • Press the MX180 button to activate this stage.

   • Lit MX180 Button: MX180 phono stage is active.

2. Discrete Stage:

   • A new Rodec-engineered discrete phono stage for a deeper and more relaxed sound.

   • Unlit MX180 Button: Discrete phono stage is active.

Gain Control

• The Gain Knob allows for precise level adjustments:

  • Adjustable from 0 dB (attenuator only) to +20 dB of gain.

  • Default factory setting is +20 dB max gain.

Adjusting Maximum Gain via PCB Dip Switches

The M-101 includes two dip switches on the PCB to customize the maximum gain:

• Factory Setting: Dip switches set to +20 dB max gain (ON).

• Alternate Setting: Flip the dip switches to set the max gain to 0 dB for unity gain or attenuation-only operation.