Backert Labs Optik Phono 1.1 - Phono Preamplifier for Optical Cartridges

Backert Labs has unveiled the Optik Phono 1.1 phono preamplifier, designed specifically for use with optical cartridges from the Japanese company DS Audio. The manufacturer emphasizes that the new model is distinguished by maximum flexibility and a no-compromise design. Built around two 12AU7 vacuum tubes, the phono preamplifier features two independent inputs for optical cartridges – a solution implemented for the first time in components of this type.

This design allows instant switching between two DS Audio cartridges using the controls on the front panel – for example, between stereo and mono cartridges or between two different stereo cartridges – without the need to reconnect cables or use multiple phono stages. For serious turntables equipped with multiple tonearms, this is a convenient, albeit premium, solution that further underlines just how niche and uncompromising the DS Audio ecosystem has become.

It is worth recalling that DS Audio cartridges must operate with a dedicated optical phono preamplifier (often referred to as an “energizer”), which supplies power to the cartridge’s LED and applies the correct equalization for signal readout. Conventional MM or MC phono stages will not work in this case.

The Backert Labs Optik Phono 1.1 incorporates a number of solutions aimed at extending tube life, effectively treating the 12AU7 tubes as long-term components rather than consumables. Backert’s automatic bias system ensures that each tube operates in its optimal regime without manual adjustment, maintaining stable performance characteristics over time.

The power supply is implemented in a dual-mono configuration, using two patented Backert power supplies dedicated to the audio signal path and built with PTFE capacitors, chosen for their speed and stability. A separate power supply is used exclusively for the DS Audio cartridge photodetector and is equipped with premium oil-filled ODAM capacitors to ensure stable light emission and signal conversion. Connectivity includes both balanced XLR outputs and single-ended RCA outputs.

Special attention has been paid to materials. Pure silver wiring is used in selected sections, while chassis vibration isolation is handled by IsoAcoustics Gaia feet. The printed circuit board is mounted on a thick solid brass bottom plate, chosen for mechanical stability and resonance control.

The front panel of the Backert Labs Optik Phono 1.1 is made of silver anodized aluminum. A black version is also available at no extra charge. The chassis itself is finished in black as standard, with additional finish options available for an extra $300.

The Backert Labs Optik Phono 1.1 phono preamplifier for optical cartridges will go on sale in January 2026, with a suggested retail price of $11,500.