The A23 transformer is a phono step-up transformer. In this case, the one Aronsss uses is the one optimized for a Denon or EMT cartridge. The stock transformers in Shindo preamps are optimized for use with the Shindo modified SPU or other really low impedance cartridges. I owned the A23 transformer for a about a month and it was fantastic with an EMT JSD5 cartridge.
Shindo makes an outboard step up transformer called the Arome. Similar concept but also optimized for an SPU.
Shindo makes an outboard step up transformer called the Arome. Similar concept but also optimized for an SPU.