Zesto ESP

Zestier power – Zesto Audio introduce a power supply upgrade for their Andros II/Deluxe II phono stages and Leto Ultra II preamplifier called ESP for energy source power supply. It swaps the original EI transformer for a toroid to lower noise and increase high voltage capacity by 20%. Concomitant improvements for the three models are said to be higher dynamic range and stiffer current.