ZOE

Lector proudly introduces the brandnew ZOE (Zero Ohm Energy) tube line preamplifier featuring an innovative power supply based on a parallel/shunt voltage regulator circuit. No active devices in series with the power supply path just passive components as premium quality resistors provide the voltage drop while an active device – wired in parallel – sink current in order to keep a stable output voltage.

This new concept offers a virtual zero ohm energy output to the tubes without relying on huge amount of negative feedback – in fact it’s a zero feedback design. The result is remarkable performance without the typical effect on overall sound quality imposed by series or pass regulators often plagued with high impedance output and/or strong negative feedback.

Despite its simple basic operation and clear advantages over series regulators parallel/shunt voltage regulators are totally uncommon in audio applications at any price levels. Simplicity sometime is challenging and not that easy to achieve. A shunt regulator runs hot: it requires bigger transformers and huge heat sinks as if it were a class A amplifier – and in fact it is!

The preamplifier gain stage is an all-tube class A design equipped with a pair of renowned 6922 tubes (standard) or 6H30∏ (optional). The latter is a new Russian military rugged tube in current production designed for heavy applications and high current delivery. Thanks to SATC (Self Adjusting Tube Circuitry) the new ZOE can also use a wide range of twin triodes – such as 12AT7 / 12AU7 / 6CG7 / 12BH7 / ECC802S to suite end users’ taste. And swap different tubes has never been easier. A large plexiglas trim on the top can be removed simply undoing four screws allowing you to change the tubes without removing the whole lid . Another small window on front panel lets you see-through while the internal circuitry is back-lit during operational mode.