This is a fully balanced input and balanced output state-of-the-art pre-amplifier. It boasts an ultra high current tube rectified power supply, plus choke with NOS filter capacitors. A separate filament Tx and high-voltage Tx is also included to enhance the dynamics and clarity. This pre-amplifier is the low cost version of the QA-808 which is specially designed for those who like both an ultra sweet sound quality , with a very dynamic, musical, high definition detailed and deep sound stage.
The output buffer stage characteristics can change with over 10 different types of tubes: (6G6/6L6/6V6/6Y6/6K6/EL34/6550/KT66/KT88/KT90/KT100) for exact tuning to match the rest part of your system.
Now available is a super rectifier tube up-grade for the 5U4G, this can greatly enhance the dynamics, high and low frequency extension and bass punch, also boasting a stand-by switch for pre-heating of the rectifier tubes to ensure the longest lifetime operation. Rectifier tubes are replacable with high quality ceramic sockets installed.
The 5U4G tube rectifier can further upgrade by our super rectifier STR-104 or higher models , direct plug and play without any mod required.
With this super rectifier adaptor, you can use 300B, 2A3 , 45 , 50 , 80, 83, 1616 , 3B28 or 866A as rectifier tubes option.