Butler Audio TDB 5150 manual Congratulations, Past is the Future

Congratulations

Please accept our sincere thanks and congratulations for making your musical choice Butler Audio. This new USA-Patentedtechnology from BK Butler promises to become a classic design, just as his former efforts have in the professional music and auto sound industry.

After more than 25 years of tube audio experience in the Professional Music Industry with some of the world's greatest musical talents, BK Butler has now created an entirely new class of home audio and theater amplifier products. With careful emphasis on the achievement of practical "all tube" response characteristics, Butler Audio's Tube Driverb BLUE technology satisfies even the most critical vacuum tube audiophiles.

The Past is the Future™

For the first time in the history of tube amplifier design, the original "Edison Effect," or the essence of pure Thermionic vacuum tube emissions have been fully utilized to yield very low THD distortion and produce "all tube" type musical response characteristics in a multi- channel home amplifier. With painstaking efforts and great attention to detail, BK Butler has balanced the sonic response, load and transfer characteristics of individually selected twin triode vacuum tubes to operate under optimum conditions in this open- ended ZERO global negative feedback circuit topology.

Previous hybrid designs employing vacuum tubes generally utilized tubes only in impedance-isolated preamp or driver stages. However, Butler places the triodes exactly where they should be: DC - Coupled through the output power devices to the speakers. Therefore, the tubes are positioned to naturally and actively respond to the speaker load. This also completely eliminates one of the most inefficient and non-musical components in a typical tube power amplifier: the Output Transformer. Without hundreds of feet of phase-shifting, musicality-robbing wire and many pounds of induction-generating core iron to overcome, Butler's newly patented current-multiplying DC coupling circuitry allows the output driver tubes to directly operate into the fixed ratio-reduced speaker output load. This novel design results in the production of authentic power vacuum tube characteristics hundreds of times greater than normal capabilities of the driver tubes.

Comparable in concept to precision racecar active power steering, Butler allows the tubes to "power steer" the audio output signal directly into your speakers. The result: A superlative marriage of tube and solid-state technology without the limitations of either. Literally, you get the reliable, efficient power capability of solid-state with all the greatly extended dynamics, warmth and musicality of the highest quality vacuum tube design available today.

3