Butler Audio TDB 3150 User Manual

 

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Congratulations  

Please accept our sincere thanks and congratulations for making 

your musical choice Butler Audio.  This new USA-Patented 

technology 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 Driver

b 

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.