Power Amplifiers

The BHK Signature 250 and 300 power amplifiers are the culmination of one man’s half-century search for perfection in music’s reproduction. Bascom H. King has designed amplifiers for many companies, some selling in excess of $100,000, including: Constellation Audio, Marantz, Infinity, and Conrad Johnson. This is the first amplifier Bascom felt was good enough to lend his name to. It is his finest achievement in a lifetime of work.

AirTight released the original ATM-300 single-ended power amplifier employing WE300B tubes in 1999. The 300B tube had achieved iconic status because of its clarity and musicality and was appearing in statement amplifiers offered by many of the world’s new wave of innovative amplifier designers. The ATM-300 was immediately well received, becoming well known for its clarity and tightness as well as its bass performance in comparison to other SET designs.

The legendary AirTight ATM-1S is a culmination of many generations of ATM-1 stereo amplifiers and released to commemorate the company’s 20th anniversary. AirTight have developed a philosophy that it is not difficult to choose a set of valves and build an amplifier however to build a great amplifier takes time. Time to really understand the nature of that valve, time to experiment, adjust, listen, hone, evolve and refine the design so that it is a pure expression of that valve’s best capabilities.

There are valid reasons why many audiophiles believe that single ended amplifiers can provide ultimate musical enjoyment. They are often perceived to have a purity and immediacy which to use a some commonly used descriptions, ‘lifts the veil’ or ‘opens the window’ into the music. Nevertheless, single ended designs have often been limited by their low power outputs which required the use of high efficiency speakers. Well-designed high efficiency speakers that deliver deep bass are rare and expensive. So over the years, enthusiasts who wanted to use single ended amplifiers had to either live with their limitations, go DIY or make a serious investment in speaker technology.

Reference Mono Power Amplifier (211 Push Pull Mono Blocks)

Reference Stereo Power Amplifier (6550/KT88)

Reference Mono Power Amplifier (6550/KT88) (Pair)

This dual mono up to 45 watts in pure class A amplifier incorportes all the unique technical and sonic innovations which have propelled its predecessors into audio legend. 

The MkII version allows the use of the KT150 new pentode tube.