ampsandsound Bigger Ben Single Ended Stereo Power Amp

Bigger Ben power amp

The Bigger Ben offers transparency, rich detail, and an incredibly low noise floor. Parts selection is crucial to the design process, each chosen for the level of synergy between parts. Rectification is solid state which permits cooler operation and reliable performance. The amp is configured for ultra-linear operation allowing greater power output and minimal feedback.

The amplifier features an extremely stiff power supply; significantly larger than needed for primary filtering. In the early days of tube amps, chokes were easier to come by than caps and more reliable. As such, large chokes were utilized for primary filtering. As capacitor production gained reliability and costs came down, cap filtering and smaller chokes became the norm. In a single-ended design, a regulated and extremely quiet power supply is very important. Using a large 5 Henry choke is expensive, but yields significant improvements in reduction of DC ripple.

Larger cores and greater inductance allow the transformer to carry a low-end signal with minimal distortion. These transformers are bench tested to perform down to 20hz and up to 20khz. Even if your speakers only go to 50hz like a classic LS3/5 two-way, having an amplifier able to drive that low is pivotal in recreating the whole soundstage.

The Bigger Ben pairs well with most speakers 94db and above. However, Bigger Ben is so quiet it will perform beautifully with full-range or horn-loaded speakers of efficiency above 100db, 700 micro volts RMS noise at idle. Speakers that can go down cleanly to 30hz really bring out the very best of the amp. 20z-20khz -1db at full power. The Bigger Ben (depending on choice of output tubes) will output between 5-7 watts, but there’s a lot more in the tank than that when matched with appropriate loudspeakers.

The amp is compatible with all 6l6 family tubes, including the 6l6GC, KT66, KT77, KT88, KT90, and EL34s. The driver tube is a 6SL7.


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