Graham Slee Solo Ultra Linear Headphone Amplifier

Those who can recall the valve sound, or who listen using what I term a real valve amp, will be able to relate to this...

Valves sounded warmer but not over-warm - they rendered the bass much more naturally in a much less restricted way than solid state.

The valve scored in the presence band (what's now called midrange) communicating the feel of the music so you didn't have to try to get into it.

The highs sounded much clearer - not edgy - so you could easily discern between similarly sounding instruments

But mainly they made music something everyone enjoyed - families would gather round the valve set, listen, hear and enjoy, but I never saw that with solid state. The main thing I recall is being drawn into the music and being able to picture the images being painted in my mind. The valve always "told the story" better!

Good valve amps are pricey but solid state can be made much more affordable - wouldn't it be great if we could make it work?

Various arguments have been put forth as to why solid state cannot do the valve trick and the internet carries numerous points of view - some quite forceful, but still no solution. However, we touched on it to varying degrees with our earlier phono preamps but didn't fully understand how. In a way the Era Gold V and early Reflex phono preamps were almost there, with customers and reviewers suggesting they had valve-like qualities.

The Ultra-Linear technology is the result of two years almost solid research, exhaustive development and testing. We researched how to mimic all the valve’s characteristics to improve our products. What we found was that a number of op-amps (integrated circuits) could be made to perform just like valves - discrete transistor circuits being far less predictable. Graham Slee's products with Ultra-Linear technology feature significantly wider bandwidth (they go to higher frequencies) before negative feedback is applied - just like the best valve amps. What a breakthrough - valve sound at less than high-end prices!

We call this innovation Ultra-Linear because that was the tag used to describe the great performance of the best sounding valve amps that first made their appearance in the mid 1940's. These techniques vastly reduce the phase modulation distortion and linearity distortions that are hard for solid-state audio designers to perceive let alone measure. Ultra-Linear technology will feature in our top of the line products like the Solo Ultra-Linear headphone amplifier. More products will benefit from this new technology including the Reflex, Revelation and Gram Amp 3 Fanfare phono preamps plus the Elevator EXP MC step-up amplifier.

Natural like a valve: solid as a rock!

Graham Slee"