Seven Reference Mono Phono Stage
The Seven Mono Phono stage can be upgraded to the Reference specification to further improve the musical performance from your valuable record collection. I build the amplifier with some difficult to source and truly unique resistors that in such a simple circuit really bring out a richer and more intimate performance from the artist. I have also upgraded the capacitors to a custom specification to work in harmony with the improved resistors; as in most development activities changing one thing in isolation hardly ever results in a balanced improvement. It never ceases to amaze me how improving one component can impact the music in such a significant way, and also how long it takes to find the right combination to retain true harmony.
Seven Ultimate Mono Phono Stage
The Ultimate is the last but one step to analogue perfection, and involves the use of solid silver wiring throughout the critical signal path, and also silver MC transformers. Silver as a conductor has the advantage of a more revealing and transparent reproduction of the music, however care needs to be taken to ensure that this is delivered in a complete and unified manner as sections of silver in a component in isolation rarely provide a benefit. Finding the right dielectric (insulation) for the cables is also critical to extract the best from this expensive material. I have also redesigned and build a more significant power supply that is unique to audio, which has the effect of making silences darker and dynamic shifts in the music even more dramatic, and with a good mono recording this can be truly captivating. The result is a little like cleaning your windows; you did not necessarily notice they were blocking any light, until afterwards.
Seven GT Mono Phono Stage
The Seven GT mono is the final step towards analogue perfection, and involves the use of a completely new power supply circuit for all the critical stages. Graham says this power supply was 5 years in the making and makes a huge improvement in fidelity taking the Seven GT mono to one of the finest mono phono amplifiers ever made.