Hi Matt,
I will put a permanent link to Glenn's site in our 'Creative Collections' section, as per our other selected websites from manufacturers we recommend.
Do you think Glenn would be interested in becoming a member? His contributions would be most welcomed, and I'm sure he would feel at home along with our other resident 'techies' such as Anthony Matthews from Tube Distinctions, Richard Dunn of NVA, and Guy Sergeant from Puresound, amongst others
Incidentally, as an aside, the Charisma really benefits from having the Yugoslavian and Russian valves inside (Ei ECC83 and Russian 6H9C) upgraded with NOS Mullard ECC83 and ECC35 respectively. The Mullards are not cheap, but, boy, what a difference they make! It transforms the Charisma X (mine has silver caps inside, incidentally) from an excellent preamp into a mind-bogglingly wonderful one, especially the in-built phono stage!
One quick one I would run past you is do you think there’s any mileage in having an external PSU made for my Charisma X? I always feel that mains transformers should be in another box separated from ‘delicate’ preamp circuitry (magnetic fields and all that). Maybe it’s a throwback from my Naim days! And also is there any sonic advantage in having separate volume controls for left and right channels as with some of the Croft designs? I would imagine there is because Glenn isn’t usually one for including anything that's superfluous to performance. If either of this is worth doing I would ask him to carry it out on my Charisma.
Marco.