To me it seems like it's applicable to all amps. See the thread:
http://www.diyaudio.com/forums/analog-line-level/80194-lightspeed-attenuator-new-passive-preamp.html
Sources are designed for active pre-amps. Most if not all lack the drive to handle the load that these pre-amps put on them. The dynamics suffer the most and distortion increases.
The Glastongury has had some great reviews here in UK, well respected preamp.Hi Flez,
It's this one
http://www.townshendaudio.com/revie...bury Pre 1 vol5 no 3 HIFICritic Hi Res.pdf
We also got an email from Max that he's developed another one at a more reasonable price (~1,900GBP vs ~9,000GBP for the Glastonbury) sans bells and whistles. It's called the Allegri. It should be on the website in a week or two.
Hi Flez,
It's this one
http://www.townshendaudio.com/revie...bury Pre 1 vol5 no 3 HIFICritic Hi Res.pdf
We also got an email from Max that he's developed another one at a more reasonable price (~1,900GBP vs ~9,000GBP for the Glastonbury) sans bells and whistles. It's called the Allegri. It should be on the website in a week or two.
Stereophile review of a similarly transformer based volume control, the Ypsilon PST-100 Mk.II line preamplifier was also impressive. But the price was also impressive!
http://www.stereophile.com/content/ypsilon-pst-100-mkii-line-preamplifier