Jeff Dorgay has posted a review of the Coffman Labs G1-A preamplifier ($5495) at TONEAudio. His conclusions:
“Judged strictly as a linestage for $5,495, the Coffman G-1A is at the top of its class. The fact that it includes an excellent phonostage and headphone amplifier makes it the bargain of the year. All of the tubes are easily found and those predisposed to tube rolling can tune and tweak until Election Day. Coffman has plans to expand the lineup, possibly making the phonostage and linestage separate boxes. When I asked him if there might be a companion power amplifier in the works, he smiled that evasive smile that usually means “yes, but I don’t want to talk about it now.””
You can read the full review here.