I heard from Victor (I am shameless about bothering him) that the knobs are an Asian hardwood. He is checking to see with Joseph to see what variety.
TVAD That is the same quote I got at $1,250 a matched quad from that vendor. I sent a quad of cca's from a different source to Victor for his evaluation against his wonderful ones. From this source they are about $650 a quad for early sixties. Will let everyone know the results.
I am in Vegas the next 5 days - wish me luck, Daddy needs a new pair of monoamps!