Well, I cannot believe anyone would be disappointed in the JJ 2A3-40 in any BH product amp designed for the 2A3. My review of the JJ's can be found on the Eurotube site here( http://www.eurotubes.com/eurotubes-JJ-2A3-40-Review.htm ). Paul Birkeland built my Custom BH 2A3 amp, and I am extremely happy with the JJ's as well as with Eurotubes, which guarantees their tubes for six months.
Cheers, Hank in Eugene