BFG540 In a message dated 7/18/2015 6:37:34 P.M. Eastern Daylight Time, john at miles.io writes: Last time buy 31-Dec-15. :( Have you heard of any good substitutes? I've built a lot of amps with BFG591s, and they also got the axe recently. Small-signal RF bipolars seem to be an endangered species. -- john, KE5FX Miles Design LLC