> Silly question, I guess, but where are the Cetron 572s made? China > > RCA show neutralisation on grounded grid 811s, too. Bill Orr's handbook shows three ways to neutralize G.G. cathode driven tubes. (((73))) Phil, K5PC -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com