I have two tubes that sorta look like 2C39's One is marked Eimac 7211 (ceramic base) One is marked Eimac 381 (glass base) Can someone tell me what they are? Or possibly point me to a reference? Thanks... Mike -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com