Paul says; >And, there may have been more than one "bad run" on these tubes. Sounds like the question could usefully be rephrased to ' Are there known 'good' production runs of 8877s?' 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com