Matched Pair Amperex Bugle Boy 12AX7 ECC83 Vacuum Tubes Very Strong  
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 The measurements provided were made on a Triplett 3444 that has been modified to test tubes

 in accordance with the original manufacturer’s stated test conditions, including bogey values. 
This includes the use of cathode bias where specified.  
This tester was prepared by Paul Hart of Roswell, GA.
Further information is available on request.

Industry Bogey transconductance =1600|1600µmhos  

 

        Industry Bogey plate current = 1.2|1.2mA


                                            Results =1525|1660µmhos ~1.18|1.33mA

                                                        =1470|1590µmhos ~.96|1.03mA


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