Amperex Mullard 12AT7 ECC81 Vacuum Tube ~ Orange Globe 

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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 =5500|5500µmhos  

 

        Industry Bogey plate current =11.0|11.0mA


                                            Results =5100|3950µmhos  10.9|8.3mA
                                                                                                                                                                         
                                                                                                                                                                                                                 
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