MATCHED PAIR BY GAIN  6N3P-DR/2C51/6385/ECC42 TESTED WITH ROETEST V10  OTK/RHOMBUS NOS/NIB   

                                       GOLD GRID  !     

                                                                   
                              Manufactured  in 1989 SAME DATE CODES
                                       
                       Military quality check passed (rhombus).

                               OTK (quality control) passed. 

                           

       Tested With Roetest V10 By GAIN  NOS/NIB

Tested with Roetest V10, "the Rolls Royce of tube testers" [emissionlab quote], a wonderful german professional system for testing tubes, it shows everything about a tube.


The gain is the parameter that mostly affect what we hear from a preamp/amp. Using tubes with the same gain lead to same sound level from each channel. 

We removed tubes close to inferior and superior limits. In photos you can see example of data.

 For tubes matched by curves or by Ip and Gm please see our other listings.

The tubes passed all quality checks  - vacuum, shorts, leakage, heater current etc. 


 

Please note that shipping cost is calculated at average. If you have any objections please contact me for a specific quotation.