(1) AMPEREX 12BH7 NOS NIB Tube - Black Plates, Halo Getter




Item History & Price

Information:
Reference Number: Avaluer:29781875Model: 12BH7
Type: Preamp TubesCountry/Region of Manufacture: United States
Brand: AmperexUPC: Does not apply
Original Description:
(1) AMPEREX 12BH7 NOS NIB Tube - black plates, halo getter
This is an Amperex Made In USA (Long Island) 12BH7 tube.  Tested on my professionally-calibrated Hickok 539B mutual transconductance tube tester (minimum value for good tube = 1, 950).  While the Hickok tube testers (and many others) don’t give a test value for a new tube, one can assume that the minimum is 65% of new, which means a new tube should test around 3000 umhos.  Listening tested in my high end Dos...hi Alaap tube preamp.  It is low noise and non-microphonic.   Test values (transconductance) for each triode section are written on the base of the tube with Sharpie pen (removable).  Values are:  3500/3680 umhos.




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