(1) AMPEREX 12BH7 NOS NIB Tube - Black Plates, Halo Getter
Item History & Price
Reference Number: Avaluer:29781875 | Model: 12BH7 |
Type: Preamp Tubes | Country/Region of Manufacture: United States |
Brand: Amperex | UPC: Does not apply |
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.