William H. Hayt, Jr. Engineering Electromagnetics Fifth Edition McGraw Hill Book Company 0-07-027406-1 November 08 2024 It was also tested on

It was also tested on our Maxi Preamp II (as a 12AT7) for shorts

3 milliamps' plate current and measured 2060 micromhos

I am playing it in my Pro-Ject Tube Box S phono pre-preamplifier (tube on right) with John Mayall’s seminal "The Blues Alone" album

A nine out of ten

new in box GE 12X4 tube -- and three others just like it -- tested to spec on our Paul Hart-calibrated TV7/U

William H. Hayt, Jr. Engineering Electromagnetics Fifth Edition McGraw Hill Book Company 0-07-027406-1 November 08 2024 It was also tested onThis hardcover book is in excellent condition. The spine is in fine shape with no loose pages. It appears to have been dedicated by The Author to a student.