I did send a note to Bazooka customer service after I posted this. They had tech support send me a note. It is understandable that they didn't want to give me schematics - it dawned on me after I sent it that it is "intellectual property". Anyway, I sent a response asking for just test parameters but no response to date. I may end up using my other tube as a means of determining but I'm a little worried that I could fry it inadvertently. Thanks for the response though!