On Thu, 28 Apr 2005 16:54:49 -0500, DougC
wrote:

chapter 23, page 925, halfway down the page they have a list of
variables and what they signify. They have one capital-R
subscript-?something? for "valve input resistance at working frequency".
I can't see what this is, in either the CD or my copy, in either the
useage in the equation or the definitions. IS this an "i" or a "t"? Or
smoething else? The only relevant entry I can find is in chapter 38,
page 1366, under (B) Valve and circuit, which lists a lowercase-r
subscript lowercase-i for "input resistance".... ?:|

This is a Greek letter that I have long forgotten, and am too
lazy to look up. It stands for the equivalent input resistance
caused by cathode circuit inductance (I **** thee not), and
doesn't matter at audio frequencies.

Good fortune,

Chris Hornbeck
"Don't panic."