I wrote a new valve data program that can display graphic images of valve data. It also can display the data in a table format. This page contains the data files created by the old data voltage program Many of the old files are garbage because there were no data checks on what was being entered. I am leaving the old data files alone for now because there may be useful data files. Please use the new Voltage data program to enter your tube amp voltage readings. Here are the links for the the new program.