08-20-2014, 02:41 PM
The following link has the formula and near the end another link to a spreadsheet that will calculate it for you:
http://www.vintage-radio.com/repair-rest...calcs.html
http://www.vintage-radio.com/repair-rest...calcs.html
John KK4ZLF
Lexington, KY
"illegitimis non carborundum"