| Nothing wrong with using files of this sort as a shortcut but you will do yourself a favor if you learn to do these and other calculations yourself. Understanding what is really going on will serve you well in this hobby. The more you learn the more you will enjoy.
:This site explains it all.
:The nicest thing is that at the very bottom of that page he provides a link (zip file) that you can download. It unpacks and creats an Excel spreadsheet file that does all the calculations for you.
:I use it all the time.
:GREAT!.
:
:http://www.vintage-radio.com/repair-restore-information/valve_dropper-calcs.html
:
:IPAddress: ***.115.81.106
IPAddress: ***.235.6.146
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Robin in Kansas 
Peter G Balazsy 