You want to take the latest BOM, enter it into Mouser's BOM tool,
then look for substitutes on the update list, or figure them out
yourself if there are any out of stock parts. It's very handy.
I usually try to keep the Mouser BOM up-to-date and not edit the parts list in the manual very often as supply can change often - especially due to the RoHS change over. The diytube manual is mine, Ned's tubezone is a mod and the third manual is the original Mark III manual from Dynaco. The Dyna manual can be a handy reference though the driver is completely different.