THE GREAT MULLARD MAGIC BLOG
WHAT DO THOSE LETTERS AND NUMBERS ON A MULLARD ...
My erstwhile inquisitor was referring of course to the type numbers, screen printed with printers ink on a valve envelope - what do they mean? Well, let's start with...
WHAT DO THOSE LETTERS AND NUMBERS ON A MULLARD ...
My erstwhile inquisitor was referring of course to the type numbers, screen printed with printers ink on a valve envelope - what do they mean? Well, let's start with...