Erasmus famously only had 7 manuscripts on hand when he compiled the first edition of his "Novum Instrumentum omne". However presumably as his text underwent several revisions after that, and then became the basis of the versions produced by Stephanus, Beza and the Elzavirs, and ultimately the KJV almost a century later, more scholarship was done and more manuscripts were brought in.
Or were they? Is it possible to know how many (and even which) manuscripts were used by the Textus Receptus editors throughout the decades and ultimately served as the basis for the New Testament in the KJV? Or does the KJV NT still primarily just rely on the the 7 manuscripts that Erasmus started with?