The KJB Translators were very smart, were both fluent in knowing, speaking, reading, and writing in many languages. Lancelot Andrews knew over 15 languages, for example. The King James translators used a lot more than just Tyndale's Bible. They had lots of material including preserved Beza's 1598 Greek-Latin New Testament, Stephanus 1550 & 1551 Greek-Latin New Testament editions, Latin, the Hebrew 1517 and 1524 Masoretic Text editions collated from many manuscripts, Syriac, Chaldean, Persian, even Arabic (William Bedwell made a 1612 edition of the Epistles of John in Arabic and Latin) and much more manuscripts, and multiple translators knew how to speak 5-20 languages each. The KJB translators were many times more qualified than any and all of the modern versions' writers.

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