Once more we have an example of a repeated a being dropped, in this instance in the 1852 LDS edition. The LDS text has maintained the shorter reading without the a. The critical text will restore the repeated a since 𝓟, the earliest textual source, supports it. For a list of other places in the text where the repeated a has been omitted, see under Mormon 9:4.
Summary: Restore the original repeated a in Ether 1:34 (“a large and a mighty man”).