Hello Jack
Yes, the tuner is required, because I use a balanced line to feed a
multiband doublet.
The issue is placeing a 1:1 balun at the input of the tuner, rather
than the output. In order to do that with an existing T match type
tuner, all components must be isolated from ground. This is uncommon,
because a typical T match grounds one side of the inductor.
I have read that a 1:1 balun at the input of a T match is desireable
over a 4:1 at the output.
Thanks