From the manual section provided, this is a typical t type tuner with a built-in balun.
No other balun necessary or desirable.

Gary Lee
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On Dec 24, 2012, at 1:16 PM, Tom Behler <[log in to unmask]> wrote:

> Hi, again all.
> 
> My apologies:
> 
> I should have given more complete info in my last post.
> 
> First of all, the Tentec 238A is rated for up to 2000 watts, so I would
> think  I'd be ok in that regard, since the most my Ameritron AL811H puts out
> is about 600 watts.
> 
> Second, here's a more complete set of instructions about antenna
> connections:
> 
> For balanced feedline systems, adding a 
> jumper from SINGLE WIRE to one of the 
> BALANCED LINE terminals as shown on the 
> rear panel is required. A tin-plated steel 
> jumper for this purpose has been provided. 
> It is attached to one wing nut connector on 
> the back; if balanced line will be used, attach 
> the other side of the jumper to the other 
> wing nut. Then connect the feedline to the 
> two BALANCED LINE terminals. 
> ANT position 4 can be coax, single wire, or 
> balanced line. ANT 1, ANT 2, ANT 3 must 
> be coax only. 
> Please note that 238C does NOT allow for 
> the connection of either coax-fed and 
> balanced line or single wire antennas to the 
> ANT 4 connection at the same time. There 
> is no switchable configuration for ANT 4 - 
> any antennas connected to these jacks will 
> be in use. If you have a coax fed antenna 
> and a balanced line or single wire antenna 
> connected to ANT 4 at the same time, both 
> of these antennas will be in use when ANT 4 
> is selected from the front panel."
> 
> In light of this new info, would I still be ok without the Balun Designs
> balun, as far as anyone can tell?
> 
> On the negative side, would using just the tuner and the antenna without the
> additional Balun Designs balun possibly lead to more stray RF in the shack?
> 
> 73 from Tom Behler: KB8TYJ