The wing nuts are for a balun, the one thing to make sure of, is for the 
cobra antenna, you want a 4:1 balun, as long as that's a 4:1, not a 1:1 
balun in there, you should be in great shape. I wouldn't think there would 
be any more or less RF one way as the other. I wouldn't worry about the 
power rating either, if the tuner can handle 2K the balun should be good for 
close to that and no way your amp should hurt it.
----- Original Message ----- 
From: "Tom Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, December 24, 2012 1:16 PM
Subject: More on interfacing Cobra Ultralite Senior with Tentec 238A manual 
tuner


> 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
>