[TenTec] Ten Tec and Butternut HF6V Problem And Question

[OTAKEBI@aol.com]

I have a Butternut HF6V ground mounted vertical and on 10 meters and 14  
meters I get low output from both my Corsair II and OMNI V.
On 10 meters my output on the Corsair II is about 60 watts.
The antenna shows a flat SWR
If I place the tuner in line I get an increase of about 15 watts after I  
adjust it for the same SWR.
I notice that I get low output on my Butternut Butterfly Beam.
About the same as on the vertical on 10 and 20.
However, when I switch to my G5RV I get full output from both rigs on 10  and 
20.
I get about 95 watts out with a flat SWR going through the tuner.
Anyone on the list had this problem come up with the Butternuts and Ten  Tecs?
I don't see what could be cutting back the power especially on the corsair  
II which does not have foldback protection.
Thanks,
Dan/N4VET