[Amps] 160 efficiency problem

[2]

>Hello,
>
>    I am almost finished with the new homebrew yc156 amp.
>It works fine on 15 - 80 meters but I am having a problem with
>160.
>
>     With 5000 watts in, I am getting about 1200 watts out.
>
>   I have added inductance to the plate and cathode chokes,  changed
>(padder caps for the load to 400 pf/ 7.5kv) ,  

€  Please describe padder caps and give RF current rating at 1MHz.  tnx

>and setup the tank
>several
>times.     The blocking cap is a 1900 pf .
>
>    THe other sympton is that grid current is much higher on 160 than
>all the other bands.
>
>what am I missing?
>
>TIA for any assistance
>
>Lynn  NO9Z
>
>
>
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Rich, AG6K, 805-386-3734, www.vcnet.com/measures