What about a dummy load?  

Sent from my iPhone
...nr4c. bill


> On Aug 24, 2019, at 7:56 PM, Jim McCook <[email protected]> wrote:
> 
> Eric,
> 
> If the attenuator had more attenuation that caused the drive to be closer to 
> the K-3 output I would think this would reduce the sensitivity of the drive 
> level with respect to change in power output.  6w change in drive (from a 
> larger input attenuator) from 80w would result in less output change (with 
> the smaller attenuator) than with 6w change from 30w. Is this right?
> 
> Jack,
> 
> When I change to the tube amp I use all the same cables and connectors for 
> RF.  None of the problem occurs.  I have tried substituting cables.  I have 
> not substituted the feedline of the 40m antenna, though.
> 
> Jim
> 
> 
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