My Cantenna does this - it also produces an emf when hot!
Had me baffled for a while, so I took it apart - the voltage is directly
off the load resistor not the dissimilar metals of the clamps and
plating at the ends of the resistors.
Paul
In message <002901c09e00$1da64b40$db3c1ad8@colinlam>, Lamb
<k7fm@teleport.com> writes
>
>I now recall working on an Alpha 77 that had a similar problem. Power
>output creeped upward. After awhile, the amp became very efficient.
>
>It took a bit longer than it should have taken for me to realize that the
>dummy load was heating up and increasing in resistance. There was no
>increase in power at all - just meter readings. I then measured the dummy
>load and learned that even cold it was over 55 ohms.
>
>73, Colin K7FM
>
>
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>
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