The problem was solved by adding a resistor in parallel to the carbon
track resistor. (I did not have the needed value at hand that's why I
used two resistors) And now the AT works perfectly.
Here is a photo of the two resistors in place: AT Resistors
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http://groups.yahoo.com/group/yamahacs80/photos/album/1863574374/pic/10\5926260/view>
Joachim
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