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Maximum is deflection to the right and minimum is the dip to the left.
The problem here is the careful staggered tuning in order to get the full 4MHz bandwidth. There is a lot of gain in the four stages. You can assume unless someone before has tinkered with it, the stages were close to being correct.
So let's go back. Make sure it is not oscillating. To confirm it is not oscillating, switch the HP8601a off and ensure there is no voltage across the 2nd detector load. By no voltage, I mean less than 100mV. Confirm the traps are correct and then set the preliminary staggered tuning setup prescribed in the manual. The spot frequencies are to get the alignment close before the sweep alignment.
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