Single-sweep mod for 531/541

Tim Phillips <t.phillips@...>

Hi, all;
I have a 531A (with it's service manual), and
I recently saw on ebay what looked like a 531 with a
single-sweep feature added; (switch on front panel.)
Is this easy to implement? The photo I saw looked like
a genuine Tek mod, with a small photo-etched plate for the
kindest regards

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