Here are photos of the wave forms from U400 and U470 of the PG506. The photos are keyed to pins as referenced on the last two photos of the series. These were obtained using my TDS460A. Most pins have 3 photos, one at Full CCW, Zero and Full CW variable. Std amplitude set at 1.0V.
Any questions, feel free to contact me as needed on or off list.
Hope this helps.