Hi Andy,
Did you already follow the Delay Time voltage in the Delay Pickoff circuit? My interpretation after looking at the schematics is as follows.
Check that U355 pin 6 and Q359A base follow the dial setting from about 5 V to about 13 V. If not then trace back (interrupted R350?).
Check that Q359B base receives the up-going delaying sweep voltage, see also TP400. At delaying sweep start, Q378 conducts and Q948 conducts and holds-off the delayed sweep start. When the comparator Q359A/B switches, Q378 blocks and Q948 blocks and allows the delayed sweep to start (either immediately or after the next trigger recognition).
Albert
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To sum up the problems:
1. Delay multiplier acts like it's always at 0.0
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Andy
