Barry,
A few things that could cause the fast ticking are: one/both transistors from the 0067 IC to the driver transformer bad, the 9V zener to the 0067 open, the two 1mfd filters from the small toroid transformer high ESR (some models say ,1mfd), the two electrolytics on the bottom board (1 and 2mfd) bad (I replaced them in mine with 1 and 2,2mfd of 250V or higher film types because the electrolytics were drying out (high ESR)), diodes around the two TO-3 power transistors or series pass transistor bad or the collector shorting to the heasink. Early models of some series did not have damper diodes from C to E while later serial numbered ones did. If yours does not have the dampers, add them. They have to be fast or very fast 600-1000V 1A types. Note where the position is on the inverter control, clean the pot then rotate it. That pot could be dirty. I have heard of the 120V zener in the power supply going bad causing ticking. I have seen one of these bad before which I replaced with a 1,3W type (BZX85B series).
Another thing could be a ribbon connector being disconnected enough to not make contact while looking like it is fully seated.
The highly likely problem already mentioned is shorted condenser(s). If yours still has the original filters for the 50V supplies, they are suspect. Those should be 100V (UHE is a good replacement). I will assume you noticed the fast ticking even with no plug-ins installed.
The B+ should be 305-310V with new/healthy filters.
Mark
