[BeamT]

Always wanted one of these, or even better a 19" 4 Tube Hybrid.

Is this set equipped with a remote control? Simple power switch? The set was running when it was last powered off?

I'm sure some of the others will comment...and I don't have a 19EC schematic...but here is my swipe at it...

You have already ruled out the run cap, I would have voted for that first. It doesn't seem like your 130v supply is ever getting off the ground.

I believe the Chroma module is the first in the module daisy chain for the 130v supply. Pull that one, or the first one if you can determine which one is first. This should separate the 130v B+ rail from the set at its earliest point without pulling a wire. The modules are just an interlock. Still popping the breaker?

Troubleshoot the 130v supply-
Check the DC resistance to ground from the 130v filters, check the 130v rectifier diode. After setting so long, maybe one of the filter capacitors is bad.

Troubleshoot the 24v Regulated supply-
Check the 24v rectifier diodes for shorts. Check the regulator transister for shorted conditon and the reference zener diode. Check the DC resistance to ground from the 24v filter capacitor.

You could try pulling the regulator transister to isolate the 24V supply. I think the regulator gets its bias from the 130v rail, so with that isolated, the regulator is out of the picture?

Is there a glass fuse that protects the filament secondary xfmer stand-by circuit? Is it open?

On down the road, have the safety capacitors in the horiz output been updated?