Vivitar 285HV Flash "thyristor problems" Questions

...help is appreciated. I had the same problem with my early Vivitar 283 flash. I discovered that the thyristor on the trigger board tested as an open circuit. Trying to find a replacement for a 30

...a capacitor cannibalized from a cheap second-hand shoe-mount flash having the same feature (series thyristor circuitry) and as high guide number as available. Both Sunpak units are highly populated ...

...the image has a dark shadow on it like it never had a flash at all. (does the round button "auto thyristor" have anything to do with this problem?) and just what is that knob used for anyway???? ...

285, red/green lights blink, whines on start up, but won't fire Hi, I have a 285, not HV, zoom thyristor flash. I put fresh alkaline double A's in it , it whines, the red and green lights flash, and ...

...the arc.  If no arc, it is likely arcing in the charge capacitor or what might be left of the thyristor..  Which could mean a broken contact, solder connection or

no 'green' light on bacl of my 'old' Vivitar 285 My Vivitar 285 Thyristor with new batteries whines while re-charging (I believe that noise is normal). However, only the Red light glows. The Green ...

...thyristor I have one of the above flashes that I would liket to use with my Nikon D200. I am afraid that the trigger voltage produced might be too great for the DSLR circuits. Can you explain what my ...