Is there a difference?
If it is a Vivitar Auto 283 then you may be Just Lucky and have a less than 10v trigger circuit.
Have a look here. http://dpanswers.com/roztr/flash_show.php?id=103&pid=VI283
Anyway try to ger it tested to be sure. Perhaps your camera was just resistent to a bit higer tension but you could cook a new one...
|Black on White by RaVN11|
|Hummingbird and Bee by dibilio57|
from A Big Year - birds
|xheneta iseni _for DPReview by Mike Slade|
from - My Fair Lady - (Portraits in Full Colours Only + A Border)