Need Manual for Sunpak Auto Zoom 3400

Anyone still looking for this manual - you find it here (scroll down):
http://www.butkus.org/chinon/flashes_meters/sunpak_flash/sunpak_flash_units.htm

I just received one of these units in a package of gear I bought.

How save is it to use on modern digital cameras? The manual doesn't state any voltages.
The flash controls are pretty neat, both for Auto and manual use - the integrated flash bracket design is nice too.
 
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