Help Need instruction Manual for Vivitar 3900 Flash Unit

Hello boysos and girlziz.. I have this super antique yet well working Vivitar 3900 flash gun auto thyrister thingy..
I like to strap it to the side o my 4x5 fieldy and go out stressing.. Trouble is its been a few years since I humped the chunk and now I can't find my manual.. Anyone got a few words of guidance re using this little lollypop..

TIA

You could try the 'Butkus Camera Manual' site (recommended),
or contact Vivitar directly, (good luck with that).

http://www.butkus.org/chinon/vivitar_flashes/vivitar_flash_units.htm

Email: support@vivitar.com
Contact or call Vivitar at: 805-988-0463
Phone:
US: 1-800-592-9541
UK: 0-800-917-4831
Australia: 1-800-006-614

I spent about an hour googling.. came across Butkus.. nothing.. and Vivitar site does not recognize the 3900.. I guess I will e mail them.. Was hoping someone might be able to send me ascan of the relevant info..