photogenic
The Photogenic AA series was introduced in the 60s and was a very common system. The first pack allowed the use of 4 heads and used ratio plugs to set the flash balance. All of the heads are nearly indestructable with a minimum of components, and use an automotive signal lamp for modeling. Although these came with parabolic dish reflectors, one can still get the speedring mounts for any soft of softbox arrangement. They are a commonly sold item on fleabay as well.
I have one of these units, and they work well. Its a challenge to find suitable capacitors to rehab them, but these units give a look that is hard to emulate with more modern studio flash equipment. The later AA series supplies allowed two different supplies to be chained together so that eight heads could be used...
PS--It is a good idea to invest in a Wein synch isolator for any of these old strobe systems. They shoot a lot of voltage through the shutter contacts...