Okay...
The person you should certainly talk to, is @Bruce Johnson, the official, Ampeg-approved Keeper of All Things Ampeg. He builds approved, dead-on copies of Ampeg basses; has all of Ampeg's records, re their basses; and has probably repaired every original Ampeg bass that still exists. He is a very frequent poster in the "Ampeg and other Scroll Headstock Basses" thread. He will probably know everything there is to know about those strings...
As for me? Sorry, but... I'm still around.
There was some recent minor trouble with me being able to log on to TB, but... all fixed now. 
The person you should certainly talk to, is @Bruce Johnson, the official, Ampeg-approved Keeper of All Things Ampeg. He builds approved, dead-on copies of Ampeg basses; has all of Ampeg's records, re their basses; and has probably repaired every original Ampeg bass that still exists. He is a very frequent poster in the "Ampeg and other Scroll Headstock Basses" thread. He will probably know everything there is to know about those strings...
As for me? Sorry, but... I'm still around.
There was some recent minor trouble with me being able to log on to TB, but... all fixed now.