So, Ampeg was a sponsor of my last Emerald City Bass Convention. They had a line up of amps there, as well as their Classic Preamp, Scrambler Overdrive, and Scrambler DI pedals. They also gave 4 of them away to get them into the hands of more players, since the Classic Pre was so new (the ones they gave away were from the first shipment to land in the US). So, I got to play those right next to a Heritage SVT, SVT-7PRO, a PF-500, and a PF-50T.
To my ears, the best way to tackle the Ampeg tone across all of those was running two pedals - the Scrambler Overdrive into the Classic Pre. This was absolutely nailing the SVT and PF-50T tones, easily. It couldn't quite get the 7PRO, but, to me that's not a big deal.