In the late 80's I bought an early 70's Linden, New Jersey made SVT and matching 8X10 cab. I played it for about a year before I developed some medical issues and had to sell the rig. To this day I have not played anything that remotely comes close for sound and feel. Best bass sound there ever was or will be, IMHO.
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I had the chance to A/B/C an SVT and matching 810 cab against my Berg NV412 with both Eden WT800B and Mesa Boogie 400+.
Both rigs KILLED the Ampeg rig as far as tone, clarity, thump, and volume goes. The Mesa was both louder and had better tone at high volume than the Ampeg rig. The Eden had great tone, although not as good as the Mesa, but it was knocking pots off the stove in the kitchen. That monster into a 4 ohm cab is an earthquake machine. Food for thought...