And the Amplitube SVX-PRO is the "based on Ampeg SVT-4PRO" gear model, so that's available. However, although I am not sure of the exact history of the various SVT models, I think the SVT-II was released in the '80s or '90s, which suggests the SVT4-PRO must be even more recent. So, much like the current Orange gear, I would suspect the SVT4-PRO was essentially McVie's then-current touring gear (rather than something used on the classic '70s recordings or tours).
I found this piece
https://www.soundonsound.com/people/fleetwood-mac-go-your-own-way on the making of the
Rumours album which includes the following note:
The bass, meanwhile, went through a Fat Box DI. "I used to love that sound," says [producer/engineer Ken]
Caillat. "I didn't think you could get any better than that. The amp got in the way most of the time, but still, we'd record the bass on two tracks — direct and amp, probably mic'd with something like a 414 — and many times we then erased the amp when we needed another track.The same piece doesn't say what the amp actually was,
but -- although Ampeg is
often a good guess for the '70s (often a B-15 if not an SVT) -- I actually found this page
http://ledge.fleetwoodmac.net/showthread.php?t=55409 which suggests McVie used Acoustic amps from c. 1972 to 1976/7. Here's a picture with what appear to be (slightly blurry) Acoustic-style controls on the head visible beneath the bass headstock:
More discussion of McVie's use of Acoustic amps here:
http://ledge.fleetwoodmac.net/showthread.php?t=12451Amplitube does have an older model of the Acoustic 360 bass preamp (also famously used by John Paul Jones up to about 1975): the 360Bass Preamp. It's actually really cool, IMO, and I wouldn't mind seeing an upgraded version of it. Acoustic bass rigs were very prevalent in, especially, the early '70s, but seem to have eventually become overshadowed by Ampeg. I've often thought Amplitube's 360Bass Preamp model has not gotten the love it deserves (though I'm certainly guilty of unfairly ignoring it myself!).
Finally, the "414" mentioned in the
Sound on Sound quote is presumably an AKG C-414, modeled in Amplitube as the Condenser 414.
But it doesn't sound like a lot of amped bass made it onto
Rumours!