This is not typical for VAC, and in fact I have a friend who’s in regular correspondence with them currently.
1. Email is not the most reliable form of communication. Call them. I sent an email question a couple weeks ago and got no response. No biggie. I figured it out on my own, but if it still mattered I’d call. Though over the past few years, most of my emails have gotten a very friendly and helpful response from Kevin himself within a day or two.
2. They’ve been hella busy for a few recent weeks from the Capital Audio Fest. Communications won’t be quite as on point at these times.
The Signature is a very nice preamp!