Looking at purchasing a vintage SVT for steady live use. Would love to hear opinions on Blueline vs. Blackline, Linden, NJ vs. Magnavox as it pertains to tone and reliability. For eg. There is a 1970 Blackline made in Linden, NJ listed for sale recently. Is there a difference (tonally and reliability wise) from this amp over say an early Magnavox model with similar cosmetics ( ie. Black Rocker switches, squared corners on blacklines) or even a later 70's model when they switched to white Rocker switches and rounded corners. Also, opinions on Cabs. Vintage vs. Heritage or even the other new line of cabs from Ampeg. Slant back vs. Refrigerator 8x10. Single 8 x 10 vs. Two 4 x 10's. And lastly, and I only ask this because there seems to be such a sliding scale; what is a fair price for all of the above and what should I look out for if something is priced low? (replaced transformers, good parts/ bad parts ) I'm not super tech savvy but can" call a friend" if I need to so don't be shy about specifics... Thanks in advance for your help!