just to ground on reality a bit,
If you have not fully restored these units, you are really hearing the impact of aging on these units and comparing that is really subjective. Simply getting the ~45 years old amplifiers stable enough to power on and play music might not equate to an accurate representation.
Speaking of the TA-N7 alone, N7 is a superb amplifier, but there are noticeable differences even between N7 units with different degrees of restoration, leave alone comparing them to other units. Speakers you pair them with is also a critical factor as N7s will not do as well on hungrier loads.
The N-7 fully and properly restored with bulk caps replaced and a critical set of ill fated semiconductors will fare well against most amps, including its vfet rivals from Yamaha and others. To the same token, a properly restored Yamaha such as a B-2, will give the N-7 a full run for the money.
After many hours of listening and tweaking these machines, both on the bench and the listening room, I find the N7 is very precise with a tight bass and airy highs. On the same token, the B-2 goes deep in the lows and has a clear advantage here, especially when pushing anything lower than 8ohms, yet keeping comparable on the highs and separation / depth, but with a wider soundstage. I can't say that I would trade one over the other so for this reason I will keep both..as a matter of fact I will be keeping two of each. If you liked the dual B3s in BTL, you need to hear 2xB2s or 2xN7s bi-amped. My hypothesis is that 2XB3 bi-amped do better than 2xB3s BTL, which is something I am yet to find time for setting up.
