Tube types that can be used with the NS-30C:
All new 6L6, EL34, KT88, 6550, WE350B's, KT66's, Kt77's as well as ALL vintage varieties of these tubes.
This amplifier will be automatically biased, no matter what tube is plugged in. In fact, there will be a bias switch for the larger tubes.
A special edition can be built specifically for 807's.