I've heard from service technicians that the KT-120 are just terrible (that seems to come from a reliability viewpoint). 6550s and KT-88s will have a home for decades to come in guitar amps and vintage audio gear. So yes, we still need them.
Do we still need 6550 or KT88 tubes?
I would like to learn your opinion and experience with KT120 tubes.
Considering that KT120 match 6550 or KT88 based amp (is a direct replacement), how do you like the sound of KT120?
Do we still need 6550 or KT88 tubes?
Do we still need to pay for NOS power tubes?
BTW at the moment a KT150 tube is announced. Should be even better than KT120 and could be interesting upgrade for current KT120 owners.
Considering that KT120 match 6550 or KT88 based amp (is a direct replacement), how do you like the sound of KT120?
Do we still need 6550 or KT88 tubes?
Do we still need to pay for NOS power tubes?
BTW at the moment a KT150 tube is announced. Should be even better than KT120 and could be interesting upgrade for current KT120 owners.