I have asked my question because I would like to replace my current KT120 set of power tubes (because of the age).
I have Jadis amplifiers that can accept EL34, 6CA7, KT77, KT88, KT90, 6550, KT120 and probably KT150.
In the past I used 6550 in my amps and Gold Lion (reissue) KT88. I remember when I switched to KT120 about two years ago it was big WOW factor. Better dynamics, deeper bass, more lively and open sound. Since that I was not listened to 6550 or KT88 and I wonder if there is a good idea to go back to these old tubes - rather back to good Svetlana Winged C 6550 than KT88.
Maybe a better idea is to wait for KT150 tubes.
As for reliability I had no issue with KT120 at all, but had a lot of problems with KT88 Gold Lion including blowed cathode resistors.
I have Jadis amplifiers that can accept EL34, 6CA7, KT77, KT88, KT90, 6550, KT120 and probably KT150.
In the past I used 6550 in my amps and Gold Lion (reissue) KT88. I remember when I switched to KT120 about two years ago it was big WOW factor. Better dynamics, deeper bass, more lively and open sound. Since that I was not listened to 6550 or KT88 and I wonder if there is a good idea to go back to these old tubes - rather back to good Svetlana Winged C 6550 than KT88.
Maybe a better idea is to wait for KT150 tubes.
As for reliability I had no issue with KT120 at all, but had a lot of problems with KT88 Gold Lion including blowed cathode resistors.