Jedinite24 and Samzx12,
It was probably EH/New Sensor's fault. I think it was about 2-3 years ago when my audio dealer started complaining about a VERY bad run of EH KT88. They experienced an extremely high (early) failure rate of these tubes in that time period. Not sure if they've fully resolved those quality issues. The EH KT90 was far more reliable, even though I actually had one of those blow up (at low hours) in my amp. The KT120 have been very solid thus far.
It was probably EH/New Sensor's fault. I think it was about 2-3 years ago when my audio dealer started complaining about a VERY bad run of EH KT88. They experienced an extremely high (early) failure rate of these tubes in that time period. Not sure if they've fully resolved those quality issues. The EH KT90 was far more reliable, even though I actually had one of those blow up (at low hours) in my amp. The KT120 have been very solid thus far.