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I purchased a quad set of JJ6CA7 3 years ago, which I assume is kind of similar to the KT77.1 tube failed within one month, and was replaced under warranty. Two tubes failed after 9 months, out of warranty. Unreliable product. The JJs sounded fine when working, but not worth the hassles and dollars.I switched to Gold Lion KT77, and have not had any problems.
For reference, I run a bi amp set up w/ a pair of Prima Luna Dialogue 6 mono blocs on the mids / tweets. I currently am using KT 88's, but own a pair of the New Sensor NOS Russian subs for the 6L6.I am also considering the EH KT90 and Tung Sol EL34B.
Thanks for the info. I have been told specifically that quality control has improved since the time frame you referenced. I'll be the guinea pig I suppose...
FYI, my JJ 6ca7 were purchased a few months ago.
I understand that the small diameter pin issue was solved a couple of years ago. I just ordered a quad of the JJ KT77 last night. Frank, I'll let you know how they fair in the U70.Ron
I purchased a quad set of JJ6CA7 3 years ago, which I assume is kind of similar to the KT77.1 tube failed within one month, and was replaced under warranty. Two tubes failed after 9 months, out of warranty. Unreliable product. The JJs sounded fine when working...I switched to Gold Lion KT77, and have not had any problems.