It depends on what you mean by "best". In my experience I've used a ton of the JJ E34L's with great results. I have not had a failure in a guitar amp in a long time. I used to change them after about 6 months of use when we were using them in our Marshall guitar amps(run rather hard into Marshall Power Brake) but they last much longer in a less strenuous application like Robby's Sovtek Mig 60 which is used for clean power, I change them every couple of years in that amp and that seems to be reasonable. If used for hifi I'd say that they will last a long time.
Recently I tried the EH EL34's in a Marshall rack mount power amp that I'm repairing for a guy and they seem to be pretty nice they bias easily and it sounds good. I can't say how long they last but I've had good results from other EH power tubes that I've used, 6V6, 300B, 6550. I didn't care for their 12AX7 soundwise but reliability wise I'd say that they are fine.
Recently I tried the EH EL34's in a Marshall rack mount power amp that I'm repairing for a guy and they seem to be pretty nice they bias easily and it sounds good. I can't say how long they last but I've had good results from other EH power tubes that I've used, 6V6, 300B, 6550. I didn't care for their 12AX7 soundwise but reliability wise I'd say that they are fine.
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