JJ 12AX7 turns white and dies.

  • Thread starter Thread starter Nigel
  • Start date Start date
Mullard CV4004's are great, but if you like those, Svetlana 12AX7SV's are 95% the same thing, just cheaper.

*EDIT* That's me assuming you're talking about CP, tho. Maybe you're talking real-deal Mullard?
 
Nigel said:
Me too! I used the 6L6 in my Zinky and E34L in my Rivera...
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I also use a Rivera! I have a Clubster Royale Recording Top (6V6). It always sounded great but damn it man once I threw in the mix of NOS tubes, there is so much beauty, gut punch, depth and sustain, that I tend to not even throw pedals into the mix. The boosted gain channel on this thing is absolutely massive and so is the clean. Super glad I found this specific amp and then NOS tubes, because it's absolutely heavenly.
 
Racerxrated said:
That’s JJ for ya.

J/K. I know 65% of their stuff doesn’t randomly die ?

This is why I only use from my stash of mostly vintage stuff. Maybe one failure in the last 15 years. VS at least 5 JJs; both power and pre. I learned to pull any JJ from any and every amp I buy so there’s no risk to the transformers if/when the JJs give out.
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I've had JJ in 60 or so amps and have yet to have a failure in both pre and power amp tubes :dunno:
 
GuitarGuy08 said:
I also use a Rivera! I have a Clubster Royale Recording Top (6V6). It always sounded great but damn it man once I threw in the mix of NOS tubes, there is so much beauty, gut punch, depth and sustain, that I tend to not even throw pedals into the mix. The boosted gain channel on this thing is absolutely massive and so is the clean. Super glad I found this specific amp and then NOS tubes, because it's absolutely heavenly.
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t. Based NOS tubed Rivera enjoyer.
 
I had a 5150 50 watt 6L6 sent to me years ago . No sound on the red channel and If I remember correctly it was the 12AX7 in V2 , looked like the one the OP posted. Replaced it and that took care of it
 
MetalHeadMike said:
I've had JJ in 60 or so amps and have yet to have a failure in both pre and power amp tubes :dunno:
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My heavy metal friend, count yourself lucky.
???

It’s honestly happened to me too many times to count. But, they were mostly what came with the amp. Once when I bought new JJ pres. Never again, for me anyway .
 
Over 40 years of playing tube amps and I have never had a preamp tube lose vacuum and go white. That was, until last year. My Rivera R100 had three of these within as many weeks! V1 and V2 spots, a mix of Chinese 12ax7s and JJCC83. I was told there is nothing mechanical within the amp that would cause this and it must be me being too aggressive when tube rolling. :rolleyes: Be that as it may, I have not had any more of this phenomenon in this amp or any other amp since.
 
UPDATE!

The HELL with short plate Mullards! They are harsh and less than JJ ECC83's. I put ONE long plate f92 in V1 and now the goddamned thing is a fire breathing BEAST worthy of making soundtracks for WAR! PUT ONE IN YOUR 5150 V1 and prepare! JJ's everywhere else. This is the way. Clips to come.
 
Well the thing smoked my beloved long-plate mullard. Watched a lightning show inside the tube. What the hell? The amp must go to a tech. WTF is wrong with it to be smoking the V1 tube? First a JJ, then this? Didn't kill a short plate mullard nor the EHX that was in it before.

Ideas?
 
I left it on for a couple of hours to stress test it, not as bad as Ed did leaving the thing on 10 and walking away from a feedbacking guitar for a MONTH...the amps are cheap I know but what the hell could be causing it to smoke V1 tubes?
 
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