JJ EL84s

Discussion in 'Amps and Cabs' started by BluntForceTrauma, Feb 15, 2019.

  1. beatnik

    beatnik Member

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    I have bought my EL-84 tubes (among others) from Eurotubes and I have never had an issue with the power tubes. In addition, I really like the sound. I have used a couple of other brands, goose tubes and ehx, and in my amps and with my rig the Eurotube EL-84 have worked the best.
     
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  2. HotBluePlates

    HotBluePlates Member

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    TubeDepot offers a 90-day warranty, and will even do a refund in the first 14 days. Did you make use of that warranty?

    I ask because a vendor might do less testing (time consuming) and make up the difference by agreeing to swap or refund for defective tubes. It's possible (though not certain) that part of the game here is a customer may not bother to follow-up on the warranty claim, or will wait too long between ordering/receiving tubes and actually using them.

    I can't speak to JJ tubes, but Groove Tubes used a logo paint that would burn or change colors if the tube had excessive dissipation/heat. It was a giveaway sign that the customer abused the tube somehow.

    If you always have only one tube burning up, that could be an amp problem. This is especially true if the burned paint is always in the same socket of that amp.
     
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  3. Britishampfan

    Britishampfan Member

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    Retraction, My old Traynor runs 6v6gt, I was thinking of a 71 Bassmate.
     
    Last edited: Feb 19, 2019
  4. avspecialist

    avspecialist Member

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    I read a lot about JJ issues failing. I only had a pair of el84 burn up almost 15 minutes ito playing. Mojotone replaced them to me without any hassle or real questions. I have JJ el34’s in my Marshall JVM410H for over 5 or 6 years and no issues. I have a lot of their preamp tubes. other than coming off a little dark sounding the seem to be a good cheaper price tube.
     
  5. easyed

    easyed Supporting Member

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    In earlier post, I sang the praises of the Russian 6p14p tubes that I put in my MAZ 18 - I still do. I find it interesting that the tube specification for the MAZ 36 is JJ EL84's. IMO, Dr.Z has a great ear and engineering acumen to go with it, so the JJ EL 84's must be pretty good.
     
  6. El Rey

    El Rey Silver Supporting Member

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    Been running them hard in my C30 and Lightning for almost a year.....still sounding great....no issues.
     
  7. jlagrassa

    jlagrassa Supporting Member

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    I'm a fan of the JJ EL84, I get them from Eurotubes only and never had an Issue other than normal wear.
     
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  8. HotBluePlates

    HotBluePlates Member

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    Got a link for that spec? Because Dr Z says below that while he used JJ for the longest time, he does what you do, and uses the 6π14π (though perhaps that's not in every EL84 amp he makes).

    The video is only 8 months old...

     
  9. Jr Deluxe

    Jr Deluxe Member

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    Ive been using JJs in the monoprice 15w for daily practice and weekly gigs. So the usage is high not just an hour on the weekend. I thought i had a failure after about 3 months but looking back i think my problem was a cheep GC guitar chord i was using. I popped in a new tube set and i still had this intermittent crackle. I grabbed a new higher quality cable and havent had a problem since. The amp is obviously cheep so i have a hard time putting in a $100 set of tubes in a $150 tube amp. At $20 a set, JJs sound and last way good enough. If i only retube once or twice a year im happy. Thats how often i retubed my el34 marshalls at $60 a set.
     
  10. easyed

    easyed Supporting Member

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    http://drzamps.com/support/tube-info/ I got the model number wrong, should be MAZ 38. It takes a matched quad of JJ EL84s.
     
  11. Jaji

    Jaji Member

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    Before I learned about biasing amps, I went through a few different quads of EL84s. Stock, the amp had Sovteks. No issues, but after 2 years of heavy use, I installed a set of Mullards. Within 6 months, they red-plated on me. Next quad was JJ. No issues for the next 2+ years of heavy use. Now that I know how to bias the amp, I have a quad of Preferred Series, just to try something different. Awesome tubes.
     
  12. classicplayer

    classicplayer Member

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    As in post #7 above, I second the choice of Shuguang EL84STR aka TADEL84STR. This pair is
    in my Orange Dark Terror and well in place of the original JJ pair. One of my JJ EL84 blew taking out a fuse. I'm expecting these new Shuguang pair to out last the (then) 10-month old JJs.


    classicplayer
     
  13. beej

    beej Supporting Member

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    I've got an amp that eats EL84s (older Guytron) and I'm continually trying out EL84s to see what works.

    Fwiw, the winner so far, for me, has been the New Sensor Mullard EL84s. The Russian 6P14Ps are a second. I don't love the JJs, but in the past they were reliable and inexpensive, though they never lasted too long.
     
  14. HotBluePlates

    HotBluePlates Member

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    :dunno Maybe they sell more MAZ 38's and need to have a larger stream of tubes for them.
     
  15. tbonesullivan

    tbonesullivan Member

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    I haven't had issues, though I only have the ones that came in my Mesa Maverick, which I think runs them at around 325V on the plates. I also have a Mesa Tested set to go in next when those finally start to get crappy.

    I will say that many have felt that JJ production has slipped. My current amp guy is not a fan, and neither are a lot of other builders.
     
  16. pickaguitar

    pickaguitar 2011 TGP Silver Medalist Silver Supporting Member

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    Does a whistling noise = bad tube
    If so...many JJ's I've bought whistle (maybe it's my amp)
     
  17. tbonesullivan

    tbonesullivan Member

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    Just EL84s, or other tubes? EL84s are prone to mechanical noise from the tubes themselves.
     
  18. pickaguitar

    pickaguitar 2011 TGP Silver Medalist Silver Supporting Member

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    Just the EL84s
    It wants to whistle for the first 10 minutes (annoying af) but then will eventually stop. Perhaps it's just whistling to warm up :)
     
  19. grunf

    grunf Member

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    Does it look like this?
    [​IMG]
     
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  20. HotBluePlates

    HotBluePlates Member

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    Output tubes can ring/oscillate if there isn't a "grid stopper" added (or if it's not a large enough value). A grid stopper is a resistor fitted to a tube socket pin to reduce extreme high frequency; it's used to eliminate radio frequency artifacts.

    Some tubes can ring more than other brands if there's not sufficiently-sized grid stoppers. Maybe your amp is one of those.

    Output tubes usually don't have microphonic ringing the way preamp tubes do. Output tube (or rectifier) microphonics generally sound like a rattle (or like the snares buzzing against the bottom drum head when you play load near a snare drum).
     
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