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Post by (8^D) on May 23, 2006 0:07:04 GMT -7
Anyone else experience issues with the JJ GZ34 not seating/fitting properly in the rectifier socket (i.e. loose/wobbly, not powering up, needing to be held/pushed before lighting up, etc.)?
Tried other mfg'ers GZ34/5AR4's and they all worked just fine - set well in the socket with no powerup issues. Opened the amp and it's definately not an issue with the socket, wiring, or the retainer clips.
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Post by guitargeorge on May 23, 2006 4:06:19 GMT -7
My amp developed a crackle that I found out was a poorly seated rectifier tube. I removed the chassis and re-tensioned the socket, and pulled up on the bear trap retainer ans re-inserted the tube and have had no problem with it since. I also have a JJ rectifier tube in my MAZ.
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Post by (8^D) on May 23, 2006 9:31:34 GMT -7
My amp developed a crackle that I found out was a poorly seated rectifier tube. I removed the chassis and re-tensioned the socket, and pulled up on the bear trap retainer ans re-inserted the tube and have had no problem with it since. I also have a JJ rectifier tube in my MAZ. Thanks for the reply. Went down the same trouble shoot - chassis/socket/retainer straps and it didn't help. I wonder if they're using a thinner pin...might be slight but enough to make a difference in the seating.
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Post by humphreyaudio on May 24, 2006 20:28:37 GMT -7
Anyone else experience issues with the JJ GZ34 not seating/fitting properly in the rectifier socket (i.e. loose/wobbly, not powering up, needing to be held/pushed before lighting up, etc.)? Tried other mfg'ers GZ34/5AR4's and they all worked just fine - set well in the socket with no powerup issues. Opened the amp and it's definately not an issue with the socket, wiring, or the retainer clips. Yep, Happened to me a week ago. My amp went down to like 1/2 power, then quit altogether. I reached behind and pushed the recto tube around a little and it came back to life. Might be that these need to come with some sort of 'Keeper' installed. Mark Humphrey
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reaper
Junior Member
Posts: 61
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Post by reaper on May 26, 2006 9:50:30 GMT -7
I must just be lucky, mine went in with no problems at all.
Luke
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Post by (8^D) on May 27, 2006 19:49:23 GMT -7
Interesting...
I just popped for a standard Sovtek and it's working like a champ...no issues. Amp/road case got beat around for a few hours in a U-Haul trailer for a road date. Amp didn't even balk when fired up last night.
Don't know what the build diff is w/the JJ's.
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Post by humphreyaudio on May 29, 2006 19:02:42 GMT -7
Interesting... I just popped for a standard Sovtek and it's working like a champ...no issues. Amp/road case got beat around for a few hours in a U-Haul trailer for a road date. Amp didn't even balk when fired up last night. Don't know what the build diff is w/the JJ's. It's not a tube brand thing, it's the socket. the recto needs to be seated properly, and sometimes they come loose just a bit, and the amp won't fire. MH
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Post by mikefleming on May 29, 2006 20:36:44 GMT -7
I've read lately about problems with a smaller pin diameter on recent runs of JJ tubes. For instance, this thread on Weber's tubes board: www.webervst.com/tubes/messages/2842.htmlDo you happen to have a micrometer to check the pin diameters? Mike
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Post by (8^D) on May 30, 2006 8:54:41 GMT -7
Hey Mike.
Thanks for the link. Nice to see my suspicion backed by empirical data. That makes perfect sense...is what I experienced with the new JJ GZ rectifier...the JJ EL84's are loose too but the retainer clips seem to be keeping them at bay. May have to send the GZ back...it's no good to me as is. I switch rectifiers (one cuts headroom, one is standard) depending on the artist or venue...having to overly tweak the socket each time to keep the JJ happy just isn't an option. Especially when there are so many tube options that are a direct plug-n-play.
No, don't have a micrometer available. But, after an exhaustive process of elimination that seems to be the only viable conclusion. The JJ is the only brand of several I've tried that's doing this.
Karma to you for the link.
Thanks!
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Post by mikefleming on May 30, 2006 10:27:18 GMT -7
Thanks bud, right back at you.
Mike
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Post by (8^D) on May 30, 2006 12:54:26 GMT -7
Thanks bud, right back at you. Mike Much appreciated! ;D
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Post by mikefleming on May 30, 2006 19:57:14 GMT -7
By the way, what are you swapping in to cut headroom, a 5U4 or 5V4 maybe? How does the amp's response change besides the headroom difference?
Mike
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Post by (8^D) on May 30, 2006 20:40:08 GMT -7
By the way, what are you swapping in to cut headroom, a 5U4 or 5V4 maybe? How does the amp's response change besides the headroom difference? Mike Hey Mike. I'll have to look at the tube. Can't recall off the top of my head...tubes are stored in a compartment of the pedalboard. The cut tube makes the amp more aggressive...not as smooth, but gets that grease/hair faster for those smaller rooms.
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Post by mikefleming on May 31, 2006 18:42:46 GMT -7
That's cool man. If you ever do get a look at it I'd be curious to hear what it is.
Thanks,
Mike
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Post by (8^D) on Jun 2, 2006 9:17:04 GMT -7
That's cool man. If you ever do get a look at it I'd be curious to hear what it is. Thanks, Mike Hey Mike, tweaking the board a bit for a show and opened the box/paper...it's a PhillipsECG 5V4GA.
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Post by mikefleming on Jun 2, 2006 9:33:41 GMT -7
Cool, thanks for that. Another karma for the favor.
Mike
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Post by tele1962 on Jun 2, 2006 11:59:08 GMT -7
When I got my amp shipped to me, it came with a NOS RCA blackbottom rec. tube. Never a lick of trouble, but I will tell you, I 've heard of some rec. issues with Juniors. Most guys that have had issues, and gone Sovtek ( Russian Sovtek...not the Chinese ones) have had the problems stop. Maybe it is a pin thickness thing, I'm not sure. I also replaced a GE rec tube in an old Fender amp I have a few months ago with a Russian Sovtek, and it's superior to anything that's been in it before.
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Post by nitehawk55 on Jun 21, 2006 19:19:26 GMT -7
From what I see Sovtek has done a good job of making a Mullard copy . If you look you will see they look much the same with the plate design . I've read of some issues concerning problems with the JJ rectifiers on other boards so it's not confined to Dr. Z equipment . My Carr's came equipped with Sovtek 5AR4's BTW , no problems so far although I have been purchasing some NOS USA and British made GZ34's and 5U4B's lately to do some A/B testing just for fun .
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