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My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL34's

Posted: Sun Jan 22, 2012 2:03 am
by doomsdaymachine
First up, the EH 6CA7S.. I biased at roughly 37mV, and immediately noticed their "BIGGER" tone. Fat, nice low end, but a "New Sensor" high end, that I didn't care for. Nice big tone, but somewhat shrill on the high end. Still liked them but wasn't "wowed"..

Next, JJ KT77's.. Big, fat, and warm. Very aggressive sounding, I DO dig these tubes in the JVM. Their aggressive nature makes these a go-to for metal players. If you want a pissed off JVM, these are for you! But, they tend to sound a bit more "modern", than British. Still, a damn fine sounding tube!

On to the JJ E34L.. These have a BRILLIANT midrange to them. NICE mids - very open, yet not overwhelming. I do like, but, they didn't really "wow" me, and found them less aggressive than the KT77's, which is odd, as they say the E34L is more aggressive. I didn't see it.

JJ 6CA7.. This tube sounds PHENOMINAL in the JVM. I absolutely, (loved) these.. But, one went bad very soon after.. Upsetting, because these were EVERYTHING. BIG, FAT tone, THICK bottom end, EL34 growl, and midrange of the E34L's. These were my FAVORITE. But, I'm gun-shy in ordering another pair.. Got them from Eurotubes, and Bob sometimes can be a prick, when you call him & tell him his tubes failed.. I may order another set elsewhere..

Mullard RI EL34's.. These are Marshall tone city! NICE, MIDS, warm, and good thump. Very good sounding tubes, and are in my amp now. Played for 4 hours today, and really loved what I was hearing...Except...That "New Sensor" high end, I spoke of with the EH6CA7's. For some reason, every New Sensor product I try in the power section has a brittle top end, that's tough to dial out! I don't know, I'll keep experimenting.. I'd REALLY recommend the JJ 6CA7's.. Again, I may score another pair!

Hope this helps!

Re: My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL3

Posted: Sun Jan 22, 2012 2:17 am
by ach91
I haven't really used New Sensor power tubes except the 6CA7 that is in my DSL100 right now. I remember hearing some of the NOS 6CA7s were really aggressive tubes and that the EH 6CA7 was the closest thing to getting the NOS 6CA7 tone. The NOS 6CA7 rep of sounding similar to 6550s is what made me go with EH 6CA7s and I like them but I can see why some people might not like them. It's really the same as why people don't like 6550s but I like both tubes. They just sound so aggressive and cleaner. It's definitely not for everyone though.

Re: My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL3

Posted: Sun Jan 22, 2012 3:44 pm
by Bam Bam
I do love the EH 6CA7s in my DSL and I've been dying to hear what they would sound like in the JVM, so thanks for the review, doomsday. I also have the tubes I took out of the DSL when I bought it, which are labeled "Groove Tubes EL34LS aka 6CA7". I'd like to know who the actual manufacturer of these tubes is in case I decide to try them out in the JVM. I'm also selling my DSL very soon and will probably put these tubes back in it so I can have the EH's for the JVM at some later date.

Bam

Re: My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL3

Posted: Wed Jan 25, 2012 12:56 am
by doomsdaymachine
Bam Bam wrote:I also have the tubes I took out of the DSL when I bought it, which are labeled "Groove Tubes EL34LS aka 6CA7". I'd like to know who the actual manufacturer of these tubes is in case I decide to try them out in the JVM.
They're re-labeled JJ's.

Re: My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL3

Posted: Wed Jan 25, 2012 4:10 pm
by Bam Bam
Ah, cool, thanks!

Bam

Re: My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL3

Posted: Thu Feb 23, 2012 4:36 am
by Rahlstin
I tried a set of JJ 6CA7s tonight and dont care for them. To bad casue they look cool lol

Re: My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL3

Posted: Thu Feb 23, 2012 7:47 pm
by Bam Bam
Rahlstin wrote:I tried a set of JJ 6CA7s tonight and dont care for them. To bad casue they look cool lol
What don't you like about them?

Bam

Re: My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL3

Posted: Fri Feb 24, 2012 12:54 am
by Rahlstin
Harsh mids, boomy bottom. Nasal in your face kinda. Just wasnt pleased at all. Im going to try em in my 1959 and see if that amp likes em.

Re: My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL34's

Posted: Thu Jul 25, 2019 2:36 pm
by jazzbanger
I know this is an old thread, but just tried a pair of the new Svetlana El34 (not winged C’s), and they have that very high brittle sound to them...almost like a harsh whistle...that you can’t dial out. Maybe this is inherent in all of these new sensor made tubes? Would love some =C=‘s!

Re: My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL34's

Posted: Thu Aug 01, 2019 6:07 am
by MonstersOfTheMidway
My 2008 410H came with relabeled SED Winged =C= EL34 power tubes, which served me very well. The only thing I don't like about the SED Winged =C= EL34 power tube is the price (yes, I know what's become of the company, etc., etc., etc.) For me, the SED Winged =C= EL34 power tube is the tube I use to measure up all other tubes. The SED Winged =C= EL34 power tube had an excellent low end projection that stayed very tight at any volume level and in any channel/mode. The reliability for me also was excellent.

My current power tube in my stock 410H is the JJ E34L. I was surprised to find that the E34L power tube is very similar to the SED Winged =C= EL34 in low end sound qualities: tight low end that doesn't get flubby at any volume and/or any channel/mode. As far as reliability goes, I've had these in for a few months now and no problems, though a few months is hardly enough time. Still, these JJ E34L biased very easily in my 410H and there was very little bias drift after a few hours of use.

I've tried other brands in the 410H with really good results. Other brands I like (all current production) are Eletro-Harmonix EL34, Tung-Sol EL34B, Mullard EL34. I'm very curious to try the Shuguang EL34-B in the 410H.