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

All about tube choices for the JVM series. See workbench for biasing and tube problems you may have.

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

Post by doomsdaymachine » Sun Jan 22, 2012 2:03 am

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!
'67 RI Gibson Classic White Flying V w/Duncan Distortions
Gibson Les Paul Studio 50's Honeyburst w/Duncan Distortions
Marshall JVM205H
Randall RT2X12 Cab w/Eminence Swamp Thangs
Maxon OD808
ISP Decimator
MXR Black Label Chorus
MXR Phase 90
Boss DD-3 Delay

ach91
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Re: My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL3

Post by ach91 » Sun Jan 22, 2012 2:17 am

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.
Here's whats under the hood. I have some personal tweaks to these mods but here's generally what I have going on my amps per Andy's request.

JVM 410H:
-2203 modded OD1 and OD2 (see Casey's mods)
-Plexi modded Crunch channel (see Casey's mods)
-2203 negative feedback mod (see Casey's mods)
-6550 power section
-4H choke (plan on switching to 3H MM choke eventually)
-100uF caps on the screens (see Casey's mods)

Haze 40 C:
-Hotrodded JCM 800 mod (see "Convert Haze 40 into JCM 800" thread in Other Amps section)

DSL 100:
-No mods yet.

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

Post by Bam Bam » Sun Jan 22, 2012 3:44 pm

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
Guitars: 2012 Ibanez 25th Anniversary RG3 w/Dimarzio D-Activator/Air Norton S, 2005 Charvel USA Custom Shop Pointy Head Reissue w/80's Jackson J-95/Duncan '59, 2010 Charvel Pro Mod San Dimas Style 1-2H w/Custom Custom/Jazz (was JB/'59 stock), 1987 Kramer Aerostar ZX30 w/Dimarzio Super Distortion/EMG Selects (passive single-coils)
Amps: JVM 410H (2007), EVH 5150III 50w head (2011), Peavey Series 2600 Mark III
Cabs: Avatar Contemporary 4x12 loaded with Hellatone 60s (Vintage 30s), Early 80's Peavey 2x12 loaded with Eminence Governors
Pedals: ISP Decimator, Morley Mark Tremonti Wah, Fulltone OCD (4th gen), Digitech Whammy (5th gen), MXR 10-Band EQ, Boss DD-3 Delay, Boss BF-3 Flanger, Korg Pitch Black Tuner, others

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

Post by doomsdaymachine » Wed Jan 25, 2012 12:56 am

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.
'67 RI Gibson Classic White Flying V w/Duncan Distortions
Gibson Les Paul Studio 50's Honeyburst w/Duncan Distortions
Marshall JVM205H
Randall RT2X12 Cab w/Eminence Swamp Thangs
Maxon OD808
ISP Decimator
MXR Black Label Chorus
MXR Phase 90
Boss DD-3 Delay

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

Post by Bam Bam » Wed Jan 25, 2012 4:10 pm

Ah, cool, thanks!

Bam
Guitars: 2012 Ibanez 25th Anniversary RG3 w/Dimarzio D-Activator/Air Norton S, 2005 Charvel USA Custom Shop Pointy Head Reissue w/80's Jackson J-95/Duncan '59, 2010 Charvel Pro Mod San Dimas Style 1-2H w/Custom Custom/Jazz (was JB/'59 stock), 1987 Kramer Aerostar ZX30 w/Dimarzio Super Distortion/EMG Selects (passive single-coils)
Amps: JVM 410H (2007), EVH 5150III 50w head (2011), Peavey Series 2600 Mark III
Cabs: Avatar Contemporary 4x12 loaded with Hellatone 60s (Vintage 30s), Early 80's Peavey 2x12 loaded with Eminence Governors
Pedals: ISP Decimator, Morley Mark Tremonti Wah, Fulltone OCD (4th gen), Digitech Whammy (5th gen), MXR 10-Band EQ, Boss DD-3 Delay, Boss BF-3 Flanger, Korg Pitch Black Tuner, others

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

Post by Rahlstin » Thu Feb 23, 2012 4:36 am

I tried a set of JJ 6CA7s tonight and dont care for them. To bad casue they look cool lol
1999 Marshall 100w SLP-ri
2011 Marshall JVM410H
2005 Marshall DSL100
1990 Marshall JCM900 A Cab w G12M 25w
1990 Marshall JCM900 B Cab
2010 Traynor 2w/12w DH15 DarkHorse Head and 1 x12 cab w G12M
2011 Gibson LesPaul Traditional - Black
1976 Gibson LesPaul Custom - Natural
2001 Am Fender Strat-Wilkenson Trem
1984 Washburn G-IV
1992 Lt-ed Ovation Acoustic
2010 Epiphone Sheraton II
And a collection of other crap...
On Facebook search for "Wheelerdealerrocks" Im the heavier guy with glasses and the Hat.. stage L

Bam Bam
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Posts: 3936
Joined: Sat May 29, 2010 9:06 pm
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Re: My findings: JJE34L, JJ6CA7, EH6CA7, JJKT77, Mullard EL3

Post by Bam Bam » Thu Feb 23, 2012 7:47 pm

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
Guitars: 2012 Ibanez 25th Anniversary RG3 w/Dimarzio D-Activator/Air Norton S, 2005 Charvel USA Custom Shop Pointy Head Reissue w/80's Jackson J-95/Duncan '59, 2010 Charvel Pro Mod San Dimas Style 1-2H w/Custom Custom/Jazz (was JB/'59 stock), 1987 Kramer Aerostar ZX30 w/Dimarzio Super Distortion/EMG Selects (passive single-coils)
Amps: JVM 410H (2007), EVH 5150III 50w head (2011), Peavey Series 2600 Mark III
Cabs: Avatar Contemporary 4x12 loaded with Hellatone 60s (Vintage 30s), Early 80's Peavey 2x12 loaded with Eminence Governors
Pedals: ISP Decimator, Morley Mark Tremonti Wah, Fulltone OCD (4th gen), Digitech Whammy (5th gen), MXR 10-Band EQ, Boss DD-3 Delay, Boss BF-3 Flanger, Korg Pitch Black Tuner, others

Rahlstin
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Joined: Wed Nov 30, 2011 2:17 am
Location: Lethbridge, Alberta

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

Post by Rahlstin » Fri Feb 24, 2012 12:54 am

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.
1999 Marshall 100w SLP-ri
2011 Marshall JVM410H
2005 Marshall DSL100
1990 Marshall JCM900 A Cab w G12M 25w
1990 Marshall JCM900 B Cab
2010 Traynor 2w/12w DH15 DarkHorse Head and 1 x12 cab w G12M
2011 Gibson LesPaul Traditional - Black
1976 Gibson LesPaul Custom - Natural
2001 Am Fender Strat-Wilkenson Trem
1984 Washburn G-IV
1992 Lt-ed Ovation Acoustic
2010 Epiphone Sheraton II
And a collection of other crap...
On Facebook search for "Wheelerdealerrocks" Im the heavier guy with glasses and the Hat.. stage L

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

Post by jazzbanger » Thu Jul 25, 2019 2:36 pm

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!

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

Post by MonstersOfTheMidway » Thu Aug 01, 2019 6:07 am

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.

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