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EL34 vs E34L (Read 8183 times)
SteveC
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EL34 vs E34L
04/10/13 at 19:26:15
 
This is for the tube rollers out there.  

I got my torii mk3 a couple years ago.  It came with JJEL34s and  JJ6922s.   Something has bee off lately, so I decided to order some new tubes.  Got E Harmonix 6922s and JJE34L's.    (not EL34)

I didn't know they existed or there was a difference.  I laughed thinking some worker had too much Russian Standard Vodka, went to work, and transposed the letters in the machine that paints the numbers on the tubes.  E34L vs EL34.

Anyway, there was a considerable difference.  The torii was louder and sounded "different".  so I searched and learned that the E34L is a EL34 that burns a little brighter (and maybe shorter?)... which lines up with my perception of more power.

I still had the boxes from the old tubes.. the "matched quad" numbers were 24/4.6  and the new E34Ls are 38/5.8.  I don't know tube testing well, but if these numbers mean how many electrons are passed for a given input, then the new tubes are "stronger".  

Anyway, I'm getting used to the new sound.  Again, it's different.  Maybe I got more on the high and low end, but lost something in the middle.  It's overall better than it was, but seems like the quality in sound just shifted around somewhat.  know what I mean?

I've seen other talk about various el34's and 6ca7's... technically, they are the same tube.. same specs.  the E34L is different.

Does anyone else have thoughts/experience with E34L's vs EL34's?

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RoyMercer
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Re: EL34 vs E34L
Reply #1 - 05/05/13 at 00:40:55
 
I have not heard of the E34L. Very Interesting and something to look into. †I would like to point out that American 6CA7's are beam tetrodes, where El34's are pentodes. Although the two types are generally interchangeable, it is my understanding that the suppressor grid is connected to the cathode inside of a beam tetrode. As a result I donít think the 6CA7 will take advantage of Steveís Hazen Grid mod.

Someone please correct me if I am wrong. I almost bought some NOS 6CA7 Fat Boys for my Torii but decided against it because of this.
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Velodyne SMS-1, DSPeaker Anti-mode 2.0, Decware Torii MK3, Dynaco MK3 Mono, Outlaw 7500, Modwright Oppo 95 & 105, Decware HDT's, Klipsch RC64 II, RS62 II's, QSC RMX 4050, 2 Danley Sound Labs DTS-10ís, P5 power plant, Powervar ABC3030, ABCE1440 & 30+GIK traps.
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SteveC
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Posts: 110
Re: EL34 vs E34L
Reply #2 - 05/05/13 at 01:23:11
 
You're right.  I've read more about 6CA7's after my post and learned exactly what you just said.

I was just surprised by my E34L's.   The new tubes came from Decware so they must be "approved"  :)     the sound is slightly different.  I'm used to it now.    happy.
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will
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Re: EL34 vs E34L
Reply #3 - 05/05/13 at 01:35:17
 
Some "6CA7s" are apparently tetrode and some pentode. I understand that the JJ 6CA7 and Shuguang Treasures are Pentode and utilize the Hazen Grid mod. I have seen this spec with the JJs and Steve would not have sold Shuguangs as an upgrade had they not utilized the mod. The EH 6CA7 appear to be tetrode so presumably do not use the mod.

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Mac mini, Tranquility DAC, CSP3, TORII MkIV, Morrow SP-7, HR-1s...VHaudio DIY, Grover, MAC ICs...PSAudio P5 and Shunyata Defender, PI Audio and DIY power cables, HerbiesAudioLab isocups and tube dampers...
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Lon
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Re: EL34 vs E34L
Reply #4 - 05/05/13 at 03:52:24
 
That's exactly my experience as well, the JJ DO seem to take advantage of the CCM, the EH don't.
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Decware:ERR,HR-1,ZP3,CSP2+,Torii Mk III,PS Audio PWT+DS,
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RoyMercer
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Re: EL34 vs E34L
Reply #5 - 05/05/13 at 19:49:26
 
Thanks guys, good to know. †You are referring to current production tubes. I assume they are using 6CA7 in place of EL34 as a marketing scheme.
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Velodyne SMS-1, DSPeaker Anti-mode 2.0, Decware Torii MK3, Dynaco MK3 Mono, Outlaw 7500, Modwright Oppo 95 & 105, Decware HDT's, Klipsch RC64 II, RS62 II's, QSC RMX 4050, 2 Danley Sound Labs DTS-10ís, P5 power plant, Powervar ABC3030, ABCE1440 & 30+GIK traps.
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will
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Re: EL34 vs E34L
Reply #6 - 05/05/13 at 20:26:07
 
Yes the JJ and Shuguangs are current. I don't recall what the differences with EL34s are technically, but construction and sound are a little different at least with the JJs (I have not tried the Shuguang)...I suspect they are like other tubes, current production attempts to capture qualities of favored NOS tubes...I think they are EL34 compatible, but not EL34s.

Of my many power tubes, I keep falling back on the cryoset JJ6CA7s as a standard in my Torii MkIII. For me anyway, I would not consider it a marketing scheme, but a sound choice.
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« Last Edit: 05/05/13 at 20:26:56 by will »  

Mac mini, Tranquility DAC, CSP3, TORII MkIV, Morrow SP-7, HR-1s...VHaudio DIY, Grover, MAC ICs...PSAudio P5 and Shunyata Defender, PI Audio and DIY power cables, HerbiesAudioLab isocups and tube dampers...
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Lon
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"Love without
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worthless!"
Philip K. D*ck

Posts: 7680
Re: EL34 vs E34L
Reply #7 - 05/05/13 at 21:12:09
 
Those JJs are my tube of choice as well, I too don't see them as a marketing scheme but a very solid and great-sounding new production tube.
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Decware:ERR,HR-1,ZP3,CSP2+,Torii Mk III,PS Audio PWT+DS,
PowerBases,PPP,AC-12 pcs, Denon DBP-A100, Denon DCD-A100,Rega RP3 +TTPSU,white belt+Exact2, VooDoo Cable:Evo,Ultra Linear, Iso-PodMapleshade:Double Heiix Plus.Samsonv2+v3 +4" platforms,Herbie's Iso-Cup
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Pale Rider
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Posts: 1272
Re: EL34 vs E34L
Reply #8 - 05/07/13 at 16:56:13
 
Roy, not sure what you mean by "marketing scheme," but the cryo JJ 6CA7 have become my tube of choice in the Toriis.

I have tried Shuguang Treasures and Psvane T-II, both very nice, but not sufficiently better to justify the price differential.
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Decware: Ultra | Torii MKIII [2] | SE84ZS | Taboo MkIII Sources: Synology 1812+ | Baetis Revolution | PWD DAC MKII | Lumin Network Player | Mytek 192 | Oppo 105 DSP: DEQX Mate | Emotiva Outputs: ERR [6] + Servo Subs | LCD-2 & other cans
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