EH 6CA7

The good, the bad and the ugly.

Moderator: VelvetGeorge

EH 6CA7

Postby dtdionne » Mon Sep 28, 2009 8:38 pm

Any opinions?
Late 70's EVH tone or bust
dtdionne
Senior Member
 
Posts: 481
Joined: Sun Oct 21, 2007 1:39 pm

Re: EH 6CA7

Postby Spodeeodee » Mon Sep 28, 2009 8:57 pm

I thought those were no longer being manufactured?
Travis
-Metro JMP50
Spodeeodee
Senior Member
 
Posts: 194
Joined: Sat Nov 22, 2008 12:32 am

Re: EH 6CA7

Postby stratman672001 » Fri Oct 02, 2009 10:47 am

dtdionne wrote:Any opinions?


I had a set of those in my stereo but I didn't even get nine months out of them but YMMV. My JCM 800 has a set of (I think) Sovtek 6CA7s that I put in back in '97 and they still work just fine.
stratman672001
New Member
 
Posts: 13
Joined: Thu Dec 11, 2008 3:28 pm
Location: Bangor, Maine

Re: EH 6CA7

Postby dtdionne » Fri Oct 16, 2009 1:24 pm

EH just started making them again and I really like them...

http://thetubestore.com/ehx6ca7.html

I also have a NOS set of the Sylvania 6CA7's from the 70's and I really can't hear a difference between them...my guess is that the Sylvania's will last much longer though.
Late 70's EVH tone or bust
dtdionne
Senior Member
 
Posts: 481
Joined: Sun Oct 21, 2007 1:39 pm

Re: EH 6CA7

Postby HTH » Fri Oct 16, 2009 1:42 pm

the set I've got sound alot darker than EL34s and sort of sit somewhere between an EL34 and a 6L6. they're not that great of a tube imo, there are better sounding EL34s and 6L6s available currently. if you have a really bright amp, they would be worth a shot though.
"If you can possibly manage the time, please play both sides at one meeting"

http://www.youtube.com/TeleCustom72
User avatar
HTH
Senior Member
 
Posts: 600
Joined: Thu Nov 27, 2008 9:53 am
Location: Newcastle, UK

Re: EH 6CA7

Postby Grosh_Guitars » Sat Nov 07, 2009 12:16 pm

I was also gonna ask about these.

Here's a review I found..

Electro Harmonix 6CA7-EH - At last something to replace the hole left since the EI 6CA7 went out of stock. These tubes sound every bit as good as the old EI tubes and are probably my favorite tubes for Hiwatt guitar amplifiers. It’s like they were made for each other. These tubes are like EL34’s on steroids. They handle high voltage and current without problems. As mentioned, there is nothing like a Hiwatt head powered by 6CA7 tubes and driving a 4x12 cab loaded with Fane speakers. This is classic rock tone at its finest. It’s the sound of Pete Townsend and The Who. The 6CA7 has more headroom than an EL34 and by the time you get it really crunchy sounding your pants are flapping in the breeze. Just the right amount of compression for great thick rock tone. Biasing levels can be dialed in from warm to hot without causing significant tonal changes. The EH is well constructed and should not pose any noise problems. If using these tubes in more reasonable systems the EH 6CA7 is capable of some really nice clean tones thanks to that extra headroom. If you want early Van Halen, these are not the tubes for you. If you want something loud and proud, you want to put the EH 6CA7 in your amp.
User avatar
Grosh_Guitars
Senior Member
 
Posts: 997
Joined: Tue Oct 24, 2006 9:11 am
Location: Longmont CO. by way of Southern CA.

Re: EH 6CA7

Postby brett s » Sat Nov 07, 2009 9:28 pm

My modded JCM800 likes them better than the other new production EL34's I've tried so far - been running them a couple years now.
brett s
New Member
 
Posts: 6
Joined: Thu Oct 25, 2007 7:52 am

Re: EH 6CA7

Postby Doug H » Sun Nov 08, 2009 1:12 pm

I got a pair but they were too mismatched to use. I've got one in with a tung sol (I broke the other tung sol in the trunk) and my amp sounds as good if not berter than it ever sounded.
User avatar
Doug H
Senior Member
 
Posts: 835
Joined: Tue Jan 22, 2008 3:56 pm
Location: Canada

Re: EH 6CA7

Postby Grosh_Guitars » Sun Nov 08, 2009 2:10 pm

what's amazing to me is all the guitar players that would want 6CA7's why is it that no tube manufacture makes them anymore? I know GT use to make them. weird. Seems like there would be a market for them.
User avatar
Grosh_Guitars
Senior Member
 
Posts: 997
Joined: Tue Oct 24, 2006 9:11 am
Location: Longmont CO. by way of Southern CA.

Re: EH 6CA7

Postby Structo » Sun Nov 08, 2009 2:57 pm

So is a 6CA7 the same tube as the EL34?

In looking at some spec sheets for it, it seems there is a wide disparity between data sheets as to how much power they dissipate.

So I am wonder if EHX is simply putting a 6CA7 label on their EL34.
Tom

Don't let that smoke out!
User avatar
Structo
Senior Member
 
Posts: 1219
Joined: Mon Jun 08, 2009 7:07 pm
Location: Salem, Oregon

Re: EH 6CA7

Postby demonufo » Sun Nov 08, 2009 5:44 pm

Well a true 6CA7 is a beam tetrode as opposed to a pentode. The plates are larger, the cathode is larger, the vacuum is stronger. There are a few more differences, but it was designed to be fully compatible with EL34's as far as I know.
I believe it will handle screen voltage better than many EL34's too.
As for them being the same tube, well hardly.

The EH's though, I've never looked at, but the construction appears to be correct for a 6CA7 as far as I can make out.
So I like purple, okay!!!!!!

83.7% of all statistics are made up on the spot!
User avatar
demonufo
Senior Member
 
Posts: 3847
Joined: Thu Dec 13, 2007 9:36 am
Location: Carterton, Oxon, U.K.

Re: EH 6CA7

Postby Roe » Mon Nov 09, 2009 5:26 am

a 6ca7 def sounds different from a el34. I got a pair of sylvanias in my comet k60 clone. they kill in that application. I prefer higher Zs with this tube - the komet is 5.8k.
from what I hear none of the newer 6ca7s comes close to the sylvanias.
http://www.myspace.com/20bonesband
http://www.myspace.com/prostitutes
Super 100 amps: 1202-119 & 1202-84
JTM45 RS OT JTM50 JMP50 1959/2203/34/39
Roe
Senior Member
 
Posts: 4656
Joined: Thu Apr 13, 2006 1:36 pm
Location: Drontheim. Norwegen

Re: EH 6CA7

Postby Structo » Wed Nov 11, 2009 7:23 pm

Grosh_Guitars wrote: I know GT use to make them. weird. Seems like there would be a market for them.


No offense but I don't believe GT ever made a tube.

They simply imported them and slapped their label on them.

Even the purported GE 6L6 that Pittman was going to make in California, turned out to be an untruth, (to put it mildly) which was assembled in China.

In his first publicity he stated these were made in the USA.
Only later to renege on that description because somebody called him on it.

No tube can be made in the USA as far as I know since many of the chemicals and elements are very hazardous and bad for the environment.

But old Aspen was pretty clever in selling his operation to Fender a year or so ago.
Tom

Don't let that smoke out!
User avatar
Structo
Senior Member
 
Posts: 1219
Joined: Mon Jun 08, 2009 7:07 pm
Location: Salem, Oregon

Re: EH 6CA7

Postby Kinkless Tretrode » Sat Nov 14, 2009 9:21 pm

According to somebody close to the project, the GT 6CA7 attempt was a complete debacle, and they should be avoided like the plauge. Most didn't last a day. I don't know where it was made.
Kinkless Tretrode
New Member
 
Posts: 18
Joined: Tue Dec 02, 2008 10:16 am

Re: EH 6CA7

Postby Doug H » Tue Jan 12, 2010 12:48 am

so I got a refund and got another set, these bias up perfectly. They sound nowhere as thick as the tungsol el34b IMO and have that trashy EH top end I've come to expect from their 12ax7s. Not much bottom, I'm not sure I like these much. Maybe I got a bum set. Putting these in coinsides with changing my mix resistors from 270 560 ro 470 500, maybe that's got something to do with it.

I've only played them for a hour or so.
User avatar
Doug H
Senior Member
 
Posts: 835
Joined: Tue Jan 22, 2008 3:56 pm
Location: Canada

Next

Return to Tubes

Who is online

Users browsing this forum: No registered users and 2 guests