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Old 07-11-2012, 07:11 PM   #1
Lyrax
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Question about the Laney Ironheart. It's about tubes and biasing.

I hope that I put this in the right forum...

I'd like to ask you guys a question.
I have an Ironheart and I'd like to change the tubes from 6L6's to EL34's. Some guy told me that the amp is self-biasing (it has a EL34-6L6 switch in the back), but I'm unsure if I can put some 6AC7's in it without manual biasing. They are a part of the EL34 family after all... Do I have to bias it by myself or can I just put the 6AC7's in and flip the EL34 switch?

http://thetubestore.com/ehx6ca7.html Here is the tube I'd like to put in.

Ola Englund (Six Feet Under, Feared, Scarpoint,Sorcerer) demonstrates different tubes while designing his own signature amp...


Some guy told me that these tubes only put out 3W and dont fit in guitar amps.
The 6AC7EH's are apparently usable in amps.
Electro Harmonix 6AC7 in use seen at: 1:25 and at 4:14
So if I'd like to put the tubes in like Ola Englund, what should I do?
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Old 07-11-2012, 07:39 PM   #2
Cathbard
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6AC7 is just another name for an EL34, like ECC83 is another name for a 12AX7.

Some Guy is a dumbass.
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Old 07-11-2012, 10:13 PM   #3
zero
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The IRT series claims to be self-biasing, but IIRC there is a fair bit of speculation surrounding the specifics, I have been trying to track down schematics for ages.

FWIW I slapped some JJ 6L6GC's in mine (along with jj 12ax7's) - huge improvement. I would be very keen to hear one running EL34's so if you go ahead with it a sound clip would be tops

Last edited by zero : 07-11-2012 at 10:21 PM.
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Old 07-12-2012, 05:27 AM   #4
Lyrax
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So it is possible you think? I really hope that they are self biasing so I don`t get new tubes and can`t use them I mean do they have the same number of pins as normal EL34`s?

Hey! If you have the manual left that came with the amp there is a schematic on the last page ;D
The sound Ola Englund had with the 6AC7EH`s was just massive if you save the video I posted!

Well on the me-posting-a-video matter, this autumn I will be working hard on some material I wrote this summer so it is very much possible that I will post some stuff...
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Old 07-12-2012, 07:08 AM   #5
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I've already told you - they are the same tube. Well, for all practical purposes anyway.
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Last edited by Cathbard : 07-12-2012 at 07:12 AM.
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Old 07-12-2012, 07:47 AM   #6
Lyrax
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Quote:
Originally Posted by Cathbard
I've already told you - they are the same tube. Well, for all practical purposes anyway.

Okey okey, thank you!
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Old 11-15-2012, 10:18 PM   #7
KevinMarchesini
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I'd like to know how it sounds with the el34. Does it change dramatically?
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