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Post by kurtsstuff on Nov 4, 2005 1:28:26 GMT -5
I know this question has been asked several times but nobody has ever answered it...Is it just a matter of adjusting the Bias to install EL34's or is it more involved than that??..I'd really like to know and would appreciate somebody giving a heads up on this....Thanks!!
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Post by tubetone on Nov 4, 2005 6:39:20 GMT -5
i emailed scott at splawn amps about this,and he told me the bias circuit has the be changed..
so it involes a mod to your amp..i did try and syudy this but i cant find any schematics of splawn amps noware,,if anybody as a schematic please share!!!
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Post by hamerfreak on Nov 25, 2005 11:00:59 GMT -5
I did this to my PM and all you need to do is swap R30 to a (1/2 watt minimum) 22k resistor.Then you rebias and you're set.I put in the Mullards and it sounds great.
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Post by tubetone on Nov 25, 2005 15:42:57 GMT -5
really thats all you need to do,,,oohhaa i think ill take out my soldering gun tonight..
thanks hamerfreak,,,,,just let me know if there's anything els involed....
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Post by hamerfreak on Nov 26, 2005 16:13:01 GMT -5
That's all there is to it dude.Enjoy!
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Post by tubetone on Nov 27, 2005 6:33:07 GMT -5
cooll man,,,witch one is the adjustable pot for biasing is it the one with a tiny gold screw are the one with a bigger white screew..
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Post by hamerfreak on Nov 27, 2005 14:15:07 GMT -5
The bias pot is the one with the tiny gold screw.Don't mess with the other one.
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Post by tubetone on Nov 27, 2005 18:28:29 GMT -5
you the man,,thanks a whole lot!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Post by tubetone on Nov 28, 2005 6:04:49 GMT -5
i did it!!! it was fairly easy it took me about 15 min,i put svet c logo el34,the first thing i noticed is less bass,the punch is still the same the mids are allot sweater it sounds more vintage i would say,,i like it allot..
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Post by tubetone on Nov 28, 2005 6:09:05 GMT -5
i biased my tubes at 32ma witch was 64ma each side using pin #3 and the center tap of the transformer,actualy one side was a bit higher like 34ma .i think thats about right with the el34's are can i go any higher?
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Post by DonaldDemon on Nov 30, 2005 10:54:09 GMT -5
I would try that but everything I tried to modify I have killed! (DS-1 and Dunlop wah GCB-95). My other gripe with doing that is that the transformer is optomized for KT88's so it may not sound as good. Scott said it will not sound like a Quick Rod no matter what modification you do. I would say if you go that far you may as well just sell it and order a QR!
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Post by hamerfreak on Nov 30, 2005 19:31:23 GMT -5
Well if that is the case that whatever mod you do will not make it sound like the Quick Rod,then several people including Scott,have lied to me in saying that the 2 amps' circuits are identical except for the tubes and transformers.
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Post by tubetone on Dec 1, 2005 4:31:06 GMT -5
yea they lied to me too, all i keep hearing is that the pro mod and the quick rod are the same circuits the same transformer only the tubes are different...now what the hell? did scott lie to us? i hope not i was really liking him!!
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Post by hamerfreak on Dec 1, 2005 6:39:21 GMT -5
Well regardless,my amp sounds great with the EL34's and was told more than once on Saturday night that my tone was the best they ever heard.There's no way the KT88's sound better in mine.The response is so much better now IMHO.
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Post by DonaldDemon on Dec 1, 2005 9:56:45 GMT -5
Well if that is the case that whatever mod you do will not make it sound like the Quick Rod,then several people including Scott,have lied to me in saying that the 2 amps' circuits are identical except for the tubes and transformers. Nobody lied to you, the circuits are identical but the differnces in the transformers is what distinguished the two. There's nobody to blame for this misunderstanding. I think people get information and interpret it into the limits of what they understand. I am sure the mods will get you close to the Quick Rod sound because they are the same circuits but unless you change the transformers (which would not be worth the cost) it will not sound the same as if you had a Quick Rod. The mids will always be a bit more smoother on the Pro Mod if I am correct. And the Pro Stock & QR are exactly the same with the exception of a clean channel on the QR. Hope that clarifies this issue. |
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