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EL34/6CA7 for 50W Super Lead

1/20/2001 8:54 PM
Sean Weatherford
EL34/6CA7 for 50W Super Lead
Hello All,  
A friend of mine has asked me to help him retube his Marshall Super Lead (50W). He wanted me to add a gain stage =:-o but I have talked him out of it. :) I need some input regarding current production EL34/6CA7. Does anyone currently make a 6CA7 that truly is a beam tetrode as opposed to the EL34 pentode?  
He currently has Sovtek EL34's and 12AX7's. I'm going to give hime some of my Telefunken 12AX7's for the preamp, but I need some power tube advice. I have NO experience with the EL34/6CA7. Never been a Marshall man.  
I'm interested in the Yugo 6CA7, the Svetlana EL34 and perhaps the new Electro-Harmonix EL34EH tube.  
Sean Weatherford  
Central, SC
1/21/2001 2:14 AM
Dai Hirokawa

I think the Ei(Yugo) 6CA7 is a beam type. And their "KT77" or "EL34" also(whatever they are marking them w/also looked like a beam tube). I've seen a Ei 6CA7 and Ei KT77 side by side, and the KT77 had a skinnier bottle, full base, and a nipple on top. Have never tried these in my Marshall, however. I think Sovtek used to offer a 6CA7 which sort of looked like a "fat bottle" American 6CA7. The ones I saw looked pretty sloppily built, though(a small rectangular piece that should have been punched out of the plate was still dangling on("hanging chad"? Oh no!).  
p.s. I personally like Svetlana EL34s in my Marshall. Good cost/performance.  
Dai Hirokawa
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1/22/2001 5:49 AM

not sure if the RUBY STR-EL#$B is a beam type, but it's supposed to be a clone of the Sylvana 6ca7, which IS a beam type... they do sound pretty damn close to the Sylvanias if you ask me!
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