Hi, Anyone have any experience listening to single ended el-34 amps. Thinking single ended for first project and I have a bunch of EL-34's. I got the idea from a schematic on Angela. I would probably mate it to some 1982 Heresy's I have and use either a stock pas 3 or older H-K preamp until I could buil a phono pre. Oh by the way I listen almost excusively to bluegrass, usually female voice. Thanks in advance for any and all opinions or advice.
Before you build any SE amp with EL-34's, read this:
http://www.lundahl.se/pdfs/claus_byrith/cb-amplifier_8wse.pdf
I have built a similar design on a breadboard. I have been torturing sweep tubes in it and will eventually get to EL-34's. It sounds really good with $3 sweep tubes.
http://www.lundahl.se/pdfs/claus_byrith/cb-amplifier_8wse.pdf
I have built a similar design on a breadboard. I have been torturing sweep tubes in it and will eventually get to EL-34's. It sounds really good with $3 sweep tubes.
I built a bastardization of the Angela El34 and the
http://www.lundahl.se/pdfs/claus_by...lifier_8wse.pdf
Tube recification, CLC filter, I sprung for the Lundahl OT's, used the cathodes tied to the OT scheme, no feedback, and didn't need the Ultralinear connection as the amp is used to power a pair of efficient LaScala's (ALKs Crossovers). I used 440 ohm resistors to set the bias insead of 880 ohms, this sets the bias at 61 ma. The Hammond OT's Angela suggest are kinda crappy. The Lundahl's give really deep bass extention which you will appreciate wth the Heresey's.
BTW if you use the cathode through the OT connection, you MUST ground the negative side of the output trannys.
I would use a stouter PT than the Angela build as it gets very hot at this bias setting.
I gave the amp to my brother as a vacation house warming present and it is very nice, may have to do one for myself.
dr._sleep
http://www.lundahl.se/pdfs/claus_by...lifier_8wse.pdf
Tube recification, CLC filter, I sprung for the Lundahl OT's, used the cathodes tied to the OT scheme, no feedback, and didn't need the Ultralinear connection as the amp is used to power a pair of efficient LaScala's (ALKs Crossovers). I used 440 ohm resistors to set the bias insead of 880 ohms, this sets the bias at 61 ma. The Hammond OT's Angela suggest are kinda crappy. The Lundahl's give really deep bass extention which you will appreciate wth the Heresey's.
BTW if you use the cathode through the OT connection, you MUST ground the negative side of the output trannys.
I would use a stouter PT than the Angela build as it gets very hot at this bias setting.
I gave the amp to my brother as a vacation house warming present and it is very nice, may have to do one for myself.
dr._sleep
Thanks men, What a great paper! I'm going to have to read it a couple more times to soak more thru the bony part of my head, but I new it was good from the first page where he talks about the advent of stereo and how it affected circuit and build quality. I'm one of those who beleives technology does not always go forward. Can someone point me to a good place to get the Luhndahl? opt,s. I think I have a ipt that may work, I just have to dig for it. A couple more ?s I have are 1) Is there anything wrong with building this on a homebuilt copper chassis? 2) I think I have enough NOS western electric capacitors and 1% resistors for this amp. They are all in sealed military packaging from the late 50's. I acquired a huge box and everything I opened and tested so far is right on the money, but I know caps can degrade. Last thing is the final schematic was kinda washed out looking when I printed the paper off and I can Hardley read it. I wandered if this was done on purpose and maybe it would somehow be wrong to use it. (intellectual property?) This probably sounds like a stupid question but I won't be sure if I don't ask
Anyhow thanks for all the help. I may have actually found a mentor, I went to look at a large lot of tube test equip. today and met the owner, a 91 year old gentleman who worked as an electronics tech for armed forces and then had a TV shop after retiring. He suffered a stroke and can,t do much with his hands anymore but is still sharp as a tack. He said he would love to show me how to operate the different equip. (sig gen. , scope, etc etc.). I think it will be great for both of us! Thanks Again, Jay
Anyhow thanks for all the help. I may have actually found a mentor, I went to look at a large lot of tube test equip. today and met the owner, a 91 year old gentleman who worked as an electronics tech for armed forces and then had a TV shop after retiring. He suffered a stroke and can,t do much with his hands anymore but is still sharp as a tack. He said he would love to show me how to operate the different equip. (sig gen. , scope, etc etc.). I think it will be great for both of us! Thanks Again, JayHere's the link to the higher resolution schematic from the Lundahl site: http://www.lundahl.se/pdfs/claus_byrith/cb_seamp.jpg
dr._sleep
dr._sleep
jaymanaa said:
Yes I did. A unit from TS AUdio in Thailand and being re-sold by NORH - http://www.norh.com/products/se9/index.html
It sounds good enough, but still needs a higher sensitivity speaker.
Originally posted by jaymanaa
I may have actually found a mentor, I went to look at a large lot of tube test equip. today and met the owner, a 91 year old gentleman who worked as an electronics tech for armed forces and then had a TV shop after retiring. He suffered a stroke and can,t do much with his hands anymore but is still sharp as a tack. He said he would love to show me how to operate the different equip. (sig gen. , scope, etc etc.). I think it will be great for both of us! Thanks Again, Jay
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this is perhaps the most-great event that could
ever happen' to a diyer.
maybe you could also use an el34 to drive an el34,
as tube hero Susumu Sakuma suggests-
http://www10.big.or.jp/~dh/sakuma/index.html
I may have actually found a mentor, I went to look at a large lot of tube test equip. today and met the owner, a 91 year old gentleman who worked as an electronics tech for armed forces and then had a TV shop after retiring. He suffered a stroke and can,t do much with his hands anymore but is still sharp as a tack. He said he would love to show me how to operate the different equip. (sig gen. , scope, etc etc.). I think it will be great for both of us! Thanks Again, Jay
``````````````````````````````````````````````````
this is perhaps the most-great event that could
ever happen' to a diyer.
maybe you could also use an el34 to drive an el34,
as tube hero Susumu Sakuma suggests-
http://www10.big.or.jp/~dh/sakuma/index.html
Hey Tom, Nice to see a fellow KC guy here. The gentleman I'm hoping to spend a lot of time with worked at Bendix on Bannister. I bet he has some stories as well as his knowledge of electronics. By the way, do you know of any good elctronics parts stores in the KC area besides KC Electronics or Rat Shak? Enjoy the weather while it lasts! Jay
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