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In Reply to: RE: folded horn kit posted by robert920rogers@gmail.com on January 13, 2012 at 05:55:30
I don't think there is any intrinsic problem with having those 55 watts.
However, if your amp has any hum, that might become obvious with the more efficient folded horn design.
Follow Ups:
my amp is very quite it is yaquin 10 mc10l "gasp" but I would like to move towards set someday I have really bad tinitus I was a tree surgeon,shooter,folder operator,loud music lover, and now I have learned to love good sound at low level.
Robert,
You are going to love using back-loaded horns with fullrange drivers. I had a man join my online SET group just before he was getting ready to make a complete change in his audio system. Like you Karl has really bad tinitus and just couldn't listen to loud music any longer. One of the most wonderful characteristics about using fullrange drivers in a back-loaded horns is the music retains it's full harmonic, timbrel and tonal balance and it's dynamic swings when played at low volumes just as well as it did at the louder volume levels!
It's the lack of this ability when using other less sensitive speakers that causes people to constantly feel the need to turn the volume up when listening at low volumes where most other speakers make the music sound dull & lifeless! To be honest with you Robert I sincerely believe even using your Yaqin MC-10L amp will allow you to hear much of what you'd expect to hear when using an SET amp with fullrange drivers in a back-loaded horn. Perhaps you'd like to check out this guy in Australia named Joe Rasmussen who modifies the Yaqin MC10L you own? He's using what he calls "Virtual Triode Operation" that you can read about here:
http://www.customanalogue.com/jlti_el34.htm
Joe Rasmussen claims that the MC10L will compete with amps costing many thousands of dollars more when he's done modding it! However, just because it's always nice to read what someone else thinks about a person's work as opposed to what the person themself thinks. Here's a review written of a Joe Rasmussen modified Yaqin MC10L amp:
http://www.digitalaudioreview.net.au/index.php/audio-reviews/amplifier-reviews/item/158-custom-analogue-jlti-el34-power-amplifier
As always Robert feel free to ask any question you might have and I'll help you where I can...
Thetubeguy1954 (Tom Scata )
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
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"The man that hath no music in himself, nor is not moved with the concord of sweet sounds, is fit for treasons, deceptions, and spoils;
The motions of his spirit are dull as night and his affections dark as Hell. Let no such man be trusted."
- William Shakespeare from The Merchant of Venice; Act V,i
Tom I know this is going to sound crazy to you but bear with me on this theroy I have about my experience on tinnitus. I have had a LOT of tinnitus firstly from owning and firing a 458 winchester magnum when I was a teenager and worse still a 358 Norma magnum. The ultimate ear destroyer well I thought until I spent 2 months in hospital having full bags of vancomycin bolised up my arms whith huge syinges because they where to lasy to spend the time hanging them for last resort staphylococci infections. Well that was what one of the hurses told me that I had become freinds with over the years. My foot that time was rotting off. This did far more damage and angers me as it was totally avoidable.
But on a more positive note after being plagued for many years I learned that like severe nerve pain but much more so. tinnitus is a state of mind and the more neurotic you become about it the worse it gets. And of course being an audiophile this can be a hell. Actually I became more serious about my audio as a defense to tinnitus. But I tell you now today my tinnitus is Absolutely cured. No my hearing damage is still there but I have turned of the receptors in my brain that hears it. I DON'T HEAR IT ANYMORE. NOW SUGGESTING THIS TO YOUR FRIEND MUST BE DONE WITH TACT BECAUSE TRUST ME THERE IS NOTHING WORSE THEN BEING TOLD YOUR NEUROTIC OR YOU ARNT IN PAIN JUST PUT IT OUT OF YOUR MIND.
But believe it can be done. You tell your Friend to just stop listening to it and refuse to accept it exists. Just talking about it now mine is breaking through for the first time in years. Trust me it will change his life and bring his music back to him. Perhaps a yogi may help with the mechanics of what I am trying to say. But you can do it. Stop listening for tinnitus stop hearing it. Personally trans coupling in my audio really helps or it did years ago when I was still fighting it. Good luck you dont have to suffer tinnitus. And finally I will tell you another thing that was suggested to me by a hearing specialist neurotic people statistically suffer more often from tinnitus and neuralgia . There is been times. My injuries are all on my right side. That my nerve pain has been so bad that it has cross centerers in my brain to the point my whole right side was on fire A clear line straight down my body in the middle. The whole right side of my body became one big phantom limb pain wise.A burning shrunken miniature of the real right side of my body. Nothing on the left. I nearly topped myself many times. Nerve Pain and tinnitus in your brain is a very subjective fluid thing. It can be controlled by the power of your brain and state of mind believe it. These days I have very little nerve pain at all just bone, joint ,back and some phantom pain remains. What you would expect from complications or my right arm and foot injury.
My right foot was crushed by a falling shelve while shopping for wood for a preamp at a hardware store and my right arm wash smashed by a drunkin driver in a truck side swiping me ten years earlyer at work carting nitriprill to a quary. In case you wonder. Most people want to know. And thats how I get to spend all my time building amps and playing with my child:)
On the other hand I know this sad neurotic woman who is in utter torment off her face on morphine ,eurontin you name it for pain I know that doesn't exist. She spends her whole life going to doctors and telling them she has pain and them not finding it. They tell her she has phybromyalger. What she has is mental illness. She is killing herself. She has the pain. Its all very real to her. Because she wants it on some subconsous level. The last time I visited her within 2 minutes of greeting. She took me in to the next room to show me a self potrait which was severly deformed and all the pain mapped out where she feels it in her body. If she took that painting with her to the doctors I am sure it would dawn on them how mentally ill she is. Such a waste. She is not a hypercondric. The pain is as real to her as anyone in pain. Her brain has created it. Unreal hey. Or I find it facinting. Pain has played a big part of my life and she has taught me a lot how NOT to suffer it.I know if she can create it. I can destroy it. And your Friend can defeat his tinnitus too.
Don't accept tinnitus don't hear it and you will be free. Try to tell him Tom I hate to think he is going through what I did. There is nothing worse then tinnitus ruining your music.I hope this is some help to any of the inmates that suffer. It sure took me long enough to type it with one finger lol
Regards the tiny free T ;)
"However, if your amp has any hum, that might become obvious with the more efficient folded horn design."
With a fully horn loaded driver perhaps, but not with a rear loaded horn. A front loader can run well over 100dB sensitivity, whereas a rear loader's sensitivity is only that of the raw driver. The horn doesn't give broadband gain, just in the lows where a low Qts and/or small Vd driver would have inadequate output otherwise. The Fostex FE126En only has 93dB sensitivity, so hum shouldn't be a problem.
...a 55 Watt EL-34 almost has to be push-pull, probably with some global feedback and consequently, unless an ST-70, not likely to hum.
I will believe corporations are a legal person when Texas executes one!
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