Well the balsa wood I got is too soft. I know there are many hardnesses of it. I will have to find a hobby shop and not buy online. Since the various cone treatments I put on a pair of super 8s would not come off, I decided to cut off the cones to look at the construction. The shorting ring is visible.
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Somewhat radical design ... but surely has only little
problems with cone breakup. 😎
This guy makes cones from balsa:
http://www.ennemoser.com/speakers.html
problems with cone breakup. 😎
This guy makes cones from balsa:
http://www.ennemoser.com/speakers.html
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The next light wood is abachi wood
Much stronger than balsa, and still very light
But I agree with tomtt, its also a matter of how you do it
btw, I have used simple coating with polyurethane glue(expanding foam GLUE)
Hard to apply thin and evenly, but its light, and works
Much stronger than balsa, and still very light
But I agree with tomtt, its also a matter of how you do it
btw, I have used simple coating with polyurethane glue(expanding foam GLUE)
Hard to apply thin and evenly, but its light, and works
My friend bought the Atelier Rullit, we mounted them in an open baffle and they are superb.
John
John
I tell you what; I have set ebay to send me anything M. Rullit sez. This is a serious maniac. He has the Vocation.
Poinz
Poinz
Would you post some pictures? What kind of power supply feeds them?
Thanks in advance.
A lot of interesting stuff going on 50-60 years ago on all shores - Harry Olson's LC1B for example
no doubt tomtt could dig up some interesting vintage audio pin-up shots
no pictures
Right now simple solid state supply with variac to find the sweet spot, will change to tube supply eventually, also front loaded horns being built for these drivers to replace the open baffle.
Right now simple solid state supply with variac to find the sweet spot, will change to tube supply eventually, also front loaded horns being built for these drivers to replace the open baffle.
The front horns are Oleg Rullit's propriety design, you can see photos of the horns here.
12" field coil pictures from woodworking photos on webshots
12" field coil pictures from woodworking photos on webshots
Some pictures of the horns for the Rullit drivers:
In the shop before drivers were installed.
John
In the shop before drivers were installed.
John
Hello,
recently I happened to come across this thread on your forum, and I'm very happy to see that the great project of the friend of jlsem's who was lucky, then, to purchase these unique speakers for comparably little money in my eBay auction, is currently being carried on.
Having supplied the plans and instructions, and running an alike front loaded horn in my atelier, I do know what the result will be like. There's nothing comparable to these devices.
@jlsem: Do you know whether the speakers have already been monted? I sent an email to Ka some days ago, but I haven't received an answer so far. I'm keen on getting to know everything about the course of his project. What kinds of amps is he running, what's the signal source? I'm asking because this isn't just a so-called "hifi system", but, if everything has been worked out right, a real time machine that takes you on a journey to the very place and the very time the music was recorded - be it Belafonte in Carnegie Hall, Glenn Gould in Salzburg, or whoever whenever.
One of the forum's members named me a "serious maniac", also using the word "vocation" - he might be right. For quite a lot of years I have been deeply involved in this matter, mainly re-animating old German speaker-"Baukunst" - art of construction, so to speak - and doing research for my own developments.
I suppose there are more members who'd like to know more about my philosophy, my work and my creations. From now on, I will be present in diyAudio twice a week to answer your questions, to share new projects with you, etc.
Kind regards,
Oleg Rullit
recently I happened to come across this thread on your forum, and I'm very happy to see that the great project of the friend of jlsem's who was lucky, then, to purchase these unique speakers for comparably little money in my eBay auction, is currently being carried on.
Having supplied the plans and instructions, and running an alike front loaded horn in my atelier, I do know what the result will be like. There's nothing comparable to these devices.
@jlsem: Do you know whether the speakers have already been monted? I sent an email to Ka some days ago, but I haven't received an answer so far. I'm keen on getting to know everything about the course of his project. What kinds of amps is he running, what's the signal source? I'm asking because this isn't just a so-called "hifi system", but, if everything has been worked out right, a real time machine that takes you on a journey to the very place and the very time the music was recorded - be it Belafonte in Carnegie Hall, Glenn Gould in Salzburg, or whoever whenever.
One of the forum's members named me a "serious maniac", also using the word "vocation" - he might be right. For quite a lot of years I have been deeply involved in this matter, mainly re-animating old German speaker-"Baukunst" - art of construction, so to speak - and doing research for my own developments.
I suppose there are more members who'd like to know more about my philosophy, my work and my creations. From now on, I will be present in diyAudio twice a week to answer your questions, to share new projects with you, etc.
Kind regards,
Oleg Rullit
Hi Oleg,
Great to see you here!
I have to say that I have admired your work from affar. Your drivers are incredible works of art. It is wonderful to see in our modern disposable world. It will be good to understand some of your philosophy on what makes a great driver, as well as your general audio experience.
Best Regards
David
Great to see you here!
I have to say that I have admired your work from affar. Your drivers are incredible works of art. It is wonderful to see in our modern disposable world. It will be good to understand some of your philosophy on what makes a great driver, as well as your general audio experience.
Best Regards
David
Oleg,
The speakers are mounted and are in fact outstanding. The amps are Arthur Loesch designed - single-ended currently using 801A on the output but can be configured for type 50 as well as 300B. The output transformers are Tango NY-series Permalloy core.
The whole system defies every negative myth applied to the single-ended amp/single-driver method.
John
The speakers are mounted and are in fact outstanding. The amps are Arthur Loesch designed - single-ended currently using 801A on the output but can be configured for type 50 as well as 300B. The output transformers are Tango NY-series Permalloy core.
The whole system defies every negative myth applied to the single-ended amp/single-driver method.
John
Hello David and John,
many thanks for your quick feedback. I'm on the move today, but I will be back tomorrow for a more elaborate answer.
I'm up to be in the forum every Monday and Thursday.
Kind regards,
Oleg
many thanks for your quick feedback. I'm on the move today, but I will be back tomorrow for a more elaborate answer.
I'm up to be in the forum every Monday and Thursday.
Kind regards,
Oleg
These are the most realistic speakers I have heard and owned, the massive horn allow every detail and nuance come through, the breath of the singer, the decay of the note of an instrument is uncanny, I am done with searching for speakers, the wood work by master furniture maker jlsem is exquisite.
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