6S19 Circlotron (OTL) - Page 3

korneluk · 25th March 2008, 05:57 PM

Quote:

Originally posted by Zero Cool
I have TWO of Ralph Karsten's (Atma-Sphere) early prototype Circlotron amps!!! Both use 8 6AS7G tubes per channel.

ZC,

Which model amp is that on the picture?

BTW, I have been talking to Ralph about the upcoming OTL kits he plans to start selling again.

-- josé k.

Fuling · 25th March 2008, 08:49 PM

John Broskie (tubecad) offers a solution for the symmetric feedback issue:
http://www.tubecad.com/december2000/page14.html

I like the idea of the "quick, short feedback loop" that "greatly reduces the output impedance and lowers the distortion of the amplifier".
Making the feedback a local business for the output stage seems like a good idea to me.

Fuling · 23rd July 2008, 11:32 PM

After a few months of salmon fishing and RC flying I´m getting back on the DIY audio track again. Instead of finishing some of my half-built projects I feel it´s time to start working on the circlotron.
Due to the number of tubes and power supplies I will build it as mono blocks and to save a few hours I will "borrow" some chassis parts from an earlier OTL project that probably never will be finished.

I will employ John Broskies output stage topology (see link in the previous post) with 1x 6N6P and 8x 6C19 per channel plus another 6N6P as an LTP input/phase splitter.

http://www.mif.pg.gda.pl/homepages/f...13/6/6S19P.pdf

http://www.tubes.ru/techinfo/HiFiAudio/6n6p.html

I´ve spent the evening cutting and drilling alu sheets for the chassis, they will be spray painted tomorrow and left to dry over the weekend before I do anything with them. The paint I´m using dries in a couple of hours but takes a few days to fully harden.

revintage · 24th July 2008, 04:22 PM

Det där blir ingen lek! Jag kan "spajsa" upp steget åt dig om du vill.

Hoktuna sa att du också lirar. Har ni någon Myspace-sida så vi kan bli "friends"?

Ses snart!

Fuling · 24th July 2008, 04:58 PM

Det får du gärna göra! Jag har inte funderat så mycket över värdena på enskilda komponenter än, så den biten är öppen för förslag.

Spelar bas i två (radikalt olika) band:

http://www.myspace.com/crazybonessweden

http://www.myspace.com/outforretaliation

Synes!

revintage · 24th July 2008, 05:12 PM

Back at home next Tuesday. Just on my way to our summerhouse outside Arvika.

Check Myspace. You have two new requests.

Fuling · 24th July 2008, 05:18 PM

As long as you pick up the horns before 11/8

I don´t have the password to any of those Myspace pages, I´m just the bassplayer you know. I´m sure that the rockabilly guys will respond to your request, not so sure about the death metal guys though

revintage · 24th July 2008, 05:25 PM

OK, you can check my band at :

www.myspace.com/eflatjumptessandersson

It´s enough with the Rockabilly guys, I don´t care so much for the other stuff!

Will call you before coming!

Fuling · 24th July 2008, 05:48 PM

Good stuff!

Quote:

I don´t care so much for the other stuff!

I could have guessed...

hoktuna · 27th July 2008, 06:11 AM

Is the paint dry yet?

Maybe Lars got schematic an spajs it?

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25th March 2008, 08:49 PM	#22
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	John Broskie (tubecad) offers a solution for the symmetric feedback issue: http://www.tubecad.com/december2000/page14.html I like the idea of the "quick, short feedback loop" that "greatly reduces the output impedance and lowers the distortion of the amplifier". Making the feedback a local business for the output stage seems like a good idea to me.

23rd July 2008, 11:32 PM	#23
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	After a few months of salmon fishing and RC flying I´m getting back on the DIY audio track again. Instead of finishing some of my half-built projects I feel it´s time to start working on the circlotron. Due to the number of tubes and power supplies I will build it as mono blocks and to save a few hours I will "borrow" some chassis parts from an earlier OTL project that probably never will be finished. I will employ John Broskies output stage topology (see link in the previous post) with 1x 6N6P and 8x 6C19 per channel plus another 6N6P as an LTP input/phase splitter. http://www.mif.pg.gda.pl/homepages/f...13/6/6S19P.pdf http://www.tubes.ru/techinfo/HiFiAudio/6n6p.html I´ve spent the evening cutting and drilling alu sheets for the chassis, they will be spray painted tomorrow and left to dry over the weekend before I do anything with them. The paint I´m using dries in a couple of hours but takes a few days to fully harden.

24th July 2008, 04:22 PM	#24
revintage diyAudio Member Join Date: May 2007	Det där blir ingen lek! Jag kan "spajsa" upp steget åt dig om du vill. Hoktuna sa att du också lirar. Har ni någon Myspace-sida så vi kan bli "friends"? Ses snart!

24th July 2008, 04:58 PM	#25
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	Det får du gärna göra! Jag har inte funderat så mycket över värdena på enskilda komponenter än, så den biten är öppen för förslag. Spelar bas i två (radikalt olika) band: http://www.myspace.com/crazybonessweden http://www.myspace.com/outforretaliation Synes!

24th July 2008, 05:12 PM	#26
revintage diyAudio Member Join Date: May 2007	Back at home next Tuesday. Just on my way to our summerhouse outside Arvika. Check Myspace. You have two new requests.

24th July 2008, 05:18 PM	#27
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	As long as you pick up the horns before 11/8 I don´t have the password to any of those Myspace pages, I´m just the bassplayer you know. I´m sure that the rockabilly guys will respond to your request, not so sure about the death metal guys though

24th July 2008, 05:25 PM	#28
revintage diyAudio Member Join Date: May 2007	OK, you can check my band at : www.myspace.com/eflatjumptessandersson It´s enough with the Rockabilly guys, I don´t care so much for the other stuff! Will call you before coming!

27th July 2008, 06:11 AM	#30
hoktuna diyAudio Member Join Date: Sep 2004 Location: Eskilstuna	Is the paint dry yet? Maybe Lars got schematic an spajs it?