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Old 25th March 2008, 05:57 PM   #21
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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.

Click the image to open in full size.
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.
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Old 25th March 2008, 08:49 PM   #22
Fuling is offline Fuling  Sweden
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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.
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Old 23rd July 2008, 11:32 PM   #23
Fuling is offline Fuling  Sweden
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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.
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Old 24th July 2008, 04:22 PM   #24
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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!
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Old 24th July 2008, 04:58 PM   #25
Fuling is offline Fuling  Sweden
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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!
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Old 24th July 2008, 05:12 PM   #26
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Back at home next Tuesday. Just on my way to our summerhouse outside Arvika.

Check Myspace. You have two new requests.
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Old 24th July 2008, 05:18 PM   #27
Fuling is offline Fuling  Sweden
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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
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Old 24th July 2008, 05:25 PM   #28
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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!
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Old 24th July 2008, 05:48 PM   #29
Fuling is offline Fuling  Sweden
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Good stuff!

Quote:
I don´t care so much for the other stuff!
I could have guessed...
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Old 27th July 2008, 06:11 AM   #30
hoktuna is offline hoktuna  Sweden
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Is the paint dry yet?

Maybe Lars got schematic an spajs it?
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