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Old 25th March 2008, 10:14 AM   #11
poynton is offline poynton  United Kingdom
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Default Re: Re: 6S19 Circlotron (OTL)

Quote:
Originally posted by Fuling

Is a tube or a solder joint goes south, would it mean the end for my speakers?


Quote:
Originally posted by Miles Prower


You should add a DC offset detection circuit regardless of whether you implement this with SS or HS. Without an OPT, speaker poofage is always a possibility.

Funny, this question is asked whenever OTL is mentioned but rarely with SS.

What is the commonest failure mode for tubes , open or short.?
How often does it happen?


Andy
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Old 25th March 2008, 11:10 AM   #12
316a is offline 316a  England
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How about a push pull cathode follower OTL ? You could get away with using the 115V primaries of a mains transformer as your load and hang the speaker directly off the cathodes , alternatively use a lower ratio toroid and wire as an autoformer . Circlotrons are on my 'to do' list , I need to get my head round the 'floating' topology first I've got as far as a choke loaded SE 6C33 OTL which is currently breadboarded , I'll be building 72 ohm line arrays for this at the end of the week

316a
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Old 25th March 2008, 12:15 PM   #13
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Tubelovers Anonymous did a good study of the different otl output
arangements. Acording to info there the output impedience of a
push pull cathode folower is high 2 Rp/1+u and both sides must
be operated in class A. Back in 1951 one was built with 8 6as7g
tubes per chanel this gave a whopping 6.32 W into 16 ohms!

The Tubelovers Anonymous web page is now gone. A google
brought up a cached version of the page though.
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Old 25th March 2008, 12:33 PM   #14
Fuling is offline Fuling  Sweden
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Quote:
choke loaded SE 6C33 OTL
The reason I bought all those 6C19s and the sockets was to build a big choke loaded SE OTL with 8-10 tubes in // per channel.
I already have one with 4xPL504 per channel that sounds great, but lacks power.

The idea of a circlotron just popped up when I found those four power transformers. I thought they would be suitable for a circlotron as they have dual chamber bobbins and thus low capacitances between the windings.

I like the symmetry of a circlotron output stage but designing a good driver stage which allows symmetrical feedback doesnt seem easy.
Building an inverted Futterman using the same tubes and power supplies would be easier, but I dont like the idea of having to compensate for the output stage asymmetry.
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Old 25th March 2008, 01:01 PM   #15
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I have TWO of Ralph Karsten's (Atma-Sphere) early prototype Circlotron amps!!! Both use 8 6AS7G tubes per channel.

These amps are inherently stable. But, if you should lose one supply rail, you suddenly have 65V at the speaker terminals. If you build one of these. i would highly suggest building a relay system for the HV rails that will disconnect BOTH rails should either the + or the - rail fail.

Ralph has stated that in 30 years of building these amps. he has only had that happen once or twice. and the first prototype of Ralph's i have is a true prototype and ugly as sin. at first look you say "im not putting power to THAT!" but it has been running for nearly 30 years non stop! so these are pretty good amps.


Zc

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Old 25th March 2008, 01:11 PM   #16
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Default circlotron OTL

I have been working on one of these too. I am planning to use 4 6336As. If anyone has any original schematics I would be interested in seeing them. I still haven't decided on my driver tubes...maybe parralled 12BH7s or 6CG7s. JC
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Old 25th March 2008, 01:33 PM   #17
316a is offline 316a  England
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Quote:
Originally posted by Fuling

The reason I bought all those 6C19s and the sockets was to build a big choke loaded SE OTL with 8-10 tubes in // per channel.
I already have one with 4xPL504 per channel that sounds great, but lacks power.
Low power into a low load is the reason why I'm building a line array with 12 x 6ohm drivers in series per side

316a
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Old 25th March 2008, 02:17 PM   #18
ulibub is offline ulibub  France
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Hi all,

To avoid data redundancy ;-) I just would like to remind you of an earlier thread covering questions about 6C33C circuit designs, where I also presented my circlotron amp - also with some practical experience during construction and operation, and - with a circuit diagram. In the meantime, this amp has run now for more than 3 years almost every day without any problems.

Here is the link: 6C33 design comments

The amp has one pair of the big 6C33CB-tubes per channel, I think these could be replaced easily by several (matched) 6S19 tubes in parallel. It is -not- a true OTL design, I use a toroidal output transformer with a 4:1 winding ratio.

It sounds wonderful, I've never heard such a powerful an well-defined bass with an Tube amplifier. Not an easy project, but worth the effort!

Uli
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Old 25th March 2008, 03:30 PM   #19
nafanja is offline nafanja  Ukraine
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Default About 6S19

Hello people - if You like 6S19 You can find Russian 6S41S which can change 3 *6S19P.

6S19is not have analog.
6N15 like straight analog 6AS7 is note can to change 6s19.

6S19 have a good linearity and can give good Alfa( it's Rout/Ra).
Three 6S19 can give 13 Alfa in 230V in Anode with Io=40ma*3=120ma in SE sweetching and 6W that is enough for work with 94db acoustic amps where 1 300B with 13 Alfa can give just 1.5W
If SRPP it's 5 W with 200V in anode

But I don't know what os transformer less with transformer...
It's joke?
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Old 25th March 2008, 03:30 PM   #20
nafanja is offline nafanja  Ukraine
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Default Hello

About schemes...

Schemes is have somes variants
1) SRPP
2)SEPP

You see in a picture- it's SRPP.
SEPP it's the same but higher tubes is regulated from defferencial (cascade)
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