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Old 8th July 2006, 12:02 AM   #1
Ryssen is offline Ryssen  Sweden
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Default OTL with 6S19P?

I have 10pcs of 6S19P thought about a future OTL project,either for 8 ohm´s speakers or headphones.Anyone have any suggestions,the Pmax is 11w.
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Old 8th July 2006, 09:31 AM   #2
liberty is offline liberty  Italy
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Hi,
we are discussing about OTL SE here:
OTL SE

with your tubes you can do something similar.

You can also see:
http://hem.spray.se/sound.brigade/images/head-otl-1.jpg

6C19P = 6S19P (I think).

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Old 8th July 2006, 10:27 AM   #3
Ryssen is offline Ryssen  Sweden
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Quote:
6C19P = 6S19P (I think)
Yes the are the same.
Quote:
we are discussing about OTL SE here:
I will follow thet tread Just not sure wither i can substitute 6S19P into that construktion whitout recalculating the whole thing.
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Old 8th July 2006, 11:55 AM   #4
liberty is offline liberty  Italy
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I imagine 6C19P and 6080 are quite different tubes. So you need a datasheet with curves to recalculate the values.
I saw it's not so easy to find curves in the web for 6C19P.

I think(but I am not so expert) you can trying empirically, using the schematic like it is, putting 5 tubes per channel, and changing only the cathode res(under the 5 tubes).
Start with high value of cathode res(500 ohm - 20W). Then measure the voltage across this resistor. Using ohm law you can easy find the current flowing for each tube. I=V/R*5
Then decrease the value of this cathode res gradually, until you don't have about 90mA for each tube(450mA tot.)
This is the value of max current admitted for your tube(I found this value in the web).
Remember that this res dissipate a lot of power. So you need big power type(For my schematic I used 5 x 20 Ohm - 20W in series to reach 80 Ohm - 80W)


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Old 8th July 2006, 12:30 PM   #5
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Quote:
Originally posted by liberty
I imagine 6C19P and 6080 are quite different tubes. So you need a datasheet with curves to recalculate the values.

That's right:-)

I saw it's not so easy to find curves in the web for 6C19P.

No: http://frank.pocnet.net/sheets/113/6/6S19P.pdf
size of EL84, 7w P diss.



I think(but I am not so expert) you can trying empirically, using the schematic like it is, putting 5 tubes per channel, and changing only the cathode res(under the 5 tubes).


Since you have the specs, you can recalculate it. Empirically won't work, unless you make a huge amount of trials

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Old 8th July 2006, 02:42 PM   #6
Ryssen is offline Ryssen  Sweden
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11w if the volt is under 200. Any one know what output would be if I use 4 of them per chanel
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Old 8th July 2006, 03:44 PM   #7
liberty is offline liberty  Italy
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Quote:
Originally posted by Ryssen
11w if the volt is under 200. Any one know what output would be if I use 4 of them per chanel

It depends on type of configuration.
I imagine less than a couple of watts in single ended.

And about 20-30 Watts in pushpulls like these:

Click the image to open in full size.

http://www.tubetvr.com/otl.html

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Old 8th July 2006, 05:24 PM   #8
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Hi,

Not trying to sound negative but 6C19 is not an optimum valve for use in OTL's. The anode resistance is high and the transconductance is rather low so the output impedance even as cathode follower is high.

Typical data is Rp 400 ohm and Gm 7.5mA/V which gives a mu of ~3 and an output impedance as cathode follower of ~400/(1+3) = 100ohm, so you would need a lot of them in parallell.

There is another small russian valve that is much better, 6C41 which is similiar to a half 6C33C, that would be my choice if I wanted to build a small OTL.

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Old 8th July 2006, 08:20 PM   #9
Ryssen is offline Ryssen  Sweden
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Quote:
There is another small russian valve that is much better, 6C41 which is similiar to a half 6C33C
I have seen it on the web,I will read the article on OTL.
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Old 9th July 2006, 07:34 PM   #10
Ryssen is offline Ryssen  Sweden
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Quote:
There is another small russian valve that is much better, 6C41 which is similiar to a half 6C33C, that would be my choice if I wanted to build a small OTL.
You are right,I will look at 6c41 instead.Maybee i can use a6C33c schema,(frontend) for them. They are half the power of 6C33c so the output might be half of it.Perfekt!
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