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Old 24th January 2006, 11:16 AM   #1
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Default Se 1.5w Otl

I wonder is there anyone in the forum has scratch the SE1.5WOTL
of Transcendentsound?
I really want to build one.
Schematic wanted!

CHOW
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Old 24th January 2006, 11:31 AM   #2
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Hallo Chow,

I would also be interested to build something like that as I have 8 of those 6c19pi tubes lying about idly.

Should not be too hard. I suppose it would just be 4 * 6c19pi in parallel..configured as a cathode follower, with a big fat output cap. Just add a driver stage (6H30pi) and voila.

The only "tricky bit" is to ensure the same amount of current is flowing through each tube...but you can always do that later...

I'll try to come up with something one of these days.



Regards,
Bas
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Old 24th January 2006, 11:55 AM   #3
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Actually preventing damage to the loudspeaker during startup and switching off will be my biggest challenge....
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Old 24th January 2006, 02:19 PM   #4
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Not so simple,

4 * 6C19 in parallel as cathode follwer and a cap?

Where is the current coming from? Resistor? Inductor?

Reinhard
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Old 24th January 2006, 02:59 PM   #5
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Quote:
Where is the current coming from? Resistor? Inductor?
Not sure..isn't the current set by the cathode resistors?

Would a cathode follower not be the way to do it?
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Old 24th January 2006, 03:01 PM   #6
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Think you don`t get 1,5 Watt from a resistor.

Reinhard
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Old 24th January 2006, 03:05 PM   #7
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Quote:
Think you don`t get 1,5 Watt from a resistor.
That shows you how little I know

Ok...I give up..how is it done
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Old 24th January 2006, 03:07 PM   #8
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Default SE OTL

Hi Bas.

output stage is working on an 320 mH 600 mA Inductor as cathode follower, each tube has an additional 5 Ohm resistor for better current sharing.

Have the schematic, but donīt ask, think it is intelectuell property of Bruce Rozenblit.

Reinhard
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Old 24th January 2006, 03:10 PM   #9
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That shows you how little I know

donībe shy, Bas
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Old 24th January 2006, 03:28 PM   #10
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Quote:
Have the schematic, but donīt ask, think it is intelectuell property of Bruce Rozenblit.
Hi Reinhard...I won't ask.

The info you gave me should be enough for me to rig something up that will work.
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