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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 7th April 2011, 05:36 AM   #1
Green77 is offline Green77  Sweden
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Default Twin DN2540 in TubelabSE?

Hello.

Would consult with you about putting twin DN2540 in my TubelabSE.
Is there a noticeable improvement in sound to do so? Or is it
most measurement result which is better?

Could it look like this? And how do you present value of the resistor (180 ohms?)?
Used 250 ohms before but thought 200 ohms sounded better. Have not measured how much mA I run through the
tube Maybe is booming..

Click the image to open in full size.


Sincerely. Daniel
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Old 7th April 2011, 06:47 AM   #2
analog_sa is offline analog_sa  Europe
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Quote:
Originally Posted by Green77 View Post
Used 250 ohms before but thought 200 ohms sounded better. Have not measured how much mA I run through the
tube

Are you lazy or just stupid? Resistor in second drawing is not in the correct place anyway. How about using a multiturn trim-pot to set the current with some degree of precision like everyone else? If you have any doubts about the presense of such a device in your sound chain you can always replace it with a fixed resistor once you're happy with the operating point.

IME the cascoded CCS does indeed sound better.
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Old 7th April 2011, 07:50 AM   #3
ErikdeBest is online now ErikdeBest  Switzerland
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Scroll down the page and see how to properly cascode the DN2540s. The author (not me) omits the gate stoppers, I would just use the 1k you are already using. Good luck.
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Old 7th April 2011, 07:51 AM   #4
Green77 is offline Green77  Sweden
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Well, it was a bit lazy I will messure it tonight.
I can see now that i draw it wrong.. Is this better?

Click the image to open in full size.

Thanks. //Daniel
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