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Old 26th January 2013, 04:11 PM   #11
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If 5mA is flowing through one valve then the same will be flowing through the other.
You will have to calculate the anode and cathode resistor values to reach the 5mA.
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Old 26th January 2013, 04:15 PM   #12
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Thanks for all help.
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Old 26th January 2013, 04:25 PM   #13
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This may help in your calculations

http://www.mh-audio.nl/Downloads/Tub...s/Ei-ECC81.pdf

Regards
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Old 26th January 2013, 04:30 PM   #14
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Thanks again, you are very kind. Do you know a free and easy simulator to calculate the new resistor values?

Cheers
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Old 26th January 2013, 04:49 PM   #15
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Have you tried LTspice?
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Old 26th January 2013, 04:50 PM   #16
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It's easy and free?
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Old 26th January 2013, 04:51 PM   #17
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Free - yes. Quite easy.
A lot of tube models and knowledge across the Internet. A lot of people use it here also.
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Old 26th January 2013, 04:53 PM   #18
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Where can get it?
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Old 26th January 2013, 04:55 PM   #19
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Quote:
Originally Posted by merlin el mago View Post
Where can get it?
http://www.linear.com/designtools/software/
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Old 26th January 2013, 05:07 PM   #20
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Thank you, do you know if are installed the tubes in the LTspice library?
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