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About a I/V tube ouput for a Nos TDA1541A dac
About a I/V tube ouput for a Nos TDA1541A dac
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Old 10th July 2009, 06:17 AM   #1
gaetan8888 is offline gaetan8888  Canada
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Join Date: Apr 2007
Default About a I/V tube ouput for a Nos TDA1541A dac

Hello

I have done a I/V tube ouput for a Nos TDA1541A dac, I use 12AX7 tube because I have many of this tube.

Any suggestions about my schematic ?

And I would need formulas or suggestions of L and C values, for the input 20khz low pass filter and also for C in the negative feedback 20khz low pass filter.

Is better a LC filter or a RC filter at the input ?

Thank you

Bye

Gaetan
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Old 10th July 2009, 08:21 AM   #2
gaetan8888 is offline gaetan8888  Canada
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Join Date: Apr 2007
Hello

My first version of the the input 20khz low pass filter was to high order and would have a very bad phase response. So I have done a second version with a 2nd order Bessel filter.

I have taken out the negative feedback 20khz low pass input filter.

Thank

Bye

Gaetan
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