About a I/V tube ouput for a Nos TDA1541A dac

[gaetan8888]

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

 

[gaetan8888]

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