ctechdx

Help to build up a tube equalizer
« on: March 07, 2020, 07:26:49 PM »
Hello folks,

I want to build this tube equalizer and need some help to do it right. *Schematics attached

I´m trying to simulate a stereo version in multisim. The simulation runs without errors, but I cannot measure the equalizer properly. I´m not sure how to do this, but I suppose with an oscilloscope I can see an equalizer boost in 1k tone. But in practice, I get only one dB of gain change when I move the pot for 1k frequency eq. 

Please could someone help to understand what´s wrong? I´m studying a lot but still a newbie on this. I did check everything and don´t get what is wrong. Maybe I´m doing the measures wrong.

Here a pic of my project in multisim:

https://ibb.co/6Nnf4kt

*the image doesn´t show the entire simulation, it couldn´t fit the screen, but it´s all the same with only capacitor change. I´m trying to simulate a 6 bands stereo version of this eq.

Thanks!
« Last Edit: March 07, 2020, 07:36:55 PM by ctechdx »


echoplex

Re: Help to build up a tube equalizer
« Reply #1 on: March 10, 2020, 06:20:47 PM »
Sorry, I can't really help you but this EQ looks very interesting indeed.
May I asked which book this scan is from?
Would love to test it actually..

fazer

Re: Help to build up a tube equalizer
« Reply #2 on: March 10, 2020, 07:11:49 PM »
Glass audio was a magazine in the 90’s. About building and understanding tube circuits.   I have some of those mags still and there is a website where you can buy issues I believe.   

ctechdx

Re: Help to build up a tube equalizer
« Reply #3 on: March 10, 2020, 07:20:45 PM »
Sorry, I can't really help you but this EQ looks very interesting indeed.
May I asked which book this scan is from?
Would love to test it actually..

Actually I don´t know. A friend of other forum share this with me. Seems to be a quite interesting project, but I still cannot make it work in a simulator. I don´t have much experience, then I want to understand and make it work in the simulator first. Hope someone can help. I don´t know what I´m doing wrong.

Michael Tibes

Re: Help to build up a tube equalizer
« Reply #4 on: March 12, 2020, 05:13:56 AM »
Maybe if you post your simulator file someone could help?

Some people here renamed the file to .jpg, so that they could attach it to the post.

Michael


mjrippe

Re: Help to build up a tube equalizer
« Reply #5 on: April 03, 2020, 01:20:34 PM »
Four words: Blonder-Tongue Audio/Baton


 

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