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10 band EQ all tubes
10 band EQ all tubes
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Old 14th February 2019, 06:21 AM   #1
kissabout2002 is offline kissabout2002  Italy
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Default 10 band EQ all tubes

Hi to everybody,

I have plan to build a 10 band EQ all tubes, here schematic of the idea, I need from someone more expert than me help and suggestion, thank you in advance...all the best
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Old 14th February 2019, 06:41 AM   #2
DAK808 is offline DAK808  United States
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Good luck on your project. Sorry, i can only give you moral support.
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Old 14th February 2019, 07:23 AM   #3
jazbo8 is offline jazbo8
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This topic has been discussed several times in the past, if you do a forum search, you should able to find them. The schematic that you showed appears to be copied from somewhere, but it’s basically the same as the one that is shown here (near the bottom of the page): Practical Tone Controls.
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Old 14th February 2019, 07:55 AM   #4
Wavebourn is offline Wavebourn  United States
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The major flaw: tubes with 1 mA idle current in series resonance filters would distort like crazy. I would use some opamps with JFET inputs instead.
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Old 14th February 2019, 09:28 AM   #5
jazbo8 is offline jazbo8
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Some people like to do things the hard way...
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Old 14th February 2019, 09:55 PM   #6
mashaffer is offline mashaffer  United States
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Kissabout, do you happen to have an .asc file that you could post up?
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Old 14th February 2019, 10:43 PM   #7
cerrem is offline cerrem  United States
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Maybe a noise analysis would be in order.... Possibly a Balanced input output amplifier may help...
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Old 14th February 2019, 11:18 PM   #8
demetrios is online now demetrios  Greece
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Smile TRY THIS BY RICKARD BERGLUND

Something like this , its ok.
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Old 15th February 2019, 03:03 AM   #9
kissabout2002 is offline kissabout2002  Italy
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Quote:
Originally Posted by jazbo8 View Post
Some people like to do things the hard way...
Hard work never killed a man

Quote:
Originally Posted by mashaffer View Post
Kissabout, do you happen to have an .asc file that you could post up?
Yes I have, I just change the pot value to 100k rather 10k and on the simulator looks like much better response, if you can add more better option much appreciate it.....all the best

Quote:
Originally Posted by cerrem View Post
Maybe a noise analysis would be in order.... Possibly a Balanced input output amplifier may help...
Thanks cerrem, that is what exactly I was thinking about, in fact I add to the original schematic of Practical Tone Control an output amplifier, but I do not know if is right how I did it, can you suggest something more specific?

Quote:
Originally Posted by Wavebourn View Post
The major flaw: tubes with 1 mA idle current in series resonance filters would distort like crazy. I would use some opamps with JFET inputs instead.
Thanks wavebourn, can you suggest a better tube? What about 6N2P-EV?..all the best

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Originally Posted by DAK808 View Post
Good luck on your project. Sorry, i can only give you moral support.
no prob I appreciate your moral support.....all the best

Quote:
Originally Posted by demetrios View Post
Something like this , its ok.
Thank you, is very similar to the Practical Tone Control schematic but with a 100k pot.....all the best
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File Type: asc EQ 10 channel.asc (16.3 KB, 29 views)
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Old 11th May 2020, 08:22 AM   #10
kissabout2002 is offline kissabout2002  Italy
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Unexpected arrival of shipping from US during lockdown of remaining parts necessary to finish this all tube graphics EQ by Rickard Berglund suggested here by DEMETRIOS then again extended quarantine until May 15 so perfect for give a finish to this project.

Big task has been find a way to avoid to much cable connections, so I made this kind of "guitar string" for connect the all 10 modules, this workout very well avoiding bundles of wires and unwanted oscillations.

I just tested musically and sound and work very very well, no oscillation whatsoever and even the little hum on the wooden board test is gone, max vol on amp and no noise at all.

I still need nice knobs and somehow some print for the front panel.

I will test now the EQ with generator, scope and Rew for see the real performance.....all the best
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