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Old 9th October 2003, 09:51 AM   #1
vytas is offline vytas  Lithuania
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Default Looking for Very good tone control schem.

Hello for everyone!

Please help my to find audio tone control schematics. I looking for very good (High End) solutions. I think it shuold be pasive system and it shuold regulate +-5dB for high and low bands.

I expect you understan what I mean, (I am about my English)
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Old 11th October 2003, 12:11 PM   #2
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How about this: http://www.angelfire.com/electronic/.../Amp-Tone.html
Passive setup...


If active is a considration, search for "Baxendall tone control" on the web...
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Old 11th October 2003, 12:20 PM   #3
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Interesting. Found passive versions of the Baxandall filters...shows you what I know about filters....little...

http://headwize2.powerpill.org/proje...=equal_prj.htm
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Old 11th October 2003, 05:36 PM   #4
mlloyd1 is offline mlloyd1  United States
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I know you said "passive". However, I'd urge you to consider the active, "baxendall-like" tone control design featured in the Apt preamp from some years ago. I posted the relevant parts of the schematic some time ago (a search should find it here and a patent search should find it elsewhere - it was patented. I'd post it again but my stuff is all packed up). A key point was that it added a unity gain buffer to minimize interaction in mid band. The buffer also made the math easier - when I was younger, I liked deriving the equations for all kinds of filters and comparing the results to various simulators we used to play with. I liked the Apt preamp for it's day and I built versions of the tone control for some of my earlier preamps which are still serving friends well.

Of course, now I don't use tone controls at all, but that's another story for another day.

mlloyd1
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Old 11th October 2003, 07:33 PM   #5
Cobra2 is offline Cobra2  Norway
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Default More about tone-controls

here: http://www.zero-distortion.com/views/glavna.htm

Arne K
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Old 12th October 2003, 06:55 PM   #6
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Quad preamp tone controls are different and useful.

Eric.
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Old 13th October 2003, 08:10 AM   #7
vytas is offline vytas  Lithuania
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Default Monday morning...

Good morning,
Thank you very much, for replay, I found some interesting things in EchWars sugestions, I shall try to implement some ideas. I understand Mlloyd1’s idea, at this moment I use two amps without tone control, and I bild one more High quality amp, in this one I wish to instal t.c. I worked about ˝ year with Baxendall solution, read many articles, tried active t.c. used “tonestack” soft for calculations, used different loads…. And spend many $…
One more question: I had never tried Quad amps and preamps, are they good or just medium quality?

Thank you for replay... and greetings from Lithuania
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Old 13th October 2003, 05:39 PM   #8
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Default QUAD Preamps

I think you will chatagorise the QUAD preamps as "medium" quality, however I'm very please with my modified 34 preamp.

And I very fond of QUAD's "Tilt-circuit" for tone control (that is if you want or need tone controls at all.......)
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Old 14th October 2003, 06:42 PM   #9
dimitri is offline dimitri  United States
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May I recommand you Williamson Audio preamp, EW+WW, Dec., 1993, pp.1012-1013
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Old 14th October 2003, 09:43 PM   #10
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It will amuse you to consider that Tom Holman got
his chops patenting a tone control circuit, which I
can recommend.
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