[sdiy] tonal tilt

[John Mahoney]

At 06:13 AM 10/6/2007, JH. wrote:

> >Looking at it more closely, the headwize version might be more simplified
> >than the Quad circuit.
> >The Quad has two RC combinations in parallel - might be some staggered time
> >constants stuff to create a more widespread rolloff than the headwize
> >version.
>
>ETA: Yes, it's true. The Headwize circuit does *not* create the same slope
>as the Quad circuit.
...
>See how in the quad circuit  there are the 91k, 3n3 *and* 56k, 1n networks
>around the pot.

You are mixing R and C values, there, but yes, I see where the HW 
circuit is simplified.

The bass circuit does look interesting, too. My biggest surprise was 
seeing all those TL071s in the Quad! Of course, you couldn't get the 
nice Burr-Brown and Analog Devices op amps back then.

If you happen to decide to make a PCB, you can count me in. :-) The 
unique Quad tone controls made using better op amps? I'd build a few sets.
--
john


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