Mid Scoop suggestions ?

[jfetter]

Any suggestions on scoop placement?

Output of first stage is low-z and can drive tone stack/ scoop etc.

Output-z of tone stack varies so maybe bad for mid scoop.

Also maybe if mid scoop in front of tone stack , z-out into tone will be a problem.

Obviously don't want to add another stage.🙁

Gave up on simulation long ago when valves and fets/jfets are mixed. Don't go there.

The prototype up any running great, now laying out board with scoop. Proto is point to point , don't want to disturb it now.

Thanks
Bruce


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[gingertube]

Bruce,
As no one has responded to date I would offer my opinion (FWIW).
I would suggest that you have the mid scoop ahead of the tone circuit, so the first (left most) position.
If you have some spare cash might I recommend:
The Valve Wizard
It has several mid scoop circuits.
See also example 14) here (the framus mid control):
http://chasingtone.com/yourguitaramp/guide-to-single-knob-tone-controls/
For your application I would reduce the caps by X10 , that is, change the caps from 10nF down to 1nF and increase the resistors by x10, that is 100K fixed resistor and 1M pot. That minimises loading on the driving stage. but the centre frequency stays the same.
Cheers,
Ian

 

[jfetter]

thanks for input. that is a great piece of advise on the RC scaling.

Just took delivery on Merlin's book you linked , and the new hi-fi book. Required reading for sure.

Made several changes to the schematic including removal of tone and scoop replacing with external connects so any stack can be used.

cheers