Thordarson Dual Tone Control - diyAudio
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Old 9th July 2012, 08:27 PM   #1
xpl1c1t is offline xpl1c1t  United States
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Join Date: Jan 2008
Default Thordarson Dual Tone Control

Click the image to open in full size.

I stumbled upon this tone control schema in an old Thordenson catalog.
It appears to alter the treble at the grid and bass at the plate, uniquely using a 22H ~2kohm choke for the bass.

Relevance;
I'm currently designing a EF86 preamp that feeds an interstage transformer for phase splitting into a push pull output stage. For this design, I want to use a cathode follower to maximise the voltage step-down i need from the interstage transformer - therefor I'd like to use a cathode follower.

Now, i'm in the dark regarding the use of this design with a cathode follower stage. Is it advisable to strap this tone control to the EF86, or should it be separated from the pre for the same reasons so many people use cathode followers, and in that case how would it be used? Any advice would be great.

Cheers!




PDF Description and schematic here:
http://www.google.com/url?sa=t&rct=j...hMoyBAtRPiu13A
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Old 10th July 2012, 08:11 AM   #2
xpl1c1t is offline xpl1c1t  United States
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Well lookie here, found an old Gibson circuit schematic which implements the control on its preamp stage.

http://www.el34world.com/charts/Sche...son/EH-195.pdf
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