Contour knob

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Contour knob

Postby noworrybeefcurry » Thu Sep 09, 2010 7:33 pm

I am still in the process of planning my build and i wanted to to include a two rock style contour knob. But i am not sure how the actual knob works; is it a NFB control? or is it a separate part of the tone stack? any help would be appreciated!
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Re: Contour knob

Postby jerrydyer » Mon Sep 13, 2010 12:33 pm

for a contour or mid shift use a 100k pot with a 10k or 15 k res in front of it. from that cathode go one wire to your treble pot and one wire to this new control.. the out of the slope pot now goes to the two tone caps.
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Re: Contour knob

Postby Tone Junkie » Tue Sep 14, 2010 11:12 am

Could you explain again I still dont quite get it what two tone caps. Thanks Bill
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Re: Contour knob

Postby jerrydyer » Tue Sep 14, 2010 12:51 pm

well, your breaking the connection between the slope res, usually the 33k or 56k and the two tone caps, usually .022. Your just adding a 15k res and a 100k audio pot between there now. slope control, contour like control. A true mid contour you would have to go Baxandall type tone network instead.
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Re: Contour knob

Postby noworrybeefcurry » Wed Sep 15, 2010 2:09 am

Im sorry, im still not following. Is their a schematic or layout you could show us?
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Re: Contour knob

Postby tonemerc » Thu Sep 16, 2010 6:17 am

noworrybeefcurry wrote:I am still in the process of planning my build and i wanted to to include a two rock style contour knob.


It's not in the tonestack, but at the opposite end of the amp. Look at any Vox AC30 top boost "cut" filter thats located in it's PI section.

TM
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Re: Contour knob

Postby jerrydyer » Thu Sep 16, 2010 6:16 pm

he also said something about tone stack control so i gave him my slope control. works great

need a cut control look a t a vox schem.
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dup n/m

Postby tonemerc » Thu Sep 16, 2010 8:28 pm

dup
Last edited by tonemerc on Thu Sep 16, 2010 9:05 pm, edited 1 time in total.
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Re: Contour knob

Postby tonemerc » Thu Sep 16, 2010 9:04 pm

What I pointed him to is the TR Contour control. Looking at the front view the "Contour" control is the rightmost pot, while looking at the guts pic it's to the far left. The TR contour is a 250K pot that ties via the red wire to a .005( small blue pill) poly cap that connects the right PI grid coupler.

TM
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Re: Contour knob

Postby mensur » Sat Sep 18, 2010 3:25 am

jerrydyer wrote:well, your breaking the connection between the slope res, usually the 33k or 56k and the two tone caps, usually .022. Your just adding a 15k res and a 100k audio pot between there now. slope control, contour like control. A true mid contour you would have to go Baxandall type tone network instead.

It's something like this:
http://img201.imageshack.us/img201/5929/contour.png
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Re: Contour knob

Postby noworrybeefcurry » Sat Sep 18, 2010 7:31 pm

You guys are the best! Thank you!
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Re: Contour knob

Postby noworrybeefcurry » Sat Sep 18, 2010 9:24 pm

tonemerc wrote:What I pointed him to is the TR Contour control. Looking at the front view the "Contour" control is the rightmost pot, while looking at the guts pic it's to the far left. The TR contour is a 250K pot that ties via the red wire to a .005( small blue pill) poly cap that connects the right PI grid coupler.

TM


so basically the contour control is acting like a high cut filter?
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