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Hoffman Amps Forum image Author Topic: Vox style cut control  (Read 3943 times)

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Offline navdave

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Vox style cut control
« on: April 07, 2011, 09:23:32 pm »
This is from the infamous Dime Bag Darrell amp made by Krank.
Wouldn't this put DC on the cut control?

Offline sluckey

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Re: Vox style cut control
« Reply #1 on: April 07, 2011, 09:44:28 pm »
Yes. But since no current can flow thru the pot, it's not a problem.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline navdave

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Re: Vox style cut control
« Reply #2 on: April 07, 2011, 11:11:19 pm »
Thanks Sluckey!
Wonder if there would be any tonal changes if it was placed after the coupling caps like in a Vox amp.

Yes. But since no current can flow thru the pot, it's not a problem.


Offline HotBluePlates

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Re: Vox style cut control
« Reply #3 on: April 08, 2011, 02:16:19 pm »
I'd doubt there would be any difference, since the 2 locations would be functionally the same.

Offline The_Gaz

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Re: Vox style cut control
« Reply #4 on: April 10, 2011, 09:08:09 pm »
Yeah, no idea why they put it before the coupling caps - their idea of 'innovation', i suppose. They have also infamously used a variable slope resistor with no cap before the tonestack, placing DC voltage on the control. I'm not sure how that passed safety regulations.

Offline bobmegantz

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Re: Vox style cut control
« Reply #5 on: April 11, 2011, 06:40:08 pm »
there is a limit to how much DC you can apply to the resistive element before it will conduct to some other metal part of the pot...

Offline The_Gaz

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Re: Vox style cut control
« Reply #6 on: April 12, 2011, 12:54:10 am »
Sure, but the idea is that under some sort of fault the DC would reach the pot's casing. That would be much more unlikely to happen with a blocking cap before the pot, unless of course that managed to fail too. That would be one very very unlucky guitarist.

 


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