tone stack gain recovery stage (v1b) fdbck loop explanation

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Joost
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Re: tone stack gain recovery stage (v1b) fdbck loop explanation

Post by Joost »

Structo wrote:Yep, that is how I have mine switched.

The switch goes to point between the .047uf cap and 22M or 2x10M on the grid side of the network.
The other lug of the switch goes to ground.
Very cool. but this doesn't take out the feedback network when the switch is closed, so how does it affect the tone versus just leaving out the network?

Also, could you put that switch on the front panel all the way from V1? or does that give a lot of lead dress issues? Could be a cool voicing switch. What would be a good name for the switch on the front panel? 'feedback' would lead to other associations
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stelligan
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Re: tone stack gain recovery stage (v1b) fdbck loop explanation

Post by stelligan »

Thanks for the info on the switching Gil & Tom. I see a switch coming in my 100 watter..........
My favorite cleans by far were my Bassman iron HRM build.
markusw
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Re: tone stack gain recovery stage (v1b) fdbck loop explanation

Post by markusw »

Joost wrote:
Structo wrote:Yep, that is how I have mine switched.

The switch goes to point between the .047uf cap and 22M or 2x10M on the grid side of the network.
The other lug of the switch goes to ground.
Very cool. but this doesn't take out the feedback network when the switch is closed, so how does it affect the tone versus just leaving out the network?
The switch - when closed - does remove the feedback network by shunting the plate signal to ground thereby preventing it from getting fed back to the grid.
Joost
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Re: tone stack gain recovery stage (v1b) fdbck loop explanation

Post by Joost »

markusw wrote:
Joost wrote:
Structo wrote:Yep, that is how I have mine switched.

The switch goes to point between the .047uf cap and 22M or 2x10M on the grid side of the network.
The other lug of the switch goes to ground.
Very cool. but this doesn't take out the feedback network when the switch is closed, so how does it affect the tone versus just leaving out the network?
The switch - when closed - does remove the feedback network by shunting the plate signal to ground thereby preventing it from getting fed back to the grid.

Yes I understand but doesn't the 22M resistor to ground change the voltage at the grid, thus influencing sound?
markusw
Posts: 475
Joined: Tue Sep 26, 2006 5:10 pm
Location: Vienna/Austria

Re: tone stack gain recovery stage (v1b) fdbck loop explanation

Post by markusw »

Joost wrote:
markusw wrote:
Joost wrote: Very cool. but this doesn't take out the feedback network when the switch is closed, so how does it affect the tone versus just leaving out the network?
The switch - when closed - does remove the feedback network by shunting the plate signal to ground thereby preventing it from getting fed back to the grid.

Yes I understand but doesn't the 22M resistor to ground change the voltage at the grid, thus influencing sound?
The grid is connected to gnd via the 220k grid resistor and the 1M volume pot anyway. So the 22M shouldn't influence the grid voltage.
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hans-jörg
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Re: tone stack gain recovery stage (v1b) fdbck loop explanation

Post by hans-jörg »

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Hi,
I put this switch from Tom into my D+-Clone and want only say: it works great!

Hans-Jörg






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