Ceriatone Chupacabra/Yeti/Son Of Yeti bright-switches

[Thunkful]

How do these switches work exactly? What i know from the manual and clips that it boosts highs and upper-mids and adds gain, but i'm talking about circuit-wise. What happens inside the amp when they are used and how these switches are done?

 

[technomancer]

This is a simple explanation... the switch just changes the value of the cap, though without pulling up the layout I can't give you exact values

https://robrobinette.com/Voicing_an_Amp.htm#Bright_Caps

 

[FourT6and2]

Yes, just a simple "bright cap" across the gain pot. Three position switch. On one side you have the typical stock Marshall value capacitor for a treble boost. On the other side you have a higher value, like 4700pF for example in the Chupa, which boosts more of the upper mids. You can use whatever value cap you want.

 

[scottosan]

It's important to note that the higher you turn up the associated gain pot, the less effect they have. With the pot on 10, they are out of circuit. I always tell people that of they thing the amp is too dark, turn down the gain

 

[Thunkful]

It's important to note that the higher you turn up the associated gain pot, the less effect they have. With the pot on 10, they are out of circuit. I always tell people that of they thing the amp is too dark, turn down the gain

How much effect would they have if the pot is between 6 and 8?

And another thing that i wonder is that how the bright switches actually boost gain when they are switched to left?

 

[FourT6and2]

It's important to note that the higher you turn up the associated gain pot, the less effect they have. With the pot on 10, they are out of circuit. I always tell people that of they thing the amp is too dark, turn down the gain

How much effect would they have if the pot is between 6 and 8?

And another thing that i wonder is that how the bright switches actually boost gain when they are switched to left?

It's all in that link. https://robrobinette.com/Voicing_an_Amp.htm#Bright_Caps

 

[Thunkful]

It's important to note that the higher you turn up the associated gain pot, the less effect they have. With the pot on 10, they are out of circuit. I always tell people that of they thing the amp is too dark, turn down the gain

How much effect would they have if the pot is between 6 and 8?

And another thing that i wonder is that how the bright switches actually boost gain when they are switched to left?

It's all in that link. https://robrobinette.com/Voicing_an_Amp.htm#Bright_Caps

No it ain't.

 

[FourT6and2]

It's important to note that the higher you turn up the associated gain pot, the less effect they have. With the pot on 10, they are out of circuit. I always tell people that of they thing the amp is too dark, turn down the gain

How much effect would they have if the pot is between 6 and 8?

And another thing that i wonder is that how the bright switches actually boost gain when they are switched to left?

It's all in that link. https://robrobinette.com/Voicing_an_Amp.htm#Bright_Caps

No it ain't.

Yes. Yes it is. Including a link to the bright boost calculator on the Amp Books page, which you can play with: https://www.ampbooks.com/mobile/amplifi ... ght-boost/

And there are many more resources on both of those pages. Go read through it all. Bass frequencies get attenuated. The capacitor allows high frequencies to pass through. The value of the capacitor changes the cut-off frequency. You hear this as increased gain in whatever frequencies the cap allows through.

The amps you're talking about have a different capacitor value on each side of the switch. To the left = 4700pF in the Chupa. That allows more mid-range frequencies to pass through. To the right = a lower value cap that only affects higher frequencies. In the Yeti, it's half the value for less of a mid boost.

All of this information is in that link.

 

[Thunkful]

It's important to note that the higher you turn up the associated gain pot, the less effect they have. With the pot on 10, they are out of circuit. I always tell people that of they thing the amp is too dark, turn down the gain

How much effect would they have if the pot is between 6 and 8?

And another thing that i wonder is that how the bright switches actually boost gain when they are switched to left?

It's all in that link. https://robrobinette.com/Voicing_an_Amp.htm#Bright_Caps

No it ain't.

Yes. Yes it is. Including a link to the bright boost calculator on the Amp Books page, which you can play with: https://www.ampbooks.com/mobile/amplifi ... ght-boost/

And there are many more resources on both of those pages. Go read through it all. Bass frequencies get attenuated. The capacitor allows high frequencies to pass through. The value of the capacitor changes the cut-off frequency. You hear this as increased gain in whatever frequencies the cap allows through.

The amps you're talking about have a different capacitor value on each side of the switch. To the left = 4700pF in the Chupa. That allows more mid-range frequencies to pass through. To the right = a lower value cap that only affects higher frequencies. In the Yeti, it's half the value for less of a mid boost.

All of this information is in that link.

That one i saw there, you're right. But i was talking about the gain. How the bright switch increases the gain in the left position?

 

[scottosan]

It's important to note that the higher you turn up the associated gain pot, the less effect they have. With the pot on 10, they are out of circuit. I always tell people that of they thing the amp is too dark, turn down the gain

How much effect would they have if the pot is between 6 and 8?

And another thing that i wonder is that how the bright switches actually boost gain when they are switched to left?

It's all in that link. https://robrobinette.com/Voicing_an_Amp.htm#Bright_Caps

No it ain't.

Yes. Yes it is. Including a link to the bright boost calculator on the Amp Books page, which you can play with: https://www.ampbooks.com/mobile/amplifi ... ght-boost/

And there are many more resources on both of those pages. Go read through it all. Bass frequencies get attenuated. The capacitor allows high frequencies to pass through. The value of the capacitor changes the cut-off frequency. You hear this as increased gain in whatever frequencies the cap allows through.

The amps you're talking about have a different capacitor value on each side of the switch. To the left = 4700pF in the Chupa. That allows more mid-range frequencies to pass through. To the right = a lower value cap that only affects higher frequencies. In the Yeti, it's half the value for less of a mid boost.

All of this information is in that link.

That one i saw there, you're right. But i was talking about the gain. How the bright switch increases the gain in the left position?

Think of it this way. A potentiometer is simply a variable resistor, so if you have a signal being attenuated at 100k resistance and you bypass it with a capacitor then the capacitor is passing the certain higher frequencies of the signal at less resistance than the resistor, so a portion of the signal goes through the resistor and a portion goes through the capacitor, causing a variation in the peaking frequency so simply by putting a capacitor there, you are bypassing specific frequencies with hotter signal than what the resistor alone would be passing it.