Schade P2P and gNFB in RH807

[jhstewart9]

Dual SE Cancels D%

Have a read of this.

 

[jderimig]

Or, stop worrying about it.

I will go with that option.

 

[jderimig]

Have a read of this.

TY

 

[Bandersnatch]

Have a read of this.

Holy smoaks...'the dual single ended amp is subject to patent protection'...what an effin crock. Not that a PP Class A amp is not better...
cheers,
Douglas

 

[kuroguy]

I tried to make a logo with a vacuum tube playing a guitar using a coke bottle shaped tube like an 80 tube. All of my wife's friends said it looked like an uncircumcised penis. They're saying the tube in this ad looks like it's wearing a rubber. they're also saying practicing safe sex is a sound practice.

 

[jderimig]

I added a toggle to switch gNFB on and off. I assume its ok to hot switch this?

 

[zintolo]

It will pop a bit, because you remove that 2k2 to ground in parallel with 300 Ohm cathode resistor, so the working point will change a bit.

Another option is to have a 1 kOhm resistor in series with a 10 kOhm Log potentiometer: around noon you'll have the same feedback, then you can increase it or decrease it to taste. It will scratch, because there's DC across it, but you could like the added feature.

 

[jderimig]

Good idea. I also want to add a switch to the Schade loop as well so I can repeat @jhstewart9 simulations. I have 2P2T switches so I can do 2 levels of FB on each option.

 

[Bandersnatch]

Switching the Schade loop out will change the OP of the stage ahead of it by the DC flowing through its resistor and is *NOT recommended to switch hot.
cheers,
Douglas