[John L Stewart]

Altho several successful vacuum tube amplifiers incorporating a bootstrapped driver have been built & marketed, there are some of us still concerned with the positive feedback used. Turns out, not much occurs.

But could it lead to instability?

There is a simple method to calculate the maximum this positive feedback would be before even picking up a soldering iron. Anyone know how?

Cheers, John

[Vance_Iam]

Originally Posted by John L Stewart

Altho several successful vacuum tube amplifiers incorporating a bootstrapped driver have been built & marketed, there are some of us still concerned with the positive feedback used. Turns out, not much occurs.

But could it lead to instability?

There is a simple method to calculate the maximum this positive feedback would be before even picking up a soldering iron. Anyone know how?

Cheers, John

Dear John, I couldn't get that what do you exactly means! would you like to simplify the problem for me...??