NFB is like a magical cleaner. It reduce distortions, improve impedance and expand bandwidth. Like any cleaner, no matter how magical it is, you don't want to put too much of that stuff on your fancy furniture. It might clean up all that tube magic too.
Thanks to all. This is my amplifier
Test with 6H9C, 6H12C, 6N3C-E YouTube
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Test with 6H9C, 6H12C, 6N3C-E YouTube
You can try a variable resistor
There are variable resistors with screw adjustments that can cover the resistance range you are looking at. For most PP amps , depending on the quality of the output transformer, you will seldom see the FB resistor of more than 33K ohm. If you are considering using a pot , don't use analog type, get a linear pot.
There are variable resistors with screw adjustments that can cover the resistance range you are looking at. For most PP amps , depending on the quality of the output transformer, you will seldom see the FB resistor of more than 33K ohm. If you are considering using a pot , don't use analog type, get a linear pot.
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