Neutralizing An Amplifier

[popilin]

My friend, non calentarum largum vivirum, says the proverb.

Maybe, if you post a full screen schematic, all of us could see your circuit, even those who don't have LTSpice.

 

[huggygood]

sorry for bumping old thread but with it,i have solved an old problem in one of my amplifier .
there was a 1.8 pF capacitor between gate and plate of a triode of my inverters, and these capacitors actually made 1800pF instead of 1.8pF
many many many thanks !!!

 

[Osvaldo de Banfield]

I dont't understand exactly how the cap is installed, but for normal neutralizing caps 1.8nF seems to to be too bigger, the initial 1.8pF sound more realistic.

 

[nigelwright7557]

I did try netralisation caps (grid to opposite anode) on a differential splitter using 12AX7.
I could'nt get it stable, always ended up with an oscillator. I think I was using a cap of around 10pF which was probably too big.

Cheers,
Ian

Its hard to get a 12ax7 stable at the best of times.
I have often resorted to 12au7's to fix instability.