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Neutralizing An Amplifier
Neutralizing An Amplifier
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Old 5th April 2013, 12:37 AM   #61
popilin is offline popilin  Argentina
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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.
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Old 7th January 2019, 10:58 AM   #62
huggygood is offline huggygood  France
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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 !!!
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Old 17th January 2019, 02:08 PM   #63
Osvaldo de Banfield is online now Osvaldo de Banfield  Argentina
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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.
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Old 18th January 2019, 06:55 PM   #64
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by gingertube View Post
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.
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