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Low noise high voltage mosfet or jfet
Low noise high voltage mosfet or jfet
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Old 21st March 2020, 05:42 AM   #11
sgrossklass is offline sgrossklass  Germany
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For therecord, we're talking about the amplifier from this thread.
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Old 21st March 2020, 01:52 PM   #12
Frederico Acardi is offline Frederico Acardi  Italy
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Thank you everyone.

Yes it's this preamp. I will replace the 1M potentiometer in this circuit by a 5K one if possible.

But I did not post it because I wanted to know the theory also. I did not want to only have the suggestion and basta. I was affraid you guys will probably say, you don't need a low noise part everything will work fine.

That is why, sorry.
Quote:
Originally Posted by PRR View Post
Do you have 300 Volt signals?
Having 350V when you need 30V is a minor problem. There are many ways to reduce DC voltage, and you can also design-in filtering.
How can I do this without adding too much noise (or lowering the first gainstage also)
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Old 22nd March 2020, 02:58 AM   #13
PRR is offline PRR  United States
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Quote:
Originally Posted by sgrossklass View Post
For therecord, we're talking about the amplifier from this thread.
Frederico-

If the Altec preamp is "noisy", you are using it wrong.

However, just because something is vintage does not mean it is good.
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Old 22nd March 2020, 02:42 PM   #14
davidsrsb is offline davidsrsb  Malaysia
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Low to high impedance step up transformers are something to be avoided. A good one with better than dire frequency response and low frequency distortion is very expensive

Solid state does a better job of matching low Z microphones than valves ever can
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