Explanation of Self-Biasing/Cathode Biasing

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Stan Malinowski
Junior tube assistant
Posts: 5
(2/23/04 7:46 am)
 Explanation of Self-Biasing/Cathode Biasing
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 Can anyone give me an explanation of how cathode biasing becomes self-biasing? I understand how cathode biasing works...the current running through the cathode resistor creates a voltage which is negative relative to the grid voltage.

What I don't understand is how tubes of different types with different currents can be self-biasing. It seems like the more current flowing through the tube the greater the negative bias voltage would become. I'm confused....

Thanks For Any Input!,
Stan
 
GroundhogKen
Forum Moderator
Posts: 2292
(2/23/04 11:39 am)
 Re: Explanation of Self-Biasing/Cathode Biasing
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 "Self-Biasing" is a misleading term.

Most of the amps that we discuss around here are:

Cathode Biased
Fixed Grid Bias
Adjustable Grid Bias.

Where "adjustable" implies that there is a pot that can be tweaked without unsoldering any resistors.

There are amps which have bias monitoring circuitry which would be more in line with the term "self-biasing".


Ken
 
ganzonimx
Hey get your own solder
Posts: 401
(2/23/04 12:00 pm)
 Re: Explanation of Self-Biasing/Cathode Biasing
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 I have a self biased amp, 'caus I bias it my SELF  
 
GroundhogKen
Forum Moderator
Posts: 2293
(2/23/04 1:13 pm)
 Re: Explanation of Self-Biasing/Cathode Biasing
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 Exactly! No confusion there.

Bravo.


Ken
 
 
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