Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => EZ Board postings => Topic started by: Geezer on June 17, 2005, 09:27:15 pm
-
Hoffman Amplifiers
> Tube Amp Building - Tweaks - Repairs
> Explanation of Self-Biasing/Cathode Biasing
<< Prev Topic | Next Topic >>
Author Comment
Stan Malinowski
Junior tube assistant
Posts: 5
(2/23/04 7:46 am)
Explanation of Self-Biasing/Cathode Biasing
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
"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
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
Exactly! No confusion there.
Bravo.
Ken
<< Prev Topic | Next Topic >>
Topic Commands
Click to receive email notification of replies
jump to: Tube Amp Building - Tweaks - Repairs (New)New Product Suggestions (New)Praises - Complaints - Suggestions (New)Buy - Sell- Trade (New)Archives (New)
- Hoffman Amplifiers - Tube Amp Building - Tweaks - Repairs - Hoffman Amplifiers -
Powered By ezboard® Ver. 7.32
Copyright ©1999-2005 ezboard, Inc.