In the third installment of the Carr Video Series, Steve presses boldly forward into the murky haze of tube biasing. Armed with diagrams and can-do spirit, he attacks the difficult subject matter. He emerges 9:39 minutes later, battered but victorious, and ready to begin sparring with video #4.
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Comment by __bob__:
Thanks Steve, That was a very tasty class.
It’s easy to see that you love what you do.
Comment by Scott:
Great Steve,
Many times its easy to see what’s going on as far as the schematics and where the flow of energy is going, but how that translates into the real world or understanding how it effects your tone is a little harder to see. You did a good job bridging that gap. Keep it up. Let us know when your going to kick out a higher watt EL84 amp, I’m dying to get that Raleigh tone on stage!
Comment by Chris:
What does it mean for an amp’s bias to be “fixed, nonadjustable,” as I’ve seen my amp described.
Comment by Steve:
Hello Chris
Good question. It means there is a ‘Fixed’ negative voltage applied to the Grid of the tube to set the bias (idle point) and this voltage is set by a few internal resistors rather than a pot.
Some folks mod amps like this – adding a bias pot so you can more accurately set bias with different tube brands.
When a company does this arrangement they are guessing at the typical bias needed for the tube type – but tubes vary a lot — so this is not the most ideal situation.
Best
Steve