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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Hi Jim---regarding 'Headroom'... posted by Kico on March 20, 2006 at 10:45:59:
Thanks Kim.There is one variable that can affect the "breakup" point, and that is the bias voltage. While the bias current was the same, the bias voltage it took to achieve that remains a variable.
For example, if it only took -40 for tube "A" to be biased at 85 ma. then a positive going signal larger than 40 volts will drive the tube into grid current. A tube "B" that biased at -45 would have more "headroom" before that would occur. A tube "C" biased at -50 would have the most room before it went into passing grid current - but it would also be closer to cutoff if the negative swing was large. A 50 volt negative signal added to the -50 bias puts the grid at -100.
Just something to chew on...
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Follow Ups
- Re: Hi Jim---regarding 'Headroom'... - Jim McShane 12:48:02 03/20/06 (1)
- Yep, you always give us something to chew on :-) (nt) - Kico 13:32:35 03/20/06 (0)
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