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www.tubecad.com Copyright © 2001 GlassWare All Rights Reserved |
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<< March 2001 ^^ TUBE CAD JOURNAL ^^ Volume 3 Number 2 >> |
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12 |
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Pg. |
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SE Amp CAD |
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Successful design and analysis of a single-ended amplifier output stage requires an accurate model of the tube's plate curves. SE Amp CAD is a tube audio design program that has a library of 30 tubes and over 100 output transformers and SE Amp CAD knows how these tubes really curve in a singled-ended amplifier. Windows 3.1 / 95 / 98 / Me /NT |
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SE Amp CAD |
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For more information, please visit our Web site or write us at: GlassWare PO Box 2 Santa Cruz CA 95063 USA |
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Hybrid power supply noise canceling amplifier |
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For those for whom "hybrid" means nasty, a purer approach is to use only a capacitor to introduce the power supply noise to the 300B's cathode. The added capacitor at the grid circuit is there to bootstrap the noise to the grid. The resistor ratio should favor the top resistor so as not to tax the feedback mechanism. For example, if the original grid bias resistor was 300k, then the top resistor should be around 270k and the bottom resistor, 30k. A .5µF capacitor is sufficient to couple to the cathode at 120 Hz. |
