They are not limited to the relatively clean sounds that were demanded in the fifties. Modern players have the advantage of an extremely wide “acceptable” tone range to experiment within. Cathode-biased output tube tone can be “round” if no bypass capacitor is used, or it can be “crisp” if a cap is used – sounding quite similar to a fixed-bias output stage. Some of these amps are low powered, and others have lower supply voltages than later models, but many use “cathode bias” for the output tubes instead of the more efficient “fixed bias” method. Vintage guitar amps often produce a tone that is described as “round” or “mellow,” and they can produce a desirable overdrive sound. ~The following is an excerpt from our book, The Ultimate Tone – Vol. Cathode-Bias/Fixed-Bias Switching in Tube Power Amps.RBX Raw Bias Auxiliary Supply – When Do You Need It?.Power Scaling for Tube Amplifiers – Q&A.Independent Reviews of The Ultimate Tone Book Series.Hammond Transformers for Tube Audio Amplifiers.
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