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Questions about tubes and gear that glows. FAQ

It boils down to the circuit having by far the biggest impact on sound

of a component compared to tube flavor. People want/need +/- 3 to 6db and more impact on the frequency response when they are unhappy with the sound. If one brand of tube is "too bright", another brand will not produce a meaningful / measurable difference in frequency response unless one of the tubes is broken. The issue is typically boils down to the frequency response and impedance by frequency of the loudspeakers.

Many guitar amps use the cap across the plate load to smooth out the harsh icepick frequencies they can produce. I have played with bypass caps on the plate load resistors and the impact is pretty subtle in the 250pf range when listening. A shelving resistor, as pointed out, is best.

The reality is that people want and need tone controls but are too scared to have them because the cool kids say they are terrible.


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