> White noise is definitely worst-case, and with max allowed
> ALC it makes an ugly spectral plot.
That's not true at all!
Steady white noise is NOT a good test of dynamics of bias or
ALC systems. As a matter of fact, it is the poorest test
available for determining bandwidth problems related to poor
power supply dynamics, poor ALC dynamics, and other similar
problems.
ALC testing requires a three-tone or pulsed two-tone or
noise test at various pulse repetition rates. Amplifier IM
products related to typical screen or bias system dynamic
regulation shortfalls NEVER show in a steady white noise
test.
If I wanted to use a test that masks bad power supply
dynamics or ALC attack problems and make the system look
significantly better than it does on voice, it would be a
white noise test.
73 Tom
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