[Amps] Bandwidth tests

[Tom W8JI]

Tom said:
>>ALC testing requires a three-tone or pulsed two-tone or
> noise test at various pulse repetition rates. <
>
> How about two very closely spaced tones - 10 or 20Hz 
> apart? That should really exercise the ALC circuits - and 
> the PSU effective output impedance.

Too high to pump ALC and too high frequency to work the 
electrolytics. Too close to resolve IM products on most test 
gear.

It has to be something that is well below the lowest audio 
frequency and represents the pauses or gaps in speech, and 
it has to look at what that does to higher pitched tones 
that speech would have.

73 Tom