Hi Hans and Jim
No to hijack the thread, but you may be interested in my newly addition of test gear show in the pdf file attached and the articles linked

Please do not start a discussion on this forum but only consider this as an input

Kind regards

Kurt

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I need an analyzer to do much of what the APx555? does but at a lower cost.
Yes, I already own several high-quality sound cards and some software.
Hi-fi audio (CD players, for example) does require some high BWs and freqs if you're dealing with clocks and oscillator crystals.