[Amps] Parasitics & Filament Sag

[Peter Chadwick]

Tom said:
>When the obviously false notion a bias change can have a 
waveform change so sharp it will "ring" a VHF circuit in the 
anode system of an HF amplifier is coupled with the fact 
that a spectrum analyzer could never capture a dampened 
waveform,<

Is this totally correct with some of the new generation of FFT based spectrum analysers, Tom?
Admittedly, it would seem to me that a better tool for this would be a sampling oscilloscope, such as the LeFroy, which will capture single cycles of 2.4GHz, and do FFTs, thus acting as a spectrum analyser (although without the resolution of the conventional spec an.).
The only difficulty is the price tag around $38k...................
Now if I'd gone into RF integrated circuit design and gone to California, rather than into applications and systems engineering, I could confidently expect to be  having to scrape by on about $200k a year and could afford one.......And even then, it's very doubtful if any VHF ringing would be seen.
73
Peter G3RZP