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World-class sine wave generator for cheap?
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TheUnnamedNewbie:
I was thinking (air) inductors and capacitors. I am not aware how linear these are. I know that MLCC will be atrocious for this, but thought film or mica capacitors could offer very good performance?

I am not an expert in this field myself, but I do know that this is how at work we tested some amplifiers for a hobby project of one of my colleagues. Started with a simple signal generator, and then just had filter banks we could tune to eliminate the harmonic. I think we got -120 dBc or better with that method.
basinstreetdesign:

--- Quote from: trobbins on May 25, 2020, 07:29:30 am ---Do you reach any overload/damage level if the notch gets accidentally changed when you are at -70dB setting ?  I can see an overload indicator.

--- End quote ---

The overload indicator on the SA indicates that, any higher signal level will distort internally and render the display full of harmonics.  Now, the HP scope is damage-proof from high signal levels by limiting the signal if too large (clipping).  The overload indicator comes on just short of actual distortion-inducing internal clipping, though.  So I can increase the input sensitivity up to the point where that light JUST comes on (about 4 dB above the top line of the display) but internal distortion has not yet occurred.  So if the input signal were to be accidentally changed upwards in level by a bunch of dB while the scopes input sensitivity is set quite high, (-70 dBV) there will be no damage.
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