Warbling on horns, piano and vocals

I would think that if you could record a test record track, like the 1kHz or 3kHz ones, that might help.
Usually with an ADC (Analogue to Digital Converter.) or with the ADC built into a sound card or microphone input on a PC.

I suppose if it good with the previous/other arm, then I assume we are thinking that the platter speed is not the cause.

From memory the long arm is something 19gm effective mass, and the 9” was 13 or 14 grams. So I don’t think adding the Schroder brass spacer to increase the effective mass is going to be helping.

Does the arm have any visual oscillation ?

If that is not it, then I would have thought that any resonance would have presented as something different than a warble.

Have you reached out to Frank via email? He is pretty responsive.
And I would be interesting in knowing what is happening.

I'm thinking it could be that the turntable is on a wall shelf and it's vibrating because it's sitting on something that's not massive enough. I'll test it today sitting on the hearth.

I'm thinking it could be that the turntable is on a wall shelf and it's vibrating because it's sitting on something that's not massive enough. I'll test it today sitting on the hearth.

Only affecting one arm and not the other?

To understand if there is a low frequency resonance of the system:

• If we knew whether the cartridges were high, medium, or low compliance would help.
• And also the effective mass of the other arm, and whether the effective mass of the CB-L is correct at 19gm.

Some ‘reflected’ high frequency resonance in the arm:
I am unsure how one would get a low frequency warble, but some IMD of a high frequency resonance might be possible.

This is getting well beyond me, and hence the suggestion to reach out to Frank.

It can be turntable mechanics conditions issue - motor, idler or springs.