So Weird- No Stylus Contact Woofer Pumping with Hana ML and Elac PPA-2

Ok I tried the compass- nothin’

Everyone is focused on magnetism. This phenomenon is not magnetic. Something else is causing the cartridge to output a very low frequency signal. The cartridge is a very sensitive vibration measuring device. To output a signal all you have to do is move the cantilever. An unloaded cantilever hanging in the breeze might be sensitive to air currents. Blow gently on the cantilever and watch the woofers. For some reason the spinning platter with either the record or mat loaded produces an air current that the plater alone does not. Loading the cartridge differently by going from single ended to balanced configuration could change the damping on the cartridge enough to bring this out?

@mitchellcp , I also run balanced but other than blowing on the cantilever, I can not replicate your situation. 

Not everyone is focused on magnetism. Have you read any of my posts? I’ve just grown weary of contradicting Holmz, who IS focused on magnetism. I let his last fantasy stand as is, because I did not want to appear to be picking on him.

Like I have said three or four times, my best guess is that the system is oscillating at a very low frequency when the preamplifier is hooked to the cartridge output in balanced mode. When the OP switched to single ended mode, the problem went away. The bit about the platter mat and LP is a red herring, as per my earlier definition. The fact that it seemed to make a difference can possibly be due to the fact that when you power down an oscillating electronic device (in this case, the preamplifier or the amplifier would be oscillating due to input from the TT), the oscillation of course ceases. When you then restart or power up the same electronic device, even with the same input and output loading, the isolation may or may not reappear. In order to remove the platter mat and LP, in this instance, the OP had to shut down power to the TT and then power it up again in order to demonstrate the "no platter mat, no LP" condition. So lets say the cartridge is picking up something from the TT motor that intermittently causes either the preamp or the amplifier to oscillate but only in balanced mode. The intermittent nature of an oscillation is what confounds the investigation of its cause, let alone trying to fix the problem. And beyond that, we really do not have enough data to speculate further. Maybe the OP will eventually come forward with some additional information, but I don’t blame him if he does not want to be bothered and is perfectly happy to operate in SE mode.

Magnetism, shmagnetism.

In the post above, the word "isolation" which appears in line 9 of the second paragraph, should be changed to "oscillation".  I thought I fixed that within the time limit for editing, but apparently not.

I wonder what would happen if you rub a dryer sheet over the rubber mat?