Jim Lesurf wrote:
In article .com,
max
graff wrote:

Hi Don,


I hear the low-frequency 'dhub' when I lift/lower the stylus when the
amp is connected.


Ah! That is quite different to your initial description which was about
"stop or start the turntable mechanics".

Such behaviour isn't uncommon and is caused by the stylus being moved as it
makes/breaks contact with the LP surface. It is 'harmless' provided you
lift or lower the arm with due care. i.e. slowly and vertically.

I don't remember suffering from that problem. Perhaps Max's phono
preamp design omits the RIAA 50.05Hz corner, and the IEC 20Hz one.
The thump when switching the preamp on or off is normal.

--
Eiron.