Technics SP-10mk2 oscillations


A peculiar thing going on with my SP-10mk2. Without the platter, the rotor oscillates  at high frequency and amplitude while turning at 33rpm. At 78rpm, the oscillations are much less so. With the heavy platter on, oscillations disappear. No gridding noises, etc. Anyone experienced a similar issue or can share any helpful tips? Thanks in advance.

Ray

 

rays19

Showing 2 responses by lewm

Rays, you’re not the first guy to make this mistake, so don’t feel bad about it. I hope your SP10 was not damaged. Most likely it was not if you ran it only briefly sans platter.

What Best-groove said.  What you observed, rays, is normal and not a good idea in practice. The servo system needs the mass of the platter in order to operate properly.  The herky jerky motion of the rotor without any mass on it is what to expect.