Long Exposures can be a real challenge, especially when the shutters snap as hard as they do in my 30D.
This is one of my Radii monoblocks with winged SED EL-34's, Mullard 12au7's and Herbie's tube dampers.

Tv(Shutter Speed) - 10Sec.
Av(Aperture Value) - F3.5
Exposure Compensation - 0
ISO Speed - 400
Lens - EF28-135mm f/3.5-5.6 IS USM
Focal Length - 28.0 mm
Image size - 3504 x 2336 (cropped in PS)