Thanks for your thoughts slaw and h-n-t-b, as always. The moving mass interacting with a soft suspension that I spoke of was that of the ET’s arm, which is considerably greater than that of the Trans-Fi. Brooks Berdan came up with that mod of his for the Oracle Delphi, of adding mass in a particular location of the tables floating sub-chassis, specifically to keep the suspension’s bounce perfectly vertical, even with the mass of the ET arm (an arm he really liked, and sold a lot of) moving across the LP.
By the way, I’ll be trying various isolators in place of the HW-19’s springs, but the table will be on a platform isolated from the top shelf of the equipment rack it sits on with, probably, Townshend Audio Seismic Pods. I have lots of sets of Ingress Engineering roller bearings, which do a great job of isolating in all planes but the vertical, where they instead couple. Can’t have that!
Slaw, I now see the method of your madness! LP’s can be had via Amazon for $13? I like to buy local in cause of warps, etc., but for the $10 difference I’ll take the chance! I bought my Beatles and Dylan mono LP boxsets mail order, ’cause they were SO cheap. Oregon doesn’t have State sales tax, but Amazon charges tax to Washington addresses. But the gas to drive into Portland from Vancouver is probably as much as the tax!