THANKS all for your insight thus far. Despite a secondary thread begining to develop here about tube replacements, I think the concensus to my posted question is to forget using a line conditioner with the FS preamp. On a related note, I was speaking with Bea from VTL today about the same two issues (power cord upgrade or to use a line condition on the VTL amp) and she suggested that tube rolling would provide more benefit than replacing the stock power cord. Specifically she suggested replacing the Svetlanna 6550 tubes with KT88 and thought that plugging the amp directly into the wall outlet would be best. Seems to be some consistent information across manufacturers.
Audiofankj -- thanks for the tip on locating the Siemens 7308 tubes @ Upscale Audio.
Tvad -- thanks for the heads up on the alternative tubes both 7308 and 6922's. I haven't heard of the "Joe's Tube Lore" article so thanks kindly for bringing it to my attention.
Happy listening all.
Audiofankj -- thanks for the tip on locating the Siemens 7308 tubes @ Upscale Audio.
Tvad -- thanks for the heads up on the alternative tubes both 7308 and 6922's. I haven't heard of the "Joe's Tube Lore" article so thanks kindly for bringing it to my attention.
Happy listening all.