Can Silver Interconnects be bright in your gear

Tubes got the reputation of being mellow from the Dynaco ST-70 days which rolled off highs and used the smooth EL-34 tubes.
I've heard and had a few 6550 amps that were quite bright.
I believe today if you want a good tube amp those is no road but the SET 300B route and the best 300B's available, which are NOT cheap, which is why I don't have one.

No,silver interconnect can not add brightness in your gear. Most silver cables on the other hand have had greater bass, mid and treble extension.
I replaced with all solid core silver cables to my system, the extension and image was amazing.

True, Beewax , many mistake extension for brightness.

I believe Jerrott has given you sound advice that closely aligns what my personal quest has revealed!

A properly designed cable with unplated pure silver wire is very resolving but not really brighter. I have listened to many silver cables over the years and the sonic result does vary. Typically SPC wire in heavy dielectrics can be rather screechy sounding.