Can Silver Interconnects be bright in your gear

I agree with Schubert, good quality silver just reflects the inherent character of your system/components. All silver cables aren't the same, in fact there's a broad range amongst them IMO.My current silver cables are open,resolving and transparent. They happen to be the most natural sounding cables I've had so far. Beautiful warmth,tone, harmonic color and instrumental fullness/body.No edge,brightness or harshness. So it just depends on which cable and in what particular system.

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!