Aftermarket fuse to tame a bright system?

I experimented with three different brands of pure silver cables that I bought used for a couple hundred dollars each. At first, I was impressed, but eventually decided that the top end was detailed, but too bright.  Changing tubes in my preamp helped, but didn't solve the problem. 

I'm now using a Harmonic Technology RecTa oc between my amp and preamp and a DH Labs Air Matrix between my dac and preamp. I also use the DH Labs Air Matrix between my sacd player and preamp.  I'm happy now. 

@sls883 the Harmonic Technology RecTa interconnect seems to use Neotech OCC Copper bulk cable. Did you retain the same clarity, details and soundstage when you switched over to this? I’ve tried some copper interconnect in place and it does indeed cure the the brightness, but I loose all of the other benefits of silver and the sound is comparatively murky.

@gavin1977

Yes, the Harmonic Technology cable gives me all of the sound qualities that you mention with my current gear.  Linear Tube Audio MicroZOTL preamp, Coda amp, Innuos Zen Mk3 streamer, etc. 

It was recommended by a rep with the Cable Company. The first time I tried it with my previous preamp, I didn't care for it. I felt that I was missing some top end. On a whim, I got it out along with the DH Labs cable and tried it. I'm very happy with the results. 

Thanks - will check it out