One pair of speakers, two different speaker wire

I recently upgraded my speakers (same speaker line). Although I find them to be more refined, they have a tad less body. I decided to switch my speaker wire with a custom-made pair that’s been lying dormant for several years. It gave me the body I was looking for but a little less air and clarity on the top. I decided to use both pairs at the same time. Now I’m getting everything I was looking for, but I’m wondering if I’m doing any damage to my tube amplifier? Thanks for your response.
No surprise here on your experience 

Hmmmmm..... only total silence and no contra posts at all  ..... in fact crickets only, from the "speaker cables don't matter" / "nil effect so  just go cheap-as-you-can-go in speaker cables"  naysayers cohort.
Again, thanks for your responses. However, let me clarify: I'm using two different pairs of speaker cables going to the same single speaker post. I'm not biwiring and using one pair on one set of speaker post and the other pair on the other post. Both pairs of speaker cable are going to the same single speaker terminal. Thanks!