House de Kris
Loud-n-Deep
In another thread, comments were made about 'better' digital interconnects being closer to the ideal 75ohm characteristic impedance and that some 'audiophile' cables are not necessarily all that close. I kinda offered to measure cables for people, then measured a video cable that came packed in with a VCR. It measured 50ohms and that got me real curious. So, at lunch today, I ran over to the local audio shop and picked up a couple "real" digital cables to see how close to idea they are.
The Tributaries SCA-D (1 meter) package states in bold letters right on the front "True 75ohm Tip-to-Tip performance" "Silver-plated signal conductor" "Teflon dielectric" & "triple shielded." My price was $125, I don't know if this is typical street price or not.
TDR picture is below. The cable has a max value of 66ohms and a min of 63ohms. I think it would be a stretch to honestly call this a 75ohm cable. At least it is relatively consistent through the length of the cable. The minimum appears to be due to physical variance in the construction of the cable. Also, skin effect appears to be minimum.
I'll leave it at that, since this thread is intended to only deal with the characteristic impedance of interconnects rather than sound.
The Tributaries SCA-D (1 meter) package states in bold letters right on the front "True 75ohm Tip-to-Tip performance" "Silver-plated signal conductor" "Teflon dielectric" & "triple shielded." My price was $125, I don't know if this is typical street price or not.
TDR picture is below. The cable has a max value of 66ohms and a min of 63ohms. I think it would be a stretch to honestly call this a 75ohm cable. At least it is relatively consistent through the length of the cable. The minimum appears to be due to physical variance in the construction of the cable. Also, skin effect appears to be minimum.
I'll leave it at that, since this thread is intended to only deal with the characteristic impedance of interconnects rather than sound.
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