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Hi. I must use 26' interconnects in my particular situation. I have a set of homemade RG-59 based cables running from a SS Tempest preamp to Kraft 250 monoblocks. My question is, how much is capacitnace likely to be affecting high frequency rolloff? Thanks.
Follow Ups:
Can anybody explain why the assumption was made regarding copper coated steel conductors?
I can't see any mention of steel in the original post. Is RG59 historically a steel based cable.My confusion arises partially from the fact that the much lauded Belden 89359 is described on the Belden Site as an RG 59 cable, but it contains not a jot of steel. The remainder of my confusion arises from the fact that I can, on occasion, be a bit of a dumbf**k.
Ta
Cheerswelly
I went to a restaurant that serves "breakfast at any time". So I ordered French Toast during the Renaissance.
I did a Google search to find a listing for the RG-59 unit capacitance, to answer the roll-off question.The site I found gave construction details, and all the RG-59 types used copper-coated steel for the center conductor. Other types used tinned copper or bare copper.
You should be able to get the total capacitance in these cables from the mfrs specs. Too high a capacitance might be affecting the ability of your preamp to drive these ICs? (You should be able to get a 'recommended maximum' from Tempest ... some other coax cable may have lower capacitance?)Secondly, if the Zout of your SS Tempest preamp is a lot less than 1/10th of the Zin of your Kraft 250 monoblocks ... then you probably don't have a problem with capacitance-induced HF rolloff. :-)) If it is less than 1/10th, you certainly will. :-((
Just FYI, due to the layout of my listening room I run 35' ICs between my preamp and active XOs ... and, to my knowledge, do not experience any HF rolloff.
Regards,
It is usually RG-6 that is Cu coated steel.
Hi and thanks for the info, guys. For the record, this is a copper RG-59. I really have superb performance but the anal audiophile in me wonders just how much a long run might be subtracting. Probably nothing worth fussing about, but why would I be posting here if I wasn't a fussbudget!
Please excuse me may I ask you some more details about your Ics?
1) what brand/model RG59 have you used?
2) what brand/model RCA plugs ?
3) have you compared it to any commercial product ?
Thank you very much and kind regards,beppe
Hi, The Cables and connects are Tibutaries brand.A2UL Silver Series
• Coaxial Design with Silver-Plated OFC Stranded Signal Conductor
• Double Layered Braided Shielding
• Foam Polyethylene Dielectric
• Blue PVC Jacket w/ UL® CL2 Ratingwww.tributariescable.com
My system was in flux when I made comparisons. At one point I had 26' Purist Audio Proteous Rev. A interconnects and 26' Nordost Flatline speaker wire. When I replaced the Purist interconnects with the Tributaries I noticed a very slight rise in noise floor.
I later replaced the Nordosts with 1.5 meter Purist Proteous speaker cables. The noise disappeared and the bass and midrange got bigger. High frequencies seemed about the same (excellent) through the transition on my Meadowlark Hot Rod Herons.
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as the center conductor in an audio application?Specs for capacitance vary, but 21.5 pF per foot seems like a conservative estimate.
The corner frequency for a 26-foot cable driven by a source with 100 ohms output impedance is 2.8 MHz.
This scales inversely with source output impedance. Your SS preamp likely has less output impedance, so the corner is likely to be higher. You should not have HF rolloff problems.
I'd expect the steel wire to have much more influence on the sonic performance.
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