Has anyone ever tried these cables with a VTA 70?
4 posters
Polk cobra cables
tubenutr- Posts : 78
Join date : 2015-01-25
Age : 67
Location : Northern Ontario
corndog71- Posts : 840
Join date : 2013-03-19
Location : It can get windy here
Never heard of those. I'm a fan of Kimber 4TC or 4VS if you want to save a few bucks.
deepee99- Posts : 2244
Join date : 2012-05-23
Location : Wallace, Idaho
I have had nothing but good luck with Blue Jeans cables. They are the only folks who use Belden wire, which is the best copper on the planet and their terminations are very good, cold-welded.
tubenutr- Posts : 78
Join date : 2015-01-25
Age : 67
Location : Northern Ontario
I've had a pair sitting around for about 25 yrs and was just wondering if they will cause any problems
with a VTA 70
with a VTA 70
deepee99- Posts : 2244
Join date : 2012-05-23
Location : Wallace, Idaho
Never heard of copper rotting, but I guess there's a first time for everything.
GP49- Posts : 792
Join date : 2009-04-30
Location : East of the sun and west of the moon
I wouldn't touch them. Polk had an idea that they could reduce the cable inductance by making the cable out of a multitude of individual insulated strands...half of them comprising one conductor, the other half, the other. They succeeded in reducing inductance but greatly increased capacitance, like hooking up a big capacitor across the output of the amplifier. This drives some amplifiers nuts. Some amplifiers oscillate under a capacitive load (stock Dynacos do not). Some transistor amplifiers would BLOW UP! Polk finally tried to compensate by adding a resistor/inductor network, which would defeat the whole purpose of the design to reduce inductance in the first place.
Even if a high capacitance load doesn't cause the amplifier to oscillate, it can roll off the high frequencies at the output, affecting the feedback loop's operation and altering the amplifier's sound.
If the enamel insulation cracked or was otherwise compromised, there was the chance of a dead short across the amplifier output terminal to ground. Not good under any circumstance.
Even if a high capacitance load doesn't cause the amplifier to oscillate, it can roll off the high frequencies at the output, affecting the feedback loop's operation and altering the amplifier's sound.
If the enamel insulation cracked or was otherwise compromised, there was the chance of a dead short across the amplifier output terminal to ground. Not good under any circumstance.