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In Reply to: RE: Output impedance of a DAC to input impedance of Power amp?????? posted by Tre' on August 11, 2014 at 20:23:33
Of course you can find cables less than 100pf per foot, and I used this as a maximum, that is why I said < less than 100pf.
As for frequency response no tube poweramp's output transformer I know of, can attain 100khz without masses of feedback around it, and then they sound rubbish.
Cheers George
Follow Ups:
"As for frequency response no tube poweramp's output transformer I know of, can attain 100khz......"
OK, but is that a good reason/excuse to add more phase shift in the audio band when it could otherwise be prevented?
Have a listen to 2.5k driving 600pF then drop that to 150pF. I would bet you will hear the difference even through an output transformer that can't make 50kHz flat.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Hey Tre" I'm all for speed, my amps are -3db at 180khz. Why do you think I called my product Lightspeed Attenuator it goes from dc - ghz in speed.
The simple fact is all digital sources are limited to 20khz and DSD to 50khz. And vinyl is a joke trying to reproduce a 20khz sine let alone square wave.
When I give my specs for interconnects to be used with the Lightspeed Attenuator I say <100pf per foot and 1.5mt long, this with the Lightspeed's output impedance works out to be -3db at 141khz.
Cheers George
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