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In Reply to: Here and There and Back Again posted by tubesforever on August 6, 2005 at 11:57:25:
I have a calculator and know how to use it!!
Follow Ups:
because the two resistors are also in parallel with the 47000 ohms input of the preamp. But for all practical purposes any value 1000 or under will result in that value more or less when paralleled with 47000. For instance 1k is actually 979ohms. That's about the tolerance of the resistor.
My post show the label values, each resistor at 1%.The 47k resistor goes positive leg to ground, the cartridge loading goes from this leg to ground to the phono circuit.
So do you consider the cartridge loading as a fine tune of the 47k phono circuit?
We already discussed the fact that my brain scan confirms I have a zero ohm or dead open circuit! But my stereo sure kicks ass! Brain dead or not, I have a smile from ear to ear!
LOL
"So do you consider the cartridge loading as a fine tune of the 47k phono circuit?"Well, as I said before the circuit being changed is a combination of resistance, capacitance and inductance. These three elements in whatever combination occurs in your preamp (and practically no one knows that that actually is) create a filter. Changing the resistance changes the filter. It also changes the impedance which affects the frequency response of the cartridge.
So consider it what you will. Since the actual value of the resistance is somewhat arbitrary, there is no "correct" value for a given cartridge, the use of a 1% resistor only helps assure channel to channel sameness without actually measuring the two resistors first. I use standard 5% film resistors and actually they are more like 1-2% when a small grup are measured. But it doesn't matter unless you intend to create a given know impedance value and want to be dead on but that is different from empirical listening tests.
Sorry, my mistake three not two resistors. The calculator was not at fault, just me!Answer is 301.2048 ohms. No?
It seems to me that any proper calculator should be accurate to five significant figures. Here's the answer that my calculator provides.R = 1/(1/47000 + 1/860 + 1/450) = 293.574575917
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