A general rule of thumb is that the load resistance is at 10 times or higher than the coil impedance.
My suggestion is buy a metal film resistor kit, starting with 82Ω, and try different values to find what works best for you.
moving coil loading
I'm getting back into my audiophile hobby and dusting off my vintage gear. I have a question on the preamp loading impedance my Fidelity Research MC-201 cartridge. The specs for the cartridge are:
Stylus: 0.3 x 2mil line-contact solid diamond stylus
Output voltage: 0.16mV
Coil impedance: 8 ohms
Load impedance: 10 ohms
My Acoustat Trans nova preamp allows me to install any resisters required for loading the MC circuit. Just not sure on what value resistors to use. Any guidance would be appreciated. If more information is needed let me know
Showing 4 responses by imhififan
That’s the problem! We don’t know how resistant the Acoustat Trans nova preamp MC phono section is to RFI. IMO, a load resistance of 10 times the coil impedance or higher will not severely load down the cartridge, and my advice to the OP is to try different values and find what works best for him. BTW, you can find the schematic of Acoustat Trans nova preamp HERE in page 8 and 9. Please correct me if I'm wrong.
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The preamp only supply 6 sets of loading resistors, that is the reason I recommend the metal film resistor kit, it contains 1280 pieces 64-value ±1% metal film resistors for $10. My suggestion is start with 82Ω or 100Ω, and try different values to find what sounds best to you.
https://www.amazon.com/Resistor-Assorted-Resistors-Assortment-Experiments
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