919 mc head-amp
- Thread starter ghamilton
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rabbit
Well-Known Member
Years ago when I used my AU-919 with a Fidelity Research FR1 - Mk2 MC cartridge I had problems with low volume because the input impedance of the MC head amp in the AU-919 is very low in the order of 10 ohms which is too low for most MC cartridges 
I remember doing a bit of a kludge to improve things by removing the 33 ohm resistors in the gate circuit in order to increase the input impedance which helped a bit. It's a bit of a kludge which relies on the cartridge to provide the DC return path for the circuit. You could probably replace it with a higher value resistor but the head amp is a bit limited in this way.
I remember doing a bit of a kludge to improve things by removing the 33 ohm resistors in the gate circuit in order to increase the input impedance which helped a bit. It's a bit of a kludge which relies on the cartridge to provide the DC return path for the circuit. You could probably replace it with a higher value resistor but the head amp is a bit limited in this way.
