Intact Audio

my output is 0,3 mV and a 1:15 step-up seems right. But how about a 1:12 step-up so I would also be able to use a o,4 or 0,5 mV cartridge in the future.
Is it possible for this range to design a step-up in its sweet spot?

Erik

I had not thought of that. Measurement of the cartridge including the tonearm-wiring shows 2,4 ohm and 2,3 ohm on respectively the left and right channel. My interconnect ads another 0,1 ohm. My multimeter test-probe leads show a resistance of 0,3 ohm which should be subtracted. All in all a step-up...

Hi Dave, how about low impedance cartridges? I am using a MySonicLab Ultra Eminent with 0,3 mV output and 0,6 ohm impedance. Is it possible to design a step-up that puts this cartridge in its sweet-spot? A ratio of 1:15 seems about right, but how about a 1:12? I rather have a bit less gain and futur...

Hi dave, I noticed that my images were rather big. Here comes another try :-) I didn't change anything, other then the inductance of the LCR and the termination resistor on the secondary side of the step-up in order to create the matching load. The loss of base, on this level, is not an issue. I jus...

I also compared the 600, 1200 and 2200 ohm LCR in my circuit, al things else being equal: LCR-600: - gain: 40.2 dB - 30 Hz: 0.07 dB roll-of - 20 kHz: 0.084 dB roll-of - phase shift 14 / -8 degrees LCR-1200 - gain: 44 dB - 30 Hz: 0.29 dB roll-of - 20 kHz: 0.32 dB roll-of - phase shift 18 / -16 degree...

Mr. Docali's white-paper set me of on a certain track, by using a 1200 ohm LCR and a 1200 ohm termination resistor. These in parallel, offer the step-up with the proper 600 ohm load, according to its design specs. Sounded like a sensible proposition, but something kept stirring and didn't feel right...

This is quite a coincidence. It was your paper that started me off in this direction in the first place! Thank you for your study, and thank you for bringing it under my attention once more! The impact of misalignment between input and output resistance for the LCR is now very clear to me. To the co...

Hi Dave, I hadn't touched Spice until you set me on track in november and I am having a great deal of fun and insight since. Thank you for that! I agree that the rolling-of at low frequencies is not that big of a deal, but how about the associated phase shift? Usually phase-shift is regarded as a ne...

I had already foreseen that the output Z of the network would be 300Ω, and that that would increase the low-frequency response of the step-up. However, the primairy impedence will fall with frequency and will shunt part of the reflected load. Surely your friend lost some gain at low frequency? The ...

I have been following the forum for quite some time now and have read numerous topics with great interest. Thank you and hello to you all! I am at the moment working on a phono design and got stuck in my ambitions. Perhaps they are too high, or perhaps I am overlooking something. My goal is a 2-stag...