Prototype OTOMON LAB LCR preamp with phono stage and line stage separated power supply

You can order MC step up transformer so that you can use with MC cartridges.

What is the best schematic for phono RIAA, of course it is LCR, LCR make very low signal loss, sound is more musical, beautiful note. CR type has beautiful note in sound but easy to get hum, NF type can reduce the hum but actually it uses negative feedback to make the equalizer curve, so the sound is not natural. LCR resolve all above problem, it doesnot have negative feedback so the sound is very beautiful.

LCR has very low input impedance to compare to CR type, so hum come from input signal will be reduce much.

Tubes using is 12AX7x2, 5687x2, 6DJ8x2, EZ81x1, I include tube with amplifier.

You can order to use another tube for prestage or AUX line output.

Specification:

Preamp:
Response frequency: 16Hz ~ 80Khz
THD: 0.1%
Hum level: under 0.07mV

LCR phono stage:
Response frequency 20Hz ~20Khz
THD:0.1%
Hum level: -85db