For hum noise problem:
In normal, there is some low humming noise.not loud. (Because the phono preamp is amplifier the signal to about 800-1000 times, the MM source signal voltage is 3 ~ 5mV, MC source is 0.3 ~ 0.8mV, need amplifier up to 1.2 ~ 2V, (so, if any noise in the signal, it's will be same loud too.) you can try follow step to be sure is in lowest. 1. Must be sure the the GND point is connect to real earth.you can test it.using your finger touch the GND point. Is the humming noise come to lower? If yes.that's mean the GND cable not in good connect, if the humming noise is same, no change lower.that's good. 2. Using some better audio connect cable, and move this valve preamplifier little far from power or TV or other Electric device. 3. Connect the transformer case box to GND too.
- RIAA phono stereo
- RIAA freq response 20hz-20kHz +/- 0.5dB, S / N ratio> 92dB
- THD <0.05%, input sensitivity 3.0mV, gain 50dB
- Nominal / max output 300mV / 1.8V
- Output impedance 200 ohms, input 47k ohm / 220 pF
- gold-plated jacks
- ground interace
- Net Weight: 3KG
- Size: L245 * W208 * H90mm
- 3x 6N2 tube (low noise tube) + 1x 6Z4 tube
- 1 x Phono preamp
- 1 x Power cord
Eligible For Free Shipping
- This is our Douk audio own brand Nobsound, Nobsound NS-10G Pro is an incredible pure tube phono preamplifier. It's the Little Bear T10 latest upgrated version, with Hi-end Aluminum chassis, basically no background noise.
- This class A preamplifier provides warm and classic voice, really makes a huge deal on the quality of sound.
- Using Hi-end Toroidal Transformer; Output GAIN option: you can set it "LOW or HIGH" output; Coupling capacitors all using HiFi WIMA audio capacitor, best model. Very low noise and clear sound output.
- It supports 2 model tube (6N2 / 12AX7): On the PCB there have 3 switch, please note, the switch need turn on the same tube mode.(6N2 can be replaced by 6H2,6H2n, and 12AX7 can be replaced by 12AX7B, 6N4 (9PIN), ECC83,5751 .etc)
- NOTIC: This preamp is using for MM (Moving-MaganeticCartridge) turntable only.do not support MC truntable, also not support CD or other similar player.