How much db gain is needed for 0.55mV output MC cartridge

[Sunsun22]

I have had a phono amp which was very clear on DIP setting on cartridge output in mV. Recently, I changed to a new phono amp that only stays XX db gain on soldering a feedback resistor. My cartridge is 0.55mV output, how much db gain I needed? Thanks

 

[richie00boy]

What output voltage do you need?

 

[Sunsun22]

I need 2.5V RMS for my preamp.

 

[atarashi]

Well, if you really need such a high output voltage, you would need 73dB Gain.
20*log(2.5/0.00055)

Michael

 

[Sunsun22]

Actually I don't know. What is a normal voltage to drive a preamp?

 

[PigletsDad]

The difficulty with levels is because CD sources are rated by maximum output level (typically 2Vrms), while vinyl levels are at nominal values, corresponding to 5cm/s stylus velocity. Most cartridges can track much more than this; in the treble range some can do well over 50cm/s, corresponding to peaks that are 20dB above nominal.

In my system, 0.5V nominal output from the phono stage is a convenient value, but it obviously depends on the whole system. With 0.55mV source, this is close enough to 60dB of gain.

 

[atarashi]

What is the Gain of your Preamp?

But PigletsDad's guess with 60dB might be a good start...

 

[peranders]

I have had a phono amp which was very clear on DIP setting on cartridge output in mV. Recently, I changed to a new phono amp that only stays XX db gain on soldering a feedback resistor. My cartridge is 0.55mV output, how much db gain I needed? Thanks

2.5 Vrms sounds much as output voltage. The best thing you could do is actually listen and adjust according to that.

 

[SoNic_real_one]

The analog "Line" input of the amplifiers is calibrated nominaly to 0dBu at 0.775mVrms. The "CD" analog input should be calibrated to +4dBu to admit a nominal 1.23Vrms.