How much db gain is needed for 0.55mV output MC cartridge - diyAudio
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Old 9th November 2009, 11:37 AM   #1
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Default How much db gain is needed for 0.55mV output MC cartridge

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
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Old 9th November 2009, 11:43 AM   #2
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What output voltage do you need?
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Old 9th November 2009, 12:04 PM   #3
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I need 2.5V RMS for my preamp.
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Old 9th November 2009, 12:36 PM   #4
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Well, if you really need such a high output voltage, you would need 73dB Gain.
20*log(2.5/0.00055)

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Old 9th November 2009, 12:51 PM   #5
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Actually I don't know. What is a normal voltage to drive a preamp?
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Old 9th November 2009, 01:29 PM   #6
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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.
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Old 10th November 2009, 12:11 PM   #7
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What is the Gain of your Preamp?

But PigletsDad's guess with 60dB might be a good start...
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Old 10th November 2009, 12:22 PM   #8
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Quote:
Originally Posted by Sunsun22 View Post
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.
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Old 10th November 2009, 12:32 PM   #9
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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.
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