The typical gain for a phono preamp is between 40 and 60 dB. This is necessary because phono cartridges produce a very weak signal, typically less than 5 mV. The preamp boosts this signal to a level that can be used by a line-level amplifier or receiver.
The exact gain of a phono preamp will depend on the type of cartridge being used. Moving magnet (MM) cartridges typically have a higher output level than moving coil (MC) cartridges, so they require less gain.
Here is a table of typical gain requirements for different types of phono cartridges:
| Cartridge type | Gain requirement (dB) |
|---|---|
| Moving magnet (MM) | 40-45 dB |
| Moving coil (MC) | 50-60 dB |
It is important to note that the gain of a phono preamp should be matched to the output level of the cartridge. If the gain is too high, it can cause distortion. If the gain is too low, the signal may be too weak to be heard properly.
Many phono preamps have adjustable gain, which allows you to match the gain to the specific cartridge that you are using. If you are unsure of the gain requirement for your cartridge, consult the manufacturer’s documentation.
In addition to gain, phono preamps also apply RIAA equalization. RIAA equalization is a curve that is applied to the signal to compensate for the frequency response of vinyl records.
When choosing a phono preamp, it is important to consider the type of cartridge that you will be using and the gain requirement of that cartridge. It is also important to choose a preamp with good sound quality and RIAA equalization.
Here are some additional tips for choosing a phono preamp:
- Make sure that the preamp has the correct gain for your cartridge.
- Choose a preamp with good sound quality.
- Make sure that the preamp has RIAA equalization.
- Consider your budget. Phono preamps can range in price from a few hundred dollars to several thousand dollars.
If you are serious about vinyl playback, then a good phono preamp is an essential piece of equipment. By following the tips above, you can choose a phono preamp that will provide you with the best possible sound quality.
