phono preamp


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phono preamp

An electronic circuit that amplifies and equalizes the analog output of the cartridge in a phonograph turntable. The output is boosted to a level equivalent to other audio sources such as tapes and CDs, and RIAA equalization is required to restore the original signal. Typically built into an audio or A/V receiver, phono preamps also come as external devices for units without phono inputs as well as for audiophiles who want the highest-quality restoration. External phono preamps are also used for turntable-to-computer applications (see USB turntable).

The RIAA "Curve"
When vinyl masters are cut, frequencies below 1 KHz are attenuated (reduced) to prevent the stylus from crossing over into the previous groove. In order to eliminate noise from the disc surface, higher frequencies are amplified. The phono preamp's RIAA equalization boosts the lows and attenuates the highs to recreate the original analog signal. See turntable, phono input and microphone preamp.


High-End Phono Preamp
The PH-1 from Grado Labs is used by audiophiles to restore the frequencies in the vinyl record as close to the original as possible. As is evident from the jacks on the back, a phono preamp does a straighforward job: signal in - restore - signal out. The power supply connects to the four-prong jack, and the turntable is grounded to the post in the middle. (Image courtesy of Grado Laboratories, www.gradolabs.com)
References in periodicals archive ?
Use a good turntable and phono preamp to ensure that the cartridge's sound will dominate.
If not, then the interconnects plug into a phono preamp.
Direct comparisons in this review are with my Parasound P/PH-100 phono preamp.
The PH-1 phono preamp is a relatively new addition to their list of products.
When I first connected the Marchand Electronics phono preamp to my system, I found out three things.
I then used the sound level meter to identify and mark volume settings for each phono preamp that would provide equal sound levels.
My selections were: Grado Platinum, Shure V15VxMR, and Clearaudio Aurum Beta, all high-output devices that most phono preamps should handle without a problem.
Long after purchasing and testing the Rotel RQ-970BX, I ran across a number of ads in audio catalogs for outboard phono preamps from Creek, Sumiko, and Parasound.
Its only drawbacks were its considerable weight, no handles, no headphone jack, no phono preamp, and a cost that will put it out of the reach of many.
The JBL Authentics L16 also boasts all-around connectivity via AirPlay, DNLA and Bluetooth, as well as analog, optical, and on board moving coil and moving magnet phono preamps.
In that same vein, in both this and our next issue, we will feature reviews of equipment with ties to the LP era, as Kevin East, our resident carouselier, gives us his spin on phono preamps, cartridges, and the like--plus some thoughts on using some of the newest digital technology to try and preserve those fading records of the past (bringing to mind the recent application of the latest digital technologies to both preserve and illuminate ancient texts such as the Dead Sea scrolls).
Other innovations included the introduction of DC servo circuits (Theadra, 1975) and very low-noise phono preamps that did not need a pre-preamplifier stage.