Whats the benefit of an external preamp if the tt i am considering already has a built in phono preamp? the signal to noise ratio is 55db i believe.

It's completely redundant and unnecessary unless quality of sound is your concern. In theory, an high-quality external phono preamp will sound better -- or even much better -- than the cheap one built into your turntable. But everything varies, and since this preamp costs like 1% of a the cost of a serious high-end phono preamp, it's possibly no better than the one that's built-in. Also, your turntable *must* have a switch to bypass its internal preamp, or else you won't be able to use an external one at all (you can't feed a phono preamp into another phono preamp).

What advantage does the 1000ma ac adaptor have vs. the less expensive 500ma version?

It's commonly held among audiophiles that almost any amplifier can be made to sound better if more and cleaner current can be made available by up-sizing the power supply. This SMPS regulated adaptor can supply twice the current our standard one provides.

Does this filter out under 20Hz (could be a band-pass for 20Hz-20kHz)?

Frequency response drops off sharply below 20Hz; down 10dB at 10Hz. 20dB at 6Hz.

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Technolink TC-750 Audiophile RIAA Phono Preamp, 85dB S/N, Black or Silver, Your Choice (Black)

Technolink TC-750 Audiophile RIAA Phono Preamp, 85dB S/N, Black or Silver, Your Choice (Black)

Product ID: 101224635

🎧85dB S/N ratio for pristine sound

🔌Gold-plated jacks & anodized casing for ultimate connectivity

🎚️40dB MM gain for perfect vinyl clarity

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Description

🎶 Elevate your vinyl game — because your records deserve the best!

PRECISION MM GAIN - 40dB gain tailored for moving magnet cartridges delivers balanced, dynamic sound.
READY OUT OF THE BOX - Includes RCA cable, miniplug adapter, and regulated 12V DC power supply for seamless setup.
AUDIOPHILE GRADE CLARITY - Experience vinyl like never before with a 20Hz-20kHz ±0.5dB frequency response that captures every nuance.
PREMIUM BUILD SHIELDING - Gold-plated connectors and anodized metal casing guarantee optimal signal integrity and durability.
ROBUST SIGNAL TO NOISE RATIO - An impressive 85dB S/N ratio ensures your music stays pure, free from distracting background noise.

The Technolink TC-750 is a high-performance RIAA phono preamp designed for audiophiles seeking crystal-clear vinyl playback. Featuring a wide frequency response (20Hz-20kHz ±0.5dB), a strong 85dB signal-to-noise ratio, and 40dB MM gain, it ensures your analog sound is faithfully reproduced. Its premium gold-plated jacks and anodized metal casing provide superior connectivity and shielding, while included accessories and a lifetime limited warranty make it a reliable, ready-to-use solution for discerning music lovers.

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