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.

Technolink Tc 750 Audiophile Riaa Phono Preamp 85db S N

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Description

🎵 Elevate your vinyl game with Technolink TC-750 — where every groove counts!

VINYL REVIVAL MASTERY - Experience your records with crystal-clear 40dB gain tailored for MM cartridges.
PLUG PLAY CONFIDENCE - Includes RCA cable, miniplug adaptor, and regulated 12V power supply for seamless setup.
PRECISION SOUND TUNING - Flat frequency response from 20Hz to 20kHz keeps your music true to the original.
BUILT TO LAST IMPRESS - Durable anodized metal casing with gold-plated jacks for premium connectivity and shielding.
AUDIOPHILE GRADE CLARITY - 85dB signal-to-noise ratio ensures every note is pure, free from distracting hiss.

The Technolink TC-750 is a high-fidelity RIAA phono preamp designed for audiophiles seeking superior vinyl playback. Featuring a 40dB gain for MM cartridges, an 85dB signal-to-noise ratio, and a precise 20Hz-20kHz frequency response, it delivers clean, authentic sound. Its robust anodized metal body with gold-plated connectors ensures durability and optimal shielding. Available in sleek black or silver, it comes complete with essential cables and a regulated power supply, backed by a lifetime limited warranty.

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