Welcome to
PHONOPREAMPS.COM
How to Determine Whether You Actually Need a Phono Preamp
(Preferably Before You Buy One!)
The vast majority of customer service contacts and product returns in our industry involve folks who (often on the advice of a friend, social media, or internet blog) have purchased phono preamps which they simply do not need. Unless you have more than one turntable, two phono preamps is one too many. Most 'defective preamp' reports are actually the result of connecting two phono preamps in series; ours and one which the buyer is unaware already exists in his or her audio system. Doing this produces TERRIBLE audio; overdriving the second preamp in-line with 100 times the proper signal level causes hum, boomy bass, and massive distortion. If you know your audio system has no phono preamp, ours are just what you need and we'd love your business! But if you are unsure whether you already have a preamp, if you are already successfully listening to your vinyl, or if your intended usage of our product doesn't include connecting it to a turntable, read on...
You already HAVE a phono preamp if your
receiver or amp has an input labeled PHONO.
Simply connect your turntable directly to it.
Connection of an external phono preamp (ours or any other) to jacks labeled PHONO like the ones at right will ALWAYS cause hum,  overloading and distortion. DO NOT DO THIS! Instead (assuming your plan is to upgrade your system's fidelity by using our superior product, or you want to connect a second turntable), connect the external preamp's output to any available line level input on your receiver or amp. See below.
phono input jack


line inputs suitable for connecting a phono input



soundcard jack panel
The audio line input jacks shown at left are all good places to connect a phono preamp. If the input chosen includes video jacks, leave them empty. Some analog inputs may share labels and functions with digital / HDMI ones which are already in use and have priority. If you get no sound, simply try a different input. See your receiver's user manual if you encounter this; it will explain how digital and analog jack use is prioritized. Never connect a phono preamp to jacks labeled OUTPUT, SUBWOOFER, ZONE 2, MULT-CHANNEL INPUT,  or PREOUT.


If connecting a phono preamp output to a computer for recording, use the soundcard LINE-IN (blue) jack. Do not use the MIC (pink) input; the result will be distorted
.
You already HAVE a phono preamp if your
turntable has USB, or if it has a phono / line
or equalizer switch (usually located at the rear).
Connect your table DIRECTLY to your amp or receiver via a line input such as AUX or CD. If your receiver has a PHONO input, use it instead (because its preamp is almost certainly the better one). Set the turntable's bypass switch as follows.

Bypass switches that turn off the internal preamp and allow use of an external preamp instead vary in labeling and location depending on turntable brand (see at right). To use the table's preamp, set as shown in BLACK, and connect the turntable directly to a line input on your receiver. Most preamps built into turntables produce inferior quality audio and are very noisy (typically <50dB S/N); even our least expensive models easily outperform these. To use one of our preamps instead of your turntable's internal one, set the table's bypass switch as shown in RED. This is also the correct switch setting when connecting the table directly to a receiver or amp PHONO input.



Here are some of the more common brands and models likely to include built-in preamps;


- Audio Technica (most models)
- Sony (PS-LX250, PS-LX300, PS-LX300USB)
- RCA, Optimus, Realistic LAB series (recent)
- Denon, Marantz, Teac, Pyle, Numark (some)
- Pioneer (PL-990, PL-30K)
- Aiwa (most models)
- Sherwood F-700, Pro-Ject Debut III, Carbon USB
phono / line switches
Typical bypass switch labeling;
PHONO / LINE
EQ OFF / ON
BYPASS ON / OFF
THRU /  ON


If you hear hum, overloading and distortion (or should you hear nothing at all), you probably have the switch set wrong. 


Only one turntable we know of has no switch allowing its  preamp to be bypassed: the Pioneer PL-990.

Lastly, you should not buy a phono preamp if you intend to connect
  anything (
smart phone, MP-3 player, TV audio, laptop or tablet... whatever)
other than a magnetic cartridge turntable to its input.
THIS WILL NOT WORK!


home