Short answer: A phono preamp (also called a phono stage or RIAA preamp) makes a turntable cartridge’s tiny, specially equalized signal usable by ordinary amplifier inputs. It boosts the signal to line level and applies the inverse of the RIAA recording curve. Your system needs one phono stage somewhere: built into the turntable, built into a receiver or amplifier, or provided by a separate box.
To identify the right connection, find out whether the turntable is outputting PHONO or LINE. Connect LINE output to AUX, CD, TAPE or another line input. Connect raw PHONO output to a compatible PHONO input, or put an external phono stage between the turntable and a line input. Never send an already-preampified LINE signal into another active PHONO input.
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What a phono preamp actually does
A phono cartridge does not produce the same kind of signal as a CD player, streamer or other line-level source. Its output is much smaller and follows the equalization used when records are made.
It raises the cartridge signal
Lenco’s support explanation, modified 21 January 2025, gives useful approximate examples: a PHONO signal may be around 5 mV, while a LINE signal may be around 150–200 mV. Those are illustrative values, not universal specifications. Cartridge output, amplifier sensitivity and phono-stage gain vary by model.
#1 Best Overall
- Converts phono signals: a turntable preamp that converts phono signals to line level signals. This state-of-the-art circuitry phono preamp can accommodate magnetic pickups with an input sensitivity of 3mV at 50K ohms
- Low noise operation: offers outstanding performance with it’s low-noise Audio operational amplifiers. The output is 2V max (p-p) at 10K ohms. It’s better to position the preamp close to the source to reduce unwanted noise and interference
- Connects to turntables: connect any Turntable to modern sound equipment without specialized phono input for amplifying music. For the receiver, This can be connected to speakers, computers, laptops and more
- Simple plug & play: This mini preamp has stereo RCA inputs and stereo RCA outputs. Connect the Turntable to the RCA inputs and ground. Then, connect the amplifier Receiver to the RCA outputs
Without enough gain, a receiver connected to a turntable will produce only a very quiet sound, even when the cables are connected correctly. The phono stage supplies the additional amplification needed before the signal reaches a normal AUX, CD or LINE input.
It restores the record’s frequency balance
Records are cut using the RIAA curve: bass is reduced and treble is increased during recording to fit the groove and control noise. During playback, the phono stage applies the complementary equalization, restoring the intended tonal balance by bringing bass back up and reducing the relative treble emphasis. This is why a phono stage is more than an ordinary volume booster.
Tom Broer-Broeren’s Lenco support article describes the two functions as amplification to LINE level and RIAA equalization. A stage that supplies gain but does not provide the required RIAA playback equalization is not a complete phono stage.
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Where the phono stage can be located
You do not necessarily need a separate component. The required stage may already be part of another device.
Rank #2
- Tube MM Phono Preamplifier: This Fosi Audio phono preamplifier removes low-frequency noise and ensures clear sound quality by converting phono signals to line-level signals using high-quality components and low-noise integrated circuits. It is designed to safeguard your turntable thanks to its grounding post
- 3 Switchable Gain Modes: You can switch between 3 modes: 39, 42, or 45 dB. High compatibility and customizable control are provided by the adjustable gain levels. Also, it has very good circuitry and entry-level, high-end analog sound
- Tube Preamplifier: With a 3.5mm AUX input, it's also a tube preamp. Fosi Audio used high-quality component parts for the design and assemblage of this phono preamplifier. You can enjoy a very warm and smooth sound
- Applicable Vacuum Tube Model: The compatible vacuum tube models are 6K4, 6J1, 6J4, GE5654, 6AK5, 66, etc. To make changes to your stereo system yourself, simply swap out the vacuum tubes. Consider that distinct tubes produce various sounds
- Package Content: You will get 1 x Box X2 phono preamp, 2 x vacuum tubes, 1 x RCA cable, 1 x power adaptor, and 1 x user manual
| Location | What the turntable outputs | Where that output goes | What to check |
|---|---|---|---|
| Built into the turntable and switched on | LINE | AUX, CD, TAPE, LINE IN or another line input | Confirm the PHONO/LINE switch is in LINE or that the manual identifies the output as preamplified. |
| Built into a receiver or integrated amplifier | Raw PHONO | The receiver’s compatible PHONO input | Verify that the input supports your cartridge type and output level. |
| Separate external phono stage | Raw PHONO into the stage; LINE out of the stage | Stage output to AUX, CD, TAPE or LINE IN | Match MM or MC requirements, gain, loading, RCA connections and grounding. |
| No suitable stage anywhere | Raw PHONO | No direct usable connection yet | Add a compatible external phono stage before connecting to a line input. |
Some products contain more than one option. A turntable may have a switchable internal stage, while an amplifier may also have a PHONO input. In that case, select one stage and bypass the others.
How to check your own setup
Use the labels on the hardware together with the manuals. Appearance alone cannot confirm whether a stage is active or whether an input supports your cartridge.
- Inspect the turntable. Look at the rear panel for a PHONO/LINE switch, a built-in preamp label, or a manual statement that the RCA sockets provide line output. If the switch is set to LINE, the turntable is expected to provide a preamplified signal. If it is set to PHONO, the output is the cartridge-level signal that still needs a phono stage.
- Inspect the receiver or amplifier. Find an input labelled PHONO. Older equipment may use labels such as gram, RIAA or record player. Read the manual to confirm the input’s cartridge type, gain and loading; a label by itself does not guarantee compatibility.
- Map every connection. A turntable LINE output belongs on a line input such as AUX, CD, TAPE or LINE IN. A raw PHONO output belongs on a suitable PHONO input or on the input of an external phono stage.
- Count the active stages. There should be one phono stage in the signal path. An enabled turntable preamp or an external stage must feed a line input, not another PHONO input.
- Check the cartridge. Identify whether the cartridge is moving-magnet (MM), high-output moving-coil (MC) or low-output MC, then compare its output and loading requirements with the selected PHONO input or external stage.
- Connect the ground lead when required. If the turntable has a separate ground wire, attach it to the matching ground terminal on the receiver or external stage when the equipment instructions call for it. Correct grounding can be important for avoiding hum, but follow the particular manufacturer’s guidance.
Correct connection for each common arrangement
Turntable with a built-in stage switched to LINE
- Set the turntable’s selector to LINE, if it has one.
- Connect its left and right RCA outputs to AUX, CD, TAPE or LINE IN on the receiver, integrated amplifier, powered speaker system or other line-level destination.
- Select the same input on the amplifier.
- Do not use the amplifier’s PHONO input for this signal. The turntable has already performed the phono gain and RIAA equalization.
If the sound is unexpectedly quiet in this arrangement, recheck the switch position and the manual. A turntable that looks similar may provide only raw PHONO output.
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Turntable with raw PHONO output and an amplifier PHONO input
- Leave the turntable in PHONO mode, or use it as supplied if it has no internal stage.
- Connect the RCA cables to the amplifier’s PHONO sockets.
- Connect the turntable ground lead to the amplifier’s ground terminal if specified.
- Select PHONO and set the volume at a low level for the first check.
This arrangement uses the amplifier’s built-in stage. Do not add another phono preamp between the turntable and that PHONO input.
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- RCA-type input R/L
- RCA-type output R/L
- Ground terminal
- Power Adapter Included
Turntable with raw PHONO output and no compatible PHONO input
- Connect the turntable RCA outputs to the external phono stage’s RCA inputs.
- Connect the turntable ground lead to the stage’s ground terminal when required.
- Connect the stage’s line-level RCA outputs to AUX, CD, TAPE or LINE IN on the amplifier.
- Select that line input on the amplifier. The external stage is now the only active phono stage.
Turntable LINE output connected to a PHONO input
This is the double-stage error. The amplifier’s PHONO circuit adds gain and RIAA equalization to a signal that already received both. The result can be excessively loud, distorted or tonally wrong. Move the cable to a line input, or switch the turntable to PHONO and use the amplifier’s PHONO input instead—never both stages at once.
PHONO and LINE are not interchangeable labels
| Label or mode | Meaning | Typical destination | Stage status |
|---|---|---|---|
| PHONO | Low-level cartridge output requiring phono gain and RIAA equalization | Compatible PHONO input or external phono-stage input | Stage still needed downstream |
| LINE | Preamplified, RIAA-equalized output | AUX, CD, TAPE, LINE IN or another line input | Stage already active upstream |
| PHONO input | An input that contains a phono stage | Raw output from a compatible cartridge | Stage is inside the amplifier or receiver |
| AUX/CD/TAPE/LINE IN | Ordinary line-level input | Turntable LINE output or external stage output | No phono gain or RIAA equalization is normally provided |
“PHONO,” “gram” and “RIAA” are common names for a phono input, but equipment varies. The manual is the authority when a label and the specifications appear to conflict.
Cartridge matching: MM, high-output MC and low-output MC
The presence of a PHONO socket does not mean every cartridge will work correctly. A stage must provide suitable gain and input loading for the cartridge’s electrical output.
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Cambridge Audio’s guidance for the AXR85/100 receiver, published 26 March 2024 and revised 15 October 2025, is model-specific. It states that this receiver’s built-in PHONO input accepts MM and high-output MC cartridges with 2–6 mV output and a 30–50 kOhm load impedance. It says low-output MC cartridges below 1 mV, usually using 10–1000 Ohm loading, cannot be connected directly to that input and require a matching transformer or a suitable phono preamp.
Rank #4
- Convert Phono Signal: The turntable preamp converts phono signals to line level for better sounding audio and volume.This state-of-the-art circuitry phono preamp can accommodate magnetic pickups with an input sensitivity of 3mV at 50K Ohms Please make sure that the turntable you are connecting to use does not have a built-in preamp, if it does then using this phono preamp may result in bad noise.
- Low Noise Operation: The phono preamp offers outstanding performance with it’s Low-Noise Audio Operational Amplifiers.The output is 2V max (P-P) at 10K Ohms. It’s better to position the preamp close to the source to reduce unwanted noise and interferenceMake your vinyl records deliver sound exactly as it's read from your turntable's needle.
- RCA Input & RCA Output: This mini preamp has stereo RCA inputs and stereo RCA outputs. Connect the turntable to the RCA inputs and ground Then, connect the amplifier receiver to the RCA outputs(DC 12V Adapter is included).
- Simple Plug & Play: Connect any phono turntable preamps to modern sound equipment without specialized phono input for amplifying music.Simply hook up the preamp to both turntable and audio device so you can enjoy vinyl in no time.For the receiver, this can be connected to speakers, computers, laptops and more
- 1 Year Warrranty: We guarantee this electric phono preamplifier with both a 30-day, no hassle money back return policy and a 1 year manufacturer’s guarantee.
Those figures describe the AXR85/100, not a universal definition of MM, MC or receiver capability. A different amplifier may have different gain, loading and cartridge limits.
What to verify on any stage
- Cartridge type: Confirm MM, high-output MC or low-output MC.
- Output voltage: Compare the cartridge’s stated output with the stage’s input range and gain.
- Gain: Too little gain leaves the signal quiet; inappropriate gain can overload the input.
- Loading: Check the specified resistance and, where applicable, capacitance. Loading is part of electrical compatibility, not an optional sound preference.
- Connections: Confirm left/right RCA inputs and outputs, plus a ground terminal if your turntable requires it.
Example of an external phono stage’s specifications
Emotiva’s PH1 documentation lists support for both MM and MC cartridges. Its published specifications are 40 dB gain for MM, 60 dB gain for MC, 47 kOhm MM input impedance and 100 Ohm MC input impedance. The unit uses RCA inputs, a ground terminal and line-level outputs.
| PH1 specification | Manufacturer-published value | How to use the information |
|---|---|---|
| MM gain | 40 dB | Compare with the MM cartridge’s output and the rest of the system. |
| MC gain | 60 dB | Check that the MC mode and gain suit the cartridge’s output. |
| MM input impedance | 47 kOhm | Compare with the cartridge manufacturer’s recommended load. |
| MC input impedance | 100 Ohm | Confirm that the low-output or other MC cartridge is intended for this load. |
| Physical connections | RCA input, RCA line output and ground terminal | Verify that your cables and grounding arrangement match. |
These are specifications for that model, not a listening test, independent performance rating or recommendation that it is better than a correctly matched built-in stage.
Troubleshoot by the symptom
| Symptom | Most useful checks |
|---|---|
| Very quiet sound | Check whether the turntable is sending raw PHONO into a line input. If so, use a compatible PHONO input or add an external stage. Also verify that a switchable turntable is not set incorrectly. |
| Loud, harsh or obviously distorted sound | Look for a LINE output connected to a PHONO input, or two active stages in series. Move the cable to AUX/CD/LINE IN or disable the turntable’s internal stage and use the receiver’s PHONO input. |
| Thin or bass-light playback | Confirm that the signal passes through RIAA equalization. A raw PHONO output on a line input will not have the required playback correction. |
| Hum or buzz | Check RCA plugs, left/right connections and the turntable ground wire. Attach the ground to the matching terminal when the manuals call for it, and avoid assuming every device uses grounding in exactly the same way. |
| No output from a supposedly compatible PHONO input | Verify cartridge type, output voltage, input selection and cable seating. A PHONO input designed for MM or high-output MC may not provide enough gain or suitable loading for a low-output MC cartridge. |
Do you also need an amplifier?
A phono preamp and a power amplifier solve different problems. The phono stage converts the cartridge signal to line level; an amplifier supplies the power needed to drive passive speakers. Fluance’s support guidance makes this distinction explicitly. Therefore, a turntable with a built-in phono preamp can still require an amplifier or powered speakers, while an amplifier with a PHONO input already contains the phono-stage function but may still need speakers connected to its power-amplifier outputs.
Best Value
- CONVERTS PHONO SIGNALS: A turntable preamp that converts phono signals to Line Level Signals. This state-of-the-art circuitry phono preamp can accommodate magnetic pickups with an input sensitivity of 3mV at 50K Ohms
- LOW NOISE OPERATION: Offers outstanding performance with it’s Low-Noise Audio Operational Amplifiers. The output is 2V max (P-P) at 10K Ohms. It’s better to position the preamp close to the source to reduce unwanted noise and interference.
- CONNECTS TO TURNTABLES: Connect any turntable to modern sound equipment without specialized phono input for amplifying music. For the receiver, this can be connected to speakers, computers, laptops and more.
- SIMPLE PLUG & PLAY: This mini preamp has stereo RCA inputs and stereo RCA outputs. Connect the turntable to the RCA inputs and ground. Then, connect the amplifier receiver to the RCA outputs. It also comes with a 12DC adaptor
- 1 YEAR WARRANTY: We guarantee this electric phono preamplifier with both a 30 day no hassle money back return policy and a 1 year manufacturer’s guarantee.
Diagnose these as separate questions: first ask whether the cartridge signal has been converted to LINE level, then ask whether the destination can provide power to the speakers.
When an external phono preamp is justified
Buy or add an external stage only after confirming that the existing turntable and amplifier do not already provide a suitable one. The practical reasons include:
- Your amplifier has only line inputs and the turntable outputs raw PHONO.
- Your cartridge type or output is not supported by the amplifier’s PHONO input, especially a low-output MC cartridge on an MM-only input.
- You need a particular gain, input impedance or connection arrangement that the built-in stage cannot provide.
- You want to relocate the stage to simplify cable routing or grounding.
An external unit is not automatically better sounding than a correctly matched built-in stage. Pro-Ject’s FAQ notes that an external stage can improve sound quality in some situations, but that is manufacturer guidance rather than independent comparative evidence. The first requirement is correct electrical matching and a single active RIAA stage.
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A purchase checklist
If your diagnosis shows that an external unit is necessary, compare these items before choosing a model:
- MM/MC support: Make sure the stage accepts your cartridge type. If the cartridge is MC, determine whether it is high-output or low-output.
- Gain: Match the available gain to the cartridge’s output voltage and the amplifier’s line-input sensitivity.
- Input loading: Check resistance and any capacitance requirement against the cartridge manufacturer’s guidance.
- RIAA equalization: Confirm that the unit is a true phono stage with RIAA playback equalization.
- Inputs and outputs: Verify stereo RCA sockets, cable length needs and a suitable line-level output.
- Grounding: Check for a ground terminal if the turntable uses a separate ground lead.
- Existing hardware: Ensure that no enabled internal turntable stage or amplifier PHONO circuit will remain in series.
- Current details: Check the manufacturer’s current specifications, availability and price at the time of purchase; these can change.
Quick decision guide
- Turntable says LINE; amplifier has AUX/CD: Connect directly to the line input. No additional phono stage is needed.
- Turntable says PHONO; amplifier has a matching PHONO input: Connect directly to PHONO and ground as instructed. No external stage is needed.
- Turntable says PHONO; amplifier has only AUX/CD: Add a compatible external phono stage between them.
- Turntable says LINE; amplifier has PHONO only: Do not use PHONO. Use a line input; if none exists, you need a different line-level destination or system component.
- Cartridge is low-output MC: Do not assume an MM PHONO input is suitable. Check the exact input specifications and use a matching transformer or MC-capable phono stage when required.
Bottom line
Every working vinyl playback chain needs one correctly matched phono stage, but it may already be inside the turntable or amplifier. Identify whether the turntable output is PHONO or LINE, match the cartridge to the input’s MM/MC, gain and loading requirements, connect LINE to a line input, and keep only one phono stage active. Those checks usually tell you whether you need to buy anything at all.
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