Musical Fidelity A1 Integrated Amplifier - Black

The Amplifier With the Famously Hot Lid

The original A1 arrived in 1985 and became notorious for a top plate you could not comfortably touch. That was the point: the finned lid is the heatsink for output transistors biased deep into Class A. The sound made it a classic; the heat made it a headline.

This is the reissue. Musical Fidelity kept Tim de Paravicini's original circuit and changed everything around it. The chassis is wider, with more heatsink area. The transformer is bigger, the boards are better, and the parts are rated for more heat.

The output stage is Class A/B. It is rated for 25 pure Class A watts into 8 ohms. Push it past that and it slides into Class B instead of switching over sharply, so you do not hear the handover. Damping factor is 150.

Analog Only, and Unapologetic About It

There are no digital inputs, no DAC, no Bluetooth, and no streaming. The A1 is built around five RCA line inputs. The selector reads CD, Tuner, Tape, Aux 1, and Aux 2, with phono beside them. Every socket is RCA. There is no balanced connection.

The phono stage takes both moving-magnet and moving-coil cartridges. Pick MC and gain rises to 60dB. Input impedance drops to about 1 kilohm on its own. The manual puts the usable moving-coil range between 100 and 800 microvolts.

What the Normal/Direct Button Really Does

The unlit button between the dials skips the gain block ahead of the volume control. That cuts about 10dB. Modern sources put out far more signal than 1985 expected, so this hands you back the useful part of the volume dial.

Outputs are a fixed Tape Out and a variable Pre Out, both RCA, plus one pair of binding posts. Volume runs through a motorised ALPS RK pot. That is why the metal remote in the box can drive it. The 1985 original had no remote at all.

Yes, It Still Runs Hot

Herb Reichert measured the top plate at 140.1°F, or 60°C, for Stereophile. That is about five degrees cooler than the original's design target. It is still too warm to rest a hand on. Give it open air above and at the sides, and put nothing on the lid.

What Reviewers Are Saying

Herb Reichert reviewed the A1 for Stereophile in October 2024. It became the magazine's Budget Product of the Year. He wrote that it "engages my brain's right and left hemispheres in roughly equal fashion", and that this is "something very few amps at any price can do".

On vinyl he went further. Of all the integrated amplifiers he has owned or reviewed, he found "none with a moving magnet phono stage that impressed me more than the A1's". What Hi-Fi? called the sound "Bold, smooth and effortlessly musical" in August 2023.

What Hi-Fi? names the practical limits, listing "Still runs very hot", "Needs care in partnering", and "Limited features" among its cons. The heat and the speaker matching are the two to plan around before it arrives.

Who Is This Amplifier Best For?

• You want the Class A sound that made the name — the original circuit, built with modern parts and a power supply that no longer cooks itself.
• Vinyl is your main source — the MM stage drew the strongest praise in the Stereophile review, and the MC option handles cartridges from 0.1 to 0.8mV, so a low-output moving coil plays without an outboard step-up.
• You run efficient speakers in a small or medium room — 25 Class A watts went further than expected in reviews, but this is not an amp for difficult loads at volume.
• You have somewhere it can breathe — the lid is the heatsink, so it needs clear air and an open shelf, not a closed cabinet.
• If your music is digital, the A1 is pure analog — no DAC, no Bluetooth, no HDMI. One of our DACs on any of the five line inputs brings in streaming, computer audio and a TV with an optical output.

How Does It Connect to Your System?

A turntable goes to the phono input, with the MM/MC selection made on the amplifier and the ground lead on the post beside the sockets. A CD player, tuner, or streamer takes any of the five line inputs, all of them RCA.

Speakers connect to the single pair of binding posts. The Pre Out feeds a power amplifier or a subwoofer, the Tape Out runs at fixed level for a recorder, and the remote handles volume and mute. There is no headphone jack on this amplifier.

Pairs Well With

Building around the A1? Here are some good companions:

• Speakers: Efficient standmounts are the natural match for 25 Class A watts — see our Bookshelf Speakers.
• Turntable: The MM/MC phono stage is the heart of this amplifier — see our Turntables.
• Audio rack: The A1 needs open air around it, so give it a shelf of its own — see our Audio Racks.
• Cables: Everything here is RCA and binding posts — see our Speaker Cables and Interconnects.

Frequently Asked Questions

Does the A1 have a built-in phono stage?

Yes, and it handles both cartridge types. Moving magnet works straight away; selecting moving coil raises gain to 60dB and sets input impedance to about 1 kilohm automatically, suiting cartridges rated 0.1 to 0.8mV.

Does it have Bluetooth or digital inputs?

The A1 is entirely analog. To feed it from a digital source you will need an outboard DAC, or a streamer with analog outputs.

Why does this amplifier run so hot?

The output transistors are biased hard into Class A. That throws off a lot of heat by nature, and the top plate is the heatsink. Reviewers measured about 60°C on the lid. It also draws real power while sitting idle.

Can it drive large or power-hungry speakers?

Not the difficult ones. Reviewers drove low-sensitivity standmounts with it more happily than the 25-watt rating suggests, but it is best matched to efficient speakers in a small or medium room.

What does the Direct switch do?

It skips a gain stage ahead of the volume control and drops gain by about 10dB. That helps with loud modern sources and sensitive speakers. You get usable range on the dial, instead of everything happening in the first inch.

Is this the same as the 1985 original?

The circuit is, on purpose. The chassis is larger. The transformer is now dual-mono with split-rail windings, the parts are rated for more heat, and there is a remote. The brief was reliability, not redesign.

See It in Action

Steve Guttenberg shares his hands-on impressions of the revived A1:

Zero Fidelity reviews the A1's sound, heritage, and value:

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