SKU: 71542539009

Musical Fidelity A1 - Integrated Amplifier

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Description

Musical Fidelity A1 - Integrated AmplifierA1 Overview In Hi Fi, the Musical Fidelity A1 has become one of the most classic designs inside and out. First released back in 1985, it quickly made waves for being an absolute beast when it came down to driving some of the most difficult speakers of that time, even though it was actually a rather low powered integrated amplifier. But: it was all done in pure Class A with excellent and expertly laid out discrete symmetrical circuitry topology and

 

A1 - Overview

In Hi-Fi, the Musical Fidelity A1 has become one of the most classic designs – inside and out. First released back in 1985, it quickly made waves for being an absolute beast when it came down to driving some of the most difficult speakers of that time, even though it was actually a rather low powered integrated amplifier. But: it was all done in pure Class A with excellent and expertly laid out discrete symmetrical circuitry topology and using only highest quality components. The A1 showed people that there was more to amplifiers than just high power.

 

 

Based on its huge success, the A1 has gone through multiple reissues and new versions over the years.

Now for 2023, for the first time since its initial release we have actually kept all specifications, the appearance and circuits of the 1985 rendition for those who missed out the first time. With an updated transformer, power supplies and modern low noise components we’ve revitalized the formula and are proud to reintroduce the fresh original – three decades later.

Technical Talk

The A1 is built around a completely discrete and symmetrical Class A topology. It‘s able to output 25W of pure Class A power @ 8 ohms load with 25A of maximum output. While the numbers here might seem rather low, the ability for the output stage to drive difficult speakers is a small miracle in itself. The amp design being dynamic class A, and if Class A standing current is exceeded, it will automatically allow more. It therefore “slides” (NOT “switches”) smoothly into class B style operation, temporarily allowing the further current draw needed.

Power Supply

The new A1 has received an updated transformer from shared (1985 original) to more efficient “dual mono split rail” windings. The amp stages are supplied by fully independent left and right power supplies for better power handling and stereo imaging and each power amplifier now has double supply capacity resulting in reduced ripple and noise.

The transformer‘s noise and heat dissipation are reduced due to better efficiency and updated components. The main supplies are filtered for better regulation and reduced switch on surge.

 

 

Preamplifier

 

 

The low noise preamplifier circuitry is the same as the original 1985 design and, as we have highlighted above, greatly benefits from the improved, fully smoothed and regulated power supplies.

Among the discernible alterations, one that immediately catches the eye is the addition of a new „direct“ switch at the preamp stage. With this switch you can totally bypass the gain block before the volume control, resulting in roughly 10dB less gain. This feature proves particularly advantageous when working with modern or high-output digital sources, enabling fine tuning the range of your volume potentiometer and accommodating sensitive loudspeakers.

Furthermore, a notable upgrade has been made to the volume potentiometer itself, now replaced by a premium ALPS RK series potentiometer. This high-quality component ensures superior performance and enhanced precision. Additionally, the potentiometer is now motorized, granting you the convenience of adjusting the volume from the comfort of your couch, courtesy of the new included remote control.

 

 

Phono Stage

The A1 employs a discrete current-mode input stage for lowest noise amplification of MC and MM cartridges. A low noise current to voltage conversion stage is used for further amplification and RIAA equalization. Automatic input impedance matching for the selected MC input, along with increased gain increases the versatility of the A1‘s phono stage.

The return of a true Hi-Fi classic

The A1 has one secret. This secret is simple: it makes music. It sounds sweet and fluid and creates a beautiful atmosphere around natural instruments. Especially in small to mid-sized rooms, carefully set up with a pair of great two-way speakers. It is not a powerhouse, but music lovers will cherish its abilities.

It‘s also not a product that you‘ll want to hide. A perfect example of form follows function. The oversized heatsinks define the A1‘s look, but they are essential for its operation. Truly unique, from the outside and inside.

The A1 has a sweet, warm, full and exciting sound. No harshness. No grain. Just pure music. It doesn‘t get muddy, and despite its lower power, drives difficult speakers with ease. It remains clean right up to its power limit. To hear what the A1 does is to hear what Hi-Fi is supposed to do: it makes music, pure and simple.

 

 

The A1 through time - Improvements to the original

  • Updated transformer to more efficient “dual mono split rail” windings
  • High quality and updated ALPS RK series potentiometer as volume control
  • IR remote control added for volume
  • Gain block before volume control totally by passable using “direct” switch (-10dB)
  • All transistors including output devices are carefully selected modern equivalents
  • All capacitors in signal path are polypropylene (PP) type
  • Resistors are modern low noise metal film types
  • Care and attention made to not change any component specification from original but to update them to modern equivalent with long lifespan
  • Layout faithfully follows original within circuit sections on circuit board
  • Circuit sections better laid out, in particular the separate supplies and power amplifiers
  • Phono stage and preamplifier improved for less noise and hum

 

 

The A1 in Brief

  • 25W Pure Class A power @ 8 Ohm
  • Discrete symmetrical topology
  • Planar Audio transistors with 25A maximum output
  • Dynamic class A, slides (NOT switches) smoothly into Class B, allowing more current as needed
  • Therefore drives difficult speakers with no problems
  • Updated transformer to “dual mono split rail” windings
  • Fully independent left and right power supplies
  • Each power amplifier now has double supply capacity
  • Transformer noise and heat dissipation reduced
  • Filtered main supplies
  • Gain block before volume control totally bypassable using “direct” switch
  • High quality and updated ALPS RK series potentiometer
  • Low noise TL071 JFET preamplifier circuitry
  • Discrete current-mode MM/MC phono input stage
  • Low noise current to voltage converter for further amplification and RIAA equalisation
  • Automatic input impedance matching (1K nominal) for MC along with increased gain
  • Original (1985) A1 appearance and circuits with modern improvements
  • Remote control added for volume
  • Modern updated low noise components

    A1 - Specifications

    Amplifier

    • Power: 25 Watts per channel into 8 Ohms
    • Voltage: 42.5 Volts peak to peak
    • Current: 25 Amps peak to peak
    • Damping Factor: 150
    • Gain (volume max): 32dB (Direct Mode), 42dB (Normal Mode)
    • Output devices: 2 per channel
    • Signal / noise ratio: 82dB
    • Channel separation: 85dB
    • Frequency response: + 0, –1dB, 10Hz to 40 kHz
    • Line level sensitivity: 300mV rms nominal, 8V rms max
    • Line level inputs impedance: 25k Ohms
    • Tape Out impedance: 220 Ohms
    • Pre Out impedance: 100 Ohms

    Phono Preamp

    • Phono RIAA response: +/- 1dB
    • MM sensitivity: 5mV nominal
    • MM capacitance / impedance / gain: 100pF / 50k Ohms / 40dB
    • MM signal / noise ratio: 75dB
    • MC sensitivity: 450μV nominal
    • MC impedance / gain: 1k Ohm / 60dB
    • MC signal / noise ratio: 70dB

    Inputs

    • 1x phono RCA MM/MC, 5x line RCA

    Outputs

    • 1 x line level RCA fix TAPE OUT
    • 1 x line level RCA var PRE OUT
    • 1 x 4mm banana/binding posts SPEAKER OUT

    General Information

    • Dimensions (WxHxD): 440 x 68.3 x 283.3 mm
    • Main voltages: 230V/115V Internally set or 100V optional
    • Max. Consumption: 130W, 0W in standby (=Power Switch OFF)
    • Weight: 10.5kg

Shipping Notes
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  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 71542539009

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Verified Purchase
Deb J
Cuba, US
★★★★★ 4
Nice partition for my basement
Color: Beige, Size: B-102''-3 Panel
This 3-panel room divider showed up well-packaged with all the parts and even a little tool for putting it together. The instructions were easy to follow, and while one person can definitely assemble it, having two makes it quicker and less frustrating. It does exactly what I needed—gives quick, easy coverage in an open area. I'm using it in my basement to hide the furnace and water heater, and it works great for that. It looks nice overall, but I picked the beige fabric (which is really more of a tan), and the black frame makes it stand out more than I’d like. A white or lighter frame would’ve blended better. Not sure that I would use it anywhere besides the basement It’s lightweight and pretty sturdy. The wheels make it easy to move, but it does get a bit wobbly, and the panel clips need to be readjusted every time you roll it somewhere new. Still, for the price, it’s a solid buy. I’m happy with it and planning to order another one.
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Reviewed in the United States on June 21, 2025
T
TexNewMex
Grantham, US
★★★★★ 5
Fantastic
Color: Beige, Size: A-132''W-6 Panel
I am perennially in the process of rearranging, reorganizing, getting ready for yard sales, changing the functions of various rooms, moving everything out of a room to do a deep clean, etc, which means that there is always SOME part of my house, if not the entire thing, that is a disaster zone. Having someone knock on my door triggers a "duck and cover" reflex because it's so embarrassing for anyone to see that I live like this. (I *feel* like I don't, really, because I know that all the various stages are all temporary, but when there's always something temporary going on, it might as well be permanent, you know?) So THANK HEAVENS for a room divider that is not only large enough to divide my uncomfortably long den in half the long way so I can shove all the messy parts up against the back wall -- that is not only simple and attractive and neutral and (this is important) NOT BLACK because I have multiple pets and anything black in this house will be pet-hair-colored within 20 seconds -- that not only has **SIX** panels for lots of options of how I want to divide the space/s -- but is also on WHEELS. Someone out there really does love me, it's true! The panels are stable *enough* - I'm not going to lie and say that nothing is going to knock them over, because I have some balance issues, and I also have cats, and both of those circumstances has resulted in a mess on at least one occasion. But in the cats' defense, they've never dealt with a room partition that didn't hang from the ceiling before; and in my defense, I just grabbed the first thing I could reach on the way down. Not the product's fault in either case. Assembly was a little dicey as I am currently in **bilateral** (oh yes, that's fun) wrist braces, so I had to give up until I had help. But I think if you're able-bodied, you shouldn't have any difficulty. The only down side is, now that I've hidden away all the mess so I can break out the holiday decorations, you know what happens next, right?? That's right... the PERMA-MESS ZONE. Oh no. Oh well. Full item name: Room Divider 132''W Wall Divider for Room Partition (Heavy Duty Base) 6 Panel Partition Room Dividers, Freestanding Room Divider Screen Separation W/Wheel Folding Privacy Screen Panel Space Separator (six panels, beige)
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Reviewed in the United States on December 1, 2025
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Verified Purchase
E. Leon
Draper, US
★★★★★ 3
Difficult assembly, doesn’t fold well, looks good fully open
Color: Grey, Size: B-88''W-4 Panel
The instructions for this divider are very inadequate. After having to redo parts of the assembly, I have finally assembled it. The divider itself seems very nice when it is fully open, however it is not possible to fold it well as all the bars with the wheels go in various directions making it impossible to fold it neatly. And it has a large footprint. It is possible that I did not assemble it fully well because of the lack of adequate instructions. I am not even sure if I will keep it because I need to fold out of the way when nothing in use.
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Reviewed in the United States on April 16, 2026
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Verified Purchase
K.L
Bozeman, US
★★★★★ 4
Slightly challenging build
Color: Beige, Size: A-88''W-4 Panel
This was my second screen set I've purchased, first of this style. Not the easiest to assemble. Lots of pulling and tugging; not a highlight in my day.
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Reviewed in the United States on January 15, 2026
L
LBZ
Dallas, US
★★★★★ 5
Commercial grade divider suitable for many needs
Color: Beige, Size: A-132''W-6 Panel
This item will be used at a future event where we need to separate a single locker room into two large areas, without any construction. This divider is perfect for the job because the partitions can be 1 to 6 panels and it will roll into place. When the event is over, the divider will fold/roll away and the locker room will return to its original design. The unit is very heavy, which will ensure that it is sturdy and stable. All the components arrived, wrapped in plastic to prevent damage. The screen material is a woven polyester in a cream color that will occlude any visibility but it may be possible to see shadows on the opposite side. The height is about 6ft, which would require a very tall person to "peep over" the divider. I needed a quality unit for this project and the frame, screens, and mobility will meet the needs. The divider is not the same as the small decorative dividers -- it is more of a commercial grade product, yet tasteful. If you want/need a small divider as an accent piece, this is not the best choice. This item could be used in a medical office, treatment/massage room, to divide an office room into two, or block a hallway in a building.
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Reviewed in the United States on December 2, 2025

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