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Egenskaper
A1 - Overview
"It is true ‘affordable esoterica’, then – offering performance in some respects that’s hard to beat at three, four or maybe five times the price."
DAVID PRICE - STEREONET 09/2023
"It now sonically delivers everything you could expect from a modestly sized Class A amplifier: Detailed liquid smooth harmonically saturated mid-range good bass, top end that‘s extended and refined. "
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A BRITISH AUDIOPHILE 09/2023
"I love the look, I love the feel, I love the sound, I love the weight that it brings to music. This thing sounds like it‘s got some serious balls – a knockout!" "
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THE AUDIOPHILIAC 10/2023
"The creamy colorful music reproduction is of outstanding quality, extremely delicate and fine, of rarely heard detail and expressiveness. The stage is very well illuminated and layered in depth."
TOM FRANTZEN - STEREO 09/2023
"The 2023 model doggedly sticks to the original design brief and still supplies a smooth, warm and detailed sound, exactly what you’d expect from a good Class A amp."
MARC SPARROW - FORBES 08/2023
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.
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.
he 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
Specifikationer
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, 8Vrms 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
• 1 x Phono RCA MM/MC
• 5 x 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:
• Max. Consumption: 130W, 0W in standby (=Power Switch OFF)
• Dimensions (BxHxD): 440x68x283mm
• Weight: 10,5 kg