MUSICAL FIDELITY A1 updated-1985 PURE-Class-A Integrated Amp AUTHORIZED-DEALER

Description: WE ARE AN AUTHORIZED MUSICAL FIDELITY DEALER!IN BLACK - 115VA1 | INTEGRATED AMPLIFIERThe A1 is a true Hi-Fi classic.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 TalkThe 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 SupplyThe 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.PreamplifierThe 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 StageThe 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 classicThe 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 originalUpdated transformer to more efficient “dual mono split rail” windingsHigh quality and updated ALPS RK series potentiometer as volume controlIR remote control added for volumeGain block before volume control totally by passable using “direct” switch (-10dB)All transistors including output devices are carefully selected modern equivalentsAll capacitors in signal path are polypropylene (PP) typeResistors are modern low noise metal film typesCare and attention made to not change any component specification from original but to update them to modern equivalent with long lifespanLayout faithfully follows original within circuit sections on circuit boardCircuit sections better laid out, in particular the separate supplies and power amplifiersPhono stage and preamplifier improved for less noise and humThe A1 in Brief25W Pure Class A power @ 8 OhmDiscrete symmetrical topologyPlanar Audio transistors with 25A maximum outputDynamic class A, slides (NOT switches) smoothly into Class B, allowing more current as neededTherefore drives difficult speakers with no problemsUpdated transformer to “dual mono split rail” windingsFully independent left and right power suppliesEach power amplifier now has double supply capacityTransformer noise and heat dissipation reducedFiltered main suppliesGain block before volume control totally bypassable using “direct” switchHigh quality and updated ALPS RK series potentiometerLow noise TL071 JFET preamplifier circuitryDiscrete current-mode MM/MC phono input stageLow noise current to voltage converter for further amplification and RIAA equalizationAutomatic input impedance matching (1K nominal) for MC along with increased gainOriginal (1985) A1 appearance and circuits with modern improvementsRemote control added for volumeModern updated low noise componentsA1 - SpecificationsAmplifierPower: 25 Watts per channel into 8 OhmsVoltage: 42.5 Volts peak to peakCurrent: 25 Amps peak to peakDamping Factor: 150Gain (volume max): 32dB (Direct Mode), 42dB (Normal Mode)Output devices: 2 per channelSignal / noise ratio: 82dBChannel separation: 85dBFrequency response: + 0, –1dB, 10Hz to 40 kHzLine level sensitivity: 300mV rms nominal, 8V rms maxLine level inputs impedance: 25k OhmsTape Out impedance: 220 OhmsPre Out impedance: 100 OhmsPhono PreampPhono RIAA response: +/- 1dBMM sensitivity: 5mV nominalMM capacitance / impedance / gain: 100pF / 50k Ohms / 40dBMM signal / noise ratio: 75dBMC sensitivity: 450μV nominalMC impedance / gain: 1k Ohm / 60dBMC signal / noise ratio: 70dBInputs1x phono RCA MM/MC, 5x line RCAOutputs1 x line level RCA fix TAPE OUT1 x line level RCA var PRE OUT1 x 4mm banana/binding posts SPEAKER OUTGeneral InformationDimensions (WxHxD): 440 x 68.3 x 283.3 mmMain voltages: 230V/115V Internally set or 100V optionalMax. Consumption: 130W, 0W in standby (=Power Switch OFF)Weight: 10.5kgHi-Fi Heaven1549 Sixth StGreen Bay, WI 54304Contact us with your exact shipping address for accurate shipping cost.Larger speakers and items over 150lbs are strapped to a pallet and shipped via Freight including liftgate and residential delivery.We accept Pay-Pal or credit cards by contacting our store.We offer a 4% discount with payment by Zelle or check.Defective items are exchanged within 14 days from delivery.After 14 days, the manufacturer's warranty will apply. Contact us for any assistance in obtaining warranty assistance.Defective item returns must be in the manufacturer's original packaging, in like-new condition, including all packaging materials, shipped as-received and fully insured.Items are guaranteed to be as described.If a refund is desired, we will refund your full purchase price minus a 20% restocking fee.The item must be as received & unopened. Buyer pays return shipping costs.If you are having a problem, Please call before making a return claim on eBay.We do not offer free auditions or trials of merchandise.Returns will only be accepted for items that are truly defective.We use methods to detect product tampering.We will seek legal action against any individual or entity attempting to defraud us.Hi-Fi Heaven1549 Sixth StGreen Bay, WI 54304

Price: 1699 USD

Location: Green Bay, Wisconsin

End Time: 2024-08-06T20:37:16.000Z

Shipping Cost: 0 USD