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Musical Fidelity A1:Musical Fidelity A1
Amplifier Class:A
Number of Inputs:6
Number of Outputs:3
Audio Inputs:RCA, Phono MM/MC
Audio Outputs:RCA, Binding Posts
Musical Fidelity:Musical Fidelity
Color:Black
Connectivity:Wired
Features:Same Specs, Appearance and Circuits as 1985 v.
MPN:MUFAMPA1PRA
Manufacturer Color:Black
Number of Channels:2
Power:25 W, Temp “slide” to Class B for Higher Power
System Configuration:Stereo
Type:Stereo Integrated Amplifier
ListenUp Add to favorite sellers Feedback Menu View all items Feedback About us Contact us Musical Fidelity A1 Stereo Integrated Class A Amplifier – 2023 Release Description: Musical Fidelity A1 Integrated Amplifier – Clearance / Open Box First released back in 1985, the Musical Fidelity A1 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. A1 Integrated Amplifier Features: 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 Integrated Amplifier 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. A1 Integrated Amplifier 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. A1 Integrated Amplifier 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 About Us Turning Up The Volume Since 1972. ListenUp has been the Rocky Mountain region’s most trusted resource for high-performance home entertainment systems since 1972. We have four stores in Colorado and New Mexico to serve you, as well as a dedicated Custom Division for more elaborate systems, a renowned Commercial Division and an E-Commerce Division to handle online sales. You love the music. We help bring it home. The Warehouse Deals division was added in 2017 to bring you the best deals and bargains on open box, scratch/dent or clearance items. The department is headed by Edward Spar (above) and has already earned a sterling reputation as a trusted source of open-box items. Being a champion of ListenUp’s business practices, ListenUpWarehouseDeals will always work to give you the best solution at the best deal for your needs. The best products from the best vendors. We are proud to represent the finest manufacturers in the world, such as Audioengine, AudioQuest, Definitive Technology, Denon, Harman Kardon, Klipsch, Marantz, NAD, PSB, Polk and more. Whether you are interested in an A/V receiver, a new set of speakers or a desktop digital music system, a single component or a customized whole-house system, we have a solution to fit your exact needs. Shipping Shipped within ONE BUSINESS DAY* We want you to have your purchase as soon as possible, so we ship all orders within one business day of when the order is placed and paid for. Due to the high value of some items, your item may be shipped with a signature required upon delivery. *While this applies to most orders, it does not apply to items that are drop-shipped from different warehouses or have to be shipped via an LTL carrier. Returns 60-day Money-back Guarantee with FREE RETURN SHIPPING We want you to be absolutely satisfied with your purchase. If you’re not, you may return any product within 60 days. You can either exchange it for a different product or we’ll refund your money – it’s totally up to you. Just contact us for a return authorization number via eBay connection/ask a question, make sure the product is in like-new condition, and pack everything (including remote, owner’s manual, power cord, etc.) securely in the original packaging. We’ll even pay for the return shipping.* *Items that are specially delivered, such as some larger televisions, floorstanding speakers and furniture, are not included in this offer. If a product is defective or damaged, however, there is no charge for returning it, and there is no re-stocking fee as long as all of the original equipment is complete and returned in good condition. Credit or Exchange – 60 days You may return merchandise for credit toward a future purchase or exchange for another item any time within 30 days of purchase. You may contact us via eBay connection/ask a question. We will notify you of your credit or exchange via e-mail once we have received and processed the returned item. 60-day Price Guarantee If within 30 days of your purchase you find the same product advertised for less (from an Authorized Internet Dealer), we’ll refund the difference. Just contact us via eBay connection/ask a question. Exclusions These policies do not apply to commercial or contract sales, which are subject to the terms of the contract. These policies do not apply if an alternate policy is posted on an eCommerce listing. Installed equipment may not be returned for refund, credit or exchange, except by agreement of the Webmaster and payment of a restocking fee. You may contact us via eBay connection/ask a question. We will notify you of your refund credit or exchange, via e-mail, once we have received and processed the returned item. Warranty ListenUp’s warranty/logistical support only extends within the United States. If a unit is taken out of the United States and there is any reason to activate the warranty or return process, you would be responsible for all shipping and fees involved with moving the product outside the US. FEATURED CATEGORIES Customer Service About Us Contact Us Feedback Secure Payments Newsletter Subscription Add my Shop to your Favorites and receive my email newsletters about new items and special promotions! Join Now Β© Copyright 2021 ListenUp | All rights reserved eBay design: MH Design Lab
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