Audio Research REF750 Mono Valve Amplifier

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This item cannot be ordered online. If you are interested please click on the Ask a Question button below.

Featuring new monochromatic chassis styling derived from the REF250 and REF150, the ‘750 has a slightly wider, close-fitting anodized front panel with new silver side panels. Aluminum buttons and twin analog meters have replaced the knobs and fluorescent display of the 610T – one for output bias adjustment and monitoring power output, the second for line voltage.

This item cannot be ordered online. If you are interested please click on the Ask a Question button below.

The appearance is more refined and attractive, but is clearly a statement piece from Audio Research. A new, optional 12V fan-cooled silver top cover is available at additional cost.   Using the now-standard KT120 output tubes (8 matched pairs, driven by another matched pair) in the classic Audio Research push-pull Class AB output stage, the input stage has been streamlined, using very low noise jFETs mated to a 6H30 twin triode follower. A 6H30 driver and 6550WE regulator provide regulation of the power supply.

Meanwhile, power-supply energy storage has been increased by 30%, to 1300 joules!   A meter for tracking tube hours has been conveniently added to the back panel of the chassis, along with jacks for the optional top cover. Handles are positioned fore and aft for easier lifting and movement during installation. Because all Reference amplifiers are fully balanced from input to output, the input is XLR-only. There are 4-,8-, and 16-ohm output taps. As on other REF amps, there is a 20A IEC connector.

Sonically, the REF750 is simply the most breathtaking power amplifier ever produced by Audio Research. The sense of fluid ease, spectral coherence and unlimited dynamic range is immediately apparent – and the degree of sheer improvement over the previous 610T is enormous. If you are familiar with how much the REF250 advanced beyond the 210 in sonic virtue, you have but a glimpse of what to expect from the REF750. It is an experience you will not soon forget, and one that will plant you in your listening chair whenever the power is engaged.   The REF750 is a serious amplification system for the listener who is ultimately serious about the fidelity of music playback. These amplifiers can be described in no other way that will do them justice. They are big, they are heavy, and yes, they are expensive. But they elevate music to a new level of truthfulness and passion, connecting listener and performance.

We endeavour to despatch same day for orders placed up to 2pm on available stock items (items with stock message "Usually dispatched within 24 hours"). Please remember to check with us first for a physical stock check if next day delivery is important to you. Any items with stock message "Usually dispatched within 72 hours" are items that we do not hold in stock but order in from the importer or manufacturer as soon as a customer order is recieved. Occasionally these may be delayed beyond 72 hours due to importer/manufacturer stock levels but we will inform you as soon as we can if this is the case.

UK ORDERS:  We despatch the bulk of our UK mainland items on a 24 hour service – Free of Charge.  Non Mainland locations - Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland may take a day or so longer and are not Free of Charge. Smaller items are delivered using Royal Mail recorded delivery or special delivery. Larger items are delivered using a courier service such as Interlink Express, DPD, UPS or DHL. 

INTERNATIONAL ORDERS: We offer competitive rates which can be confirmed by email. Please just ask – we will need a full delivery address and telephone number. Smaller items are delivered using Royal Mail Small Packets Airmail with International Tracked and/or Signed depending on value of item and availability of the service. Larger International shipments are sent by insured and tracked services using DPD, DHL or UPS. If there are any delays due to specific customs regulations, etc, you will be contacted by Turntableworld or by the courier with a request for any further information required. Customs duties do not apply for shipments into any EU country (for a full list please refer to the EU Country List). Customs duties can apply for countries outside of the EU. Customers in these countries are responsible for all taxes and duties incurred when the items enter their country.

COLLECT IN STORE OR HOME INSTALL:At the request of the manufacturer some items cannot be supplied by mail order but you can click and buy them and then elect to collect them from our store or arrange a home install (if applicable). Applicable items clearly state that they are Collect in store or home install. Once ordered you will receive a message prompting you to contact us by phone or email to arrange for us to deliver and install or to reserve and collect from our store at your convenience, you will also be advised of the delivery time / stock availability as not all Home install / collect in store items are held in stock. 

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