Acoustic Research AR77 XB 

The Acoustic Research AR77-XB is a highly regarded 2-speed belt-drive turntable known for its simplicity, accuracy, and reliability, embodying the high-fidelity standards set by Acoustic Research. It was introduced around 1981 and remains a benchmark for performance even compared to more expensive models.

Technical Overview

Drive and Motor:

• The AR77-XB uses a permanent-magnet synchronous motor.

• It employs a ground, endless belt drive system, which contributes to its low noise and stable speed.

Speeds:

• Supports two speeds: 33 and 45 rpm.

• Wow and flutter rating is very low at 0.03%, indicating excellent speed stability.

• Rumble is rated at 65 dB, reflecting low background noise during playback.

Tonearm:

• Features an integral, low-mass tonearm balanced in all planes.

• Tonearm length is 279.4 mm with an effective length of 228.6 mm.

• The tonearm includes a removable low-mass cartridge shell.

• It is completely isolated from the platter assembly via a damped 3-point suspension system, enhancing vibration isolation and playback accuracy.

Cueing System:

• The only automatic feature is a viscous damped cueing system, allowing smooth and controlled lowering of the tonearm.

Construction and Design:

• The turntable weighs approximately 5.89 kg (about 13 lbs).

• It is supplied with a base and a hinged dust cover.

• The design philosophy emphasizes simplicity and durability, avoiding unnecessary gimmicks to ensure low maintenance and long life.

Additional Notes:

• The AR77-XB is fully manual, appealing to audiophiles who prefer straightforward, reliable operation.

• It was often paired with the Shure M91 ED cartridge, which was optional.

• Its design principles and performance have remained industry standards for over 15 years since its introduction, praised for delivering accuracy and sound quality that surpass many higher-priced turntables