The BSR
McDonal 810 Transcription Series is available as a Total Turntable that
includes a matching custom walnut wood base, a deluxe tinted dust cover, and
rhe superb Shure M-91ED magnetic cartridge with elliptical diamond stylus. All
in one carton. All included in the price. Complete, ready to plug in and play,
with all critical adjustments precisely pre-set on BSR laboratory equipment.
The BSR 810
was designed without compromising quality, technical specifications or
performance features - regardless of the ultimate cost. Yet, the result is an
instrument offered at a price consistent with our reputation for producing
turntables that are unsurpassed values in every price range.
Features:
Sequential
Cam System
Replaces the
conventional cam gear and swinging plate used in every other automatic
turntable. This revolutionary engineering breakthrough results in a smoothness
and quietness of operation and an overall reliability never before achieved.
The utilization of eight independent pre-programmed cams eliminates the
multiplicity of light stampings and noisy moving parts required in all other
automatic turntable mechanisms.
Synchronous
Power Unit
As one of
the world's largest designers and manufactturers of subfractional horsepower
motors, BSR set its resources to develop a motor to match the performance of
the Sequential Cam System. The result is the new high torque ultra-quiet
synchronous induction power unit, which achieves an unwavering constancy of
speed indepemdent of voltage input or record load.
Transcription
Tone Arm System
The longer
the tone arm the less the tracking error. The 8,6562" pivot-to-stylus
lenght reduces tracking error to less than 0,5° per inch. The low-mass aluminum
tone arm assures extremely low resonance and is counterbalanced in both
horizontal and vertical planes.
Concentric
Gimbal Arm Mount
Gyroscopically
pivoted on four pre-loaded ball-bearing races to assure virtually no friction
in either the horizontal or vertical planes. This design gives the 810 a
tracking capability of 1/4 gram.
Viscous-Damped
Cue and Pause Control
Provides
gentle silicone oil-damped tone arm descent. In all other automatic turntables,
the anti-skate system tends to move the tone arm outwards while it descends.
BSR designed an exclusive positive friction Cue-Clutch that prevents this.
After a pause, the 810's tone arm returns to the identical groove, every time.
The cueing control can be operated in both automatic and manual modes.
Viscous-Damped
Tone Arm Descent
The same
gentle viscous controlled descent provided in the cueing operation also
functions during automatic and semi-automatic play.
BSR makes
more automatic turntables than any other manufacturer. More in fact than all
other manufacturers in the world put together. But of all the turntables we
make, the BSR McDonald 810 Transcription Series is the most unique. It is a
triumph of years of painstaking efforts and research in our Engineering
laboratories in Warley, Worcestershire, England.
Our
enigineers sey out with a single objective. To design an automatic turntable
that could effectively offer advantages in performance and features over the
finest competitive units made. We sincerely believe our 810 equals, and in many
instances exceeds, the performance of any automatic turntable presently
available.
The 810 offers an impressive group of
technical innovations for serious music lovers … for collectors of
sophisticated high fidelity equipment. Its pre-programmed sequential cam system
introduces a new experience in smoothness, quietness and featherlight operation
over the widest range of operating modes. The low mass transcription tone arm
system virtually eliminates tracking error and offers precise zero balance
adjustment over the full range of cartridge and stylus masses. These and the
other important engineering features described in this post result in complete
freedom from distortion and maximum preservation of your records.
Specifications
Wow and
Flutter (measured on Gaumont Kalee Wow and Flutter Meter type 1740 using Decca
LXT5346 record):
Waw at
33-1/3 and 45 RPM : less than ,1% rms
Flutter at
33-1/3 and 45 RPM : less than ,05% rms
Wow and
Flutter DIN weighted (measured on a ME102B Mini Flux meter manufactured by
Technisch-Physikalisches laboratorium):
Wow/Flutter
: ±0,15 peak
Rumble
: less than 55 dB relative to a 1 kHz 10
cm/sec peak recorded signal (record to DIN 455544). The weight curve having a
roll off of 12 dB per octave above and below 315 Hz
Tracking
Error: less than 0,5° per inch of redius
Arm Pivot to
Stylus Distance: 8,562"
Arm
Type: Concentric gimbal arm mount
gyroscopically pivoted on 4 pre-loaded ball-bearing races
Minimum
Tracking Force: 1/4 gram
Arm
resonance: 7 cycles
Stylus
pressure Range: 0- 4 grams
Turntable
Platter: 12" Dynamically Balanced
die-cast, weight approx. 7 pounds
Motor
Type: Dual range synchronous power unit
100-130 V AC 60 Hz easily convertible to 220 V AC 50 Hz operation
Speeds: 33-1/3 and 45 RPM
Pitch
Control: Variable ±3%
Platter
Diameter: 12"
Platter
Weight: approx. 7 lbs
Drive
Mechanism: Sequential cam system
Suspension
System: Four foam damped helically wound
coils on rubber shock mounts
Record
Sizes: 12" 10" or 7"
Record
Stack: 6 records
Muting
Switch: provided
Pop
Filter: provided
Dimensiond
(W x H x D):
810
Turntable: 15-1/8" x 4-1/2" x
12-1/8"
With base and dust cover : 17-1/8" x 9-1/4" x 15"
Weight:
Only 810
: 17 lbs
With base
and dust cover : 22 lbs
