The
Professional Archive Turntable is able to transcribe almost any
disc ever produced, with accurate and meaningful fidelity, in
a precise and repeatable fashion. It has been crafted with longevity
as a major goal and will thus perform reliably and consistently
- representing a sound investment for any organisation or individual
with a large disc archive. Incorporating a comprehensive motor
drive control system, this professional working tool was specifically
developed to deal with transcription requirements out with the
remit of domestic record playing apparatus.
The
motor, a powerful d.c. device, together with its' optical encoder,
is housed in a substantial stainless steel enclosure held remotely
from the turntable platform. Controlled by an intelligent servo
feedback system, the motor enables precise and responsive motion
control for exacting transcription work. The motor drive system
delivers speeds of 10-120 rpm, driving the platter via two compliant
belts. Motor speed is controlled by a digital electronic power
supply and is independent of variations in load. Speeds may be
set manually via thumb wheel selection, or via p.c. & RS232
serial port. Speed may be selected to one decimal place of rpm,
both directions of rotation are available, and the various motor
control parameters may be calibrated via the computer interface
incorporated.
The module, or turntable chassis, is a massive stainless steel
disc into which the turntable bearing is built, and onto which
the armboard is affixed. The motor unit and its drive system are
excluded from the actual turntable platform.
The
record spindle is detachable, permitting use of custom-built spindles
for specific 'outsize' tasks or enabling precise positioning of
any disc. Platter mass is greater than 11 kg. and distributed
to maximise inertia. Surface plates - for fully supporting master
lacquers, or archive discs of up to 20" in diameter - may
also be supplied upon request, together with disc clamping record
spindles and associated hardware.
The
turntable is supplied with a base of 30mm thickness Italian slate
which supports the turntable above and provides a rigid, high
mass reference to 'earth'. The interchangeable armboard is laser-cut
from a composite multi-layer material. Typically configured to
mount one 12" S7 tonearm, a dual armboard for simultaneously
mounting and operating 2 tonearms may also be supplied.
A
short supporting stand, with levelling facility, is incorporated
with the turntable. The motor drive system electronics is housed
within this supporting stand and the motor unit itself is affixed
to the base of the stand - holding it remotely from the actual
turntable.
| TURNTABLE
SPECIFICATIONS |
| Speed
Range |
10,0
- 120,0 rpm |
| Disc
Capacity |
0
- 508 mm |
Platter
diameter
|
300
mm |
| IPlayer
mass |
11.7
kg |
|
Module (chassis) mass |
9.57
kg |
| Dimensions
(footprint) |
580
x 358 x 360 mm |
|
| TURNTABLE
TECHNICAL DATA |
| Drive |
dual
(compliant) belt drive |
| Motor |
Airpax dc - ironless rotor |
Encoder
|
Hewlett
Packard - optical |
| Servo |
'soft' servo control via motor shaft, not turntable
platter |
| Controls:
off/on |
computer/manual
control; forward/reverse; stall/run |
| Speed
set |
10,0
- 120,0 rpm inclusive - settable to one decimal place. |
|
PC Interface |
RS232C
Serial port (9 pin D socket input). |
|
The
12"tonearm is a unipivot device, configured to permit free
movement in both the lateral and vertical planes whilst preventing
any rocking movement, the 12" S7 tonearm was rationally designed
for professional use. Stripped of all excess baggage, the tonearm
is simple, obvious and dependable; it will perform reliably and
consistently ad infinitum, generating accurate retrieval of information
from the disc, neither adding nor subtracting from the original
- which is, after all is said and done, exactly what a tonearm
should do.
The internal tonearm wiring uses high quality 'silver-over-copper'
stranded cable with a Teflon dielectric. Connector assemblies
may be supplied for unbalanced or balanced interconnects.
The headshell is a fully detachable item, offering
adjustment to both overhang and azimuth, and locks firmly to the
tonearm beam using the cartridge mounting screws. A cueing device
is aligned close to the tonearm pivot: this is a damped piston
assembly system which permits safe cueing of the tonearm over
a wide arc. Anti-skating is provided for by a fully adjustable
thread/wheel/weight assembly, supplied with a number of bias weights
to enable calibration with any cartridge.
Vertical tracking angle may be readily adjusted
by a thumb wheel situated below the main pivot assembly, each
full revolution of the thumbhole corresponding to a 1mm incremental
change in the vertical tracking angle. The tonearm geometry is
compatible with the SME mounting system and satisfies the same
geometric data as the SME 3012R tonearm. High fidelity applications
are perhaps better served by the shorter 9" version of the
S7 tonearm. Apart from overall length and effective mass the two
arms are, in effect, identical and share a common sonic signature.
The 9" arm may be supplied in preference to the 12"
version if requested, or as an addition - with a separate or combination
armboard. The 9" arm can transcribe discs up to a maximum
14" diameter.
Specific
archive applications are catered for by the option of a reversed-geometry
tonearm to enable accurate tracking of large counter-clockwise
archive discs. Custom counterweights, bias weights, headshells,
record spindles, etc. may be specially fabricated for compatibility
with unusually high mass cartridges or other atypical hardware
/ software. Please contact us directly with your specific requirements.
| TONEARM
SPECIFICATIONS |
| Distance:
pivot to stylus tip |
308.8
mm |
| Distance:
pivot to turntable centre |
295.6
mm |
Cartridge
offset angle
|
17.63
deg. |
| Overhang |
13.20
mm |
| Inner
null radius |
66.00
mm |
| Outer
null radius |
120.9
mm |
| Maximum
disc size capacity |
508.0
mm |
|
The
English has been retained from the original English web site.