S7 Professional archive turntable
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.
The turntable and tonearm parts are precision fabricated from various
stainless steels and A1 aluminium stock. The general construction is
of a modular nature, permitting simple addition or subtraction of modules
and equipment as required. The electronic circuitry is all solid-state,
complies with industry-standard eurocard fittings and is encased in a
standard 19" rack mounting enclosure.
The turntable and tonearm units are constant-production, field-proven
items. The motor, encoder and associated drive electronics are industrially
proven components, able to work in demanding, harsh environments without
difficulty. The Professional Archive Turntable has been designed as a
professional working tool and thus to be reliable,accurate and straightforward
- making few demands upon operatives - and, requiring only minimal maintenance,
will provide a faultless performance over many years without problem.
