Appendix 2
–
Turntable ground-wire
Some turntables
have a thin “ground” w
ire alongside the phono cables. This
wire normally connects to the metal components of the tonearm and to the
plate which carries the main turntable bearing.
A ground connection to these components is advantageous for a whole range
of reasons. Not only does it help with electrostatic screening from interfering
AC radiation, it also helps control static electricity build-up on the plastic disc
as it plays. If this wire is not earthed (grounded), the record-deck signal will
often be
noisy and “buzzy”.
Here is how to connect the turntable earth (ground) wire - if present. The best
choice depends on the complexity and choice of the related equipment.
If the installation includes a preamplifier (or integrated amplifier) for
monitoring/ listening as illustrated in Chapter 4 and 5, there may well be a
suitable connection for the ground wire on the pre/amplifier itself, perhaps
even a dedicated earth (ground) terminal. Use this.
If the computer is stand-alone, the turntable ground wire may be
connected to the 0V reference of the
Groove Sleuth MICRO
. This is NOT an
earth connection but it will tie the turntable ground to signal ground. A
dedicated cable “tail” is provided
as part of the power-supply connector to the
preamplifier as illustrated above. This connects directly to the 0V signal
reference point. The 0V reference cable is held to the main cable by heat-shrink
sleeving. If you need to use this connection, ease the “tail” from the sleeving
and connect this to the turntable ground wire.
Appendix 3 - Declaration of Conformity
The Manufacturer of the Products covered by this Declaration is
Phædrus Audio
Maidstone
Kent
UK
The directives covered by this declaration are:
2014/30/EU Electromagnetic Compatibility directive
2014/35/EU Low Voltage Equipment directive
The products covered by this declaration are:
Groove Sleuth MICRO non-equalising phono preamplifier
The basis on which conformity is being declared: The manufacturer hereby declares that the products identified above comply with the
protection requirements of the EMC directive and with the principal elements of the safety objectives of the Low Voltage Equipment
directive, and that the following standards have been applied:
IEC INTERNATIONAL STANDARD 60065: 2005. - Audio, video and similar electronic apparatus
–
Safety requirements
The technical documentation required to demonstrate that the products meet the requirements of the Low Voltage Equipment directive
has been compiled and is available for inspection by the relevant enforcement authorities. The CE mark was first applied in 2020.
Signed:
Richard Brice, Technical Director Date: May 2020
