Abbingdon Music Research PH-77 Reference Class - Manual (Page 4)

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On placement
The PH-77 may become warm during normal operation. Given this, it is imperative
that the PH-77 when installed, its location or position DOES NOT interfere with its
proper ventilation.
For example, it should not be situated on a bed, sofa, rug or similar surface that
may block the top or bottom ventilation openings; or placed in a built-in installation,
such as a bookcase or cabinet, that may impede the flow of air through its top and
bottom ventilation openings.
Do not place the component in a location near heat sources, or in a place subject
to direct sunlight, excessive dust, or mechanical shock. Do not place the compo-
nent in an inclined position.
Precautions
This equipment has been tested and found to comply with the limits set out in the
EMC Directive using a connection cable shorter than 3 metres.
On power sources
The mains power cable should be routed so that it is not likely to be walked on or
pinched, especially near the plug or back panel receptacle. The component should
not be disconnected from the AC power source as long as it is connected to the wall
outlet, even if the component itself has been turned off.
If this component is not going to be used for a long time, be sure to disconnect the
component from the wall outlet. To disconnect the AC power cable, grasp the plug
itself; never pull the cable.
It is designed to be operated in a horizontal position only. Do not place heavy
objects on the component.
Keep the component away from equipment with strong magnets, such as micro-
wave ovens or large loudspeakers.
To prevent fire or shock hazard, do not place vessels filled with liquids, such as
vases, on the component.
Touch-Sensitive Buttons
On the front fascia of this AMR component are touch-sensitive buttons. Due to the
wide variance of climes around the world, instances may arise where to activate
a button:
- the touching finger may be required to be in contact with both the button and the
front fascia to register;
- the touching finger may have to touch the chassis to discharge any static
electricity prior to button selection.
Running-In
AMR estimates that the PH-77 may take between 300-500 operating hours for all
of the internal components to be fully-broken in. Please anticipate the sonic per-
formance of the PH-77 to settle only after it has been used for this approximate
length of time.
Stand-By
Please note that the solid state section needs to find its equilibrium and due to the
(unavoidable) use of electrolytic capacitors (and an effect called soakage) around
24-48 hours of “standby” (or operation) are required to stabilise performance.
Therefore, “standby”does not shut down the solid-state sections, only the valves.