8
To restore proper operating
conditions, examine each point above
and correct if necessary. If the
condition persists, please return the
PL–L and the ACPS to an authorized
Nagra service agency.
ACPS and the red LED.
Vacuum Tube Identification and Location
Each vacuum tube used in the PL–L
has been burned–in for 12 hours,
thoroug hly tested with each tube
being subjected to 400 measurements
before final selection at the Nagra
factory to ensure the highest level of
performance. Two types of vacuum
tubes are used:
o
12 AT 7 / ECC 81
o
12 AX 7 / ECC 83
Many variants of these vacuum tube
types are available and may function
in the PL–L. However, proper
selection and use of vacuum tubes
other than those supplied by Nagra is
at the owner’s responsibility. If the
PL–L is damaged due to the use of
non–factory selected vacuum tubes,
the warranty will be rendered null and
void.
The PL–L is shipped from the factory
with vacuum tubes installed in their
proper locations. Since the unit may
have been subject to unexpected
shock in transit, it is prudent to check
that each vacuum tube is seated
properly in its socket before operation,
using a cotton glove.
