10
Nagra –
VPA
Operation
The main selector
Turn the Mains switch (on the rear) to the
I
position. Then, place the
main selector on the “
MUTE
” position, the tubes are now powered and
will light up. In this position the amplifier is powered and the audio
signal is muted. Turn the main selector to the ”
ON
” position, the
amplifier is now fully operational. The best performance will be
obtained after 15 minutes operation (warming-up time).
Mains switch
(rear)
Main selector
position
What is happening
O
Any
The unit is completely off
I
OFF
The unit is in standby
I
MUTE
The unit is On, sound is muted
I
ON
On
To prevent tube ageing, it is better leave the amplifier on for longer
periods rather than turning it on and off several times a day. For more
information on tube ageing and replacement, refer to Tube ageing and
replacement on page 12.
Main selector
Modulometer
Rear tube selector
(for bias)