The F2a11 Integrated can be employed as a stereophonic power amplifier (in
combination with a line or full function preamplifier) in which case the volume
controls of the amplifier serve as input attenuators to match the gain of the line
device with the efficiency of the loudspeaker. In order to setup the F2a11 Integrated
as a stereophonic power amplifier power off all components of the system and
procced as follows.
Do not connect the amplifier to the mains until steps 1 to 7 have been taken.
1. Bring the power switch on the power inlet module to the OFF position.
2. Install the tubes carefully. Ascertain that the guide pins of the tube bases are
aligned with the notches of the sockets.
Never power on the amplifier until ALL tubes have been installed!
Never pull out a tube while the amplifier is powered on!
Never pull out a tube of the socket as long as it is still hot!
Always de-install the tubes and wrap them in their original protection case before
shipping or transporting the amplifier!
3. Set both volume controls to a very low angle of rotation.
4. Bring the amplifier into its final position. Make sure that there is sufficient
clearance around the tubes to allow for adequate ventilation.
5. Connect the amplifier to the loudspeakers. Ascertain that the load matching
installed on the OPT suits the loudspeaker impedance. Take notice of the
explanations presented in the section LOUDSPEAKER LOAD MATCHING of this
manual.
6. Choose an arbitrary unassigned input of the F2a11 Amplifier, in the following
denoted by STER for the sake of convenient explanation. Activate STER with the
input selector. Connect STER with with the (line or full function) preamplifier.
7. Turn the volume control on the preamplifier to about the middle position.
8. Connect the F2a11 amplifier to the mains (while leaving the unit powered off).
9. Power on the preamplifier and the program sources (while the F2a11 Integrated
remains powered off). Wait until the warm-up process on all these components has
come to an end. Switch the desired program source active on the preamplifier.
10. Power on the F2a11 Amplifier.
11. Wait until the warm-up process on the unit has come to an end.
Always switch on the preamplifier and the program sources first and then switch on the
F2a11 amplifier, observing a delay of at least 30 seconds!
Never switch the preamplifier or a program source on or off while the F2a11 Amplifier is
powered on!
12. Listen to music with the various program sources. Adjust the L+R volume control
knob on the F2a11 Amplifier for convenient loudness in average (while the volume
control on the preamplifier rests in about the middle position) and correct channel
balance. After this adjustment the attenuated gain of the F2a11 amplifier matches
