Mastersound 300 B S.E. - Manual (Page 2)

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Inside
We built the 300 B S.E. integrated with the utmost care, using
only selected materials. Our product passed the stricter quality tests
with excellent results and is now ready to offer You many years of
pleasant listening.
A new amplifier needs to be put on at low volume in order to
perform at its best the musicality and high definition of sound.
After a “training” period, You will have to play Your
apparatus for at least twenty minutes before the circuits can entirely
stabilize and reach the ideal temperature for playing.
We therefore recommend that You follow our simple
instructions to get the best results in listening
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Tube installation
During the transportation the tubes are kept in an appropriate
box and then they must be placed in the correct position (see the
photo above).
The 300 B tube is indicated either by letter A or B, which
stand between the pins and are written on the base: that is the right
place for the tube to be installed.
BE CAREFUL: there is only one correct position for the tube! So
please check the right position of the four pins and do not force the
installation in any way: You could seriuosly damage the sockets