Mastersound Monoblock 300 B Plus - Manual (Page 6)

M a s t e r E m o t i o n 6
Tubes 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 .