.
Hold onto the upper portion of the tube towards its tip. Lower the tube onto the socket, making sure that the
pins from the tube matches the holes in the socket. There are either two pins on the tube which are spaced at a
wider distance from each other than the rest of the pins (9 pin miniature tubes), or there is a locating keyway in
the middle of the tube (8 pin octal tubes). Make sure that these locators go into the side of the socket which
matches. Press the tube firmly into its socket, using a gentle force and a slight “rocking” motion. When the
tube is properly and completely inserted into the socket it should be firmly implanted and does not give in to
any movement at all when you try to rock it.
5. After the output tubes are firmly located in their sockets, restore the left and right top covers back onto
the cage. Fit the original screws onto cover and use the #2 Phillips screw driver to tighten the screws.
Do not overtighten and make sure the screws are in securely.
Notes for the servicing technician:
MB-450 Series III Signature Monoblock Owner’s Manual
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