Lambda Electronics 71 Instruction Manual - page 13
III. MAINTENANCE
SAFETY NOTICE
DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT.
OBSERVE THE USUAL SAFETY PRECAUTIONS WHEN OPERATING OR
SERVICING THE EQUIPMENT TO AVOID SHOCK OR INJURY.
1. GENERAL.
Under normal conditions no special maintenance
of the Model 71 regulated power supply is required except
for occasional tube replacement. In the event of failure,
or inability of the regulated DC output circuits to function
properly a list of typical symptoms and their probable causes
is given in paragraph "6" of this section.
2. REMOVAL OF POWER SUPPLY UNIT FROM CABINET.
If tube replacement or servicing of the unit is
necessitated, the power susply unit must be removed from
its cabinet. This is accomplished by removing the four
large diameter nickel-plated screws on the rear face of
the cabinet and sliding the unit out.
NOTE: It is not necessary to loosen any screws
other than the four mentioned above for removal of the
supply from the cabinet. At no time should removal of
the painted screws in the rear of the cabinet be attempted.
3. SERVICING OF POWER SUPPLY WHEN REMOVED FROM CABINET.
a) Upon removal of the cabinet, all tubes are made
accessible, and tube replacement is simply accomplished.
6W6-GT tubes and the 6N030 tube are secured to their
sockets by means of spring~type retainer clamps. These
retaining clamps must be depressed into and held in a
flattened position before removing these tubes. when
replacing the miniature type tubes, they should be inserted
into a pin straightener before putting them into the sockets
to avoid bending pins. Bent pins create strain on the glass
bases with the resulting possibility of breakage or cracking
in time. When tubes are replaced, adjustment of calibrating
potentiometers should be checked.
11.