SBE SB2-LA - Page 18

hours without deterioration. Should replacement be indicated by loss in out-
put or low plate current (usually both), it is recommended that a complete
new set be installed.
IMPORTANT
THE (6JE6) TUBES USED IN THE SB2-LA ARE FACTORY BAL-
ANCED. WHEN REPLACING, BALANCED TUBES MAY BE OB-
TAINED THROUGH YOUR SBE DEALER OR CHECK STOCK TUBES
FOR BALANCED MU.
It will be found that standby current will run rather high for the first hour or
so
of
operation
and
this
will
gradually
fall
to
the
correct
level.
If
necessary,
the bias should be adjusted as required until the new tubes age a Lit.
A slight blue glow within the tube does not necessarily indicate a defective iube.
However, if plate current is radically high or low, suspect a defective tube.
This is usually indicated by excessive blue glow, color on the plate or the tube
envelope abnormally cool. .
NOTE: In the event of any component failure, fuse F2 should always be checked
to see that it is intact. The unit will transmit properly if the fuse is open, but ~
undue stress will be placed on the power supply components which will reduce
their life. F2 should not fail except under a prolonged B supply short circuit.