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0020 13 Feb

Pursuing 533. Found .5V noise on -35V sense and [?], core 3;
other boxes had .25V noise. Moved to other (unused) half of 772
power supply; noise down to .25V. (All noise is 60~.) Now running
3.15 with 3 40K BLTSTS and 15V on HD sense AMDS, core 3.

Saunders [&?] Poole.

0030. Crash. xSEL 124. Restarted, normal voltage. So much for that straw!

0040. BLTST again.

0048 Crash. xSEL 136 PC 14543 Restarted

Several (~5) attacks by 533 bug.
System died after last one.
Old system up at 0120.

D.M.P.

0720 Mag tape lossage 13-Feb-68
Cause not obvious. Vacuum lost from
tape collums.

J. Sauter

Vacuum Motor has a charred armature. A
replacement is being sought.

J. Gleason