Quality
Tour of RCA's Receiving-Tube Manufacturing Facilities
Tour
page 4 of 5
19.
It is at the Sealex machine where the glass assembly and the cage are permanently
joined.
20.
Then the air inside the envelope is evacuated....and each tube is permanently
sealed.
21.
The newly-finished tubes are put through their paces by an RCA developed
tube tester that can automatically check up to 2,500 electron tubes an hour.
This device pre-heats the tubes and subjects them to many different tests to
maintain top manufacturing quality. If a defective tube shows up, it is rejected
and destroyed.
22.
In addition, to prevent fracture during tube life, tubes are tested for
top strength and for low level of glass strain.
24.
Tubes that pass then go
to the Quality Control Department, which runs further tests for glass strength
and physical defects. Tubes are vibrated on a special testing machine. If any
discrepancy appears on control charts, it is traced back to source and corrected,
thereby keeping quality high. Rejected tubes, of course, are destroyed.
