There are eight tubes covered by this record. This is a power pentode vacuum tube with a loctal base. This is a spare tube for Bus driver arithmetic rack, S/N 10. Four of these tubes have a single number around the tube toward the base; three have both the number near the base and another written vertically; the final tube has a circle painted in yellow ink around the top of the tube.
Date
ca. 1951
Manufacturer
Sylvania
Place Manufactured
U. S.
Identifying Numbers
Model number
6145
Printed in silver ink on top of the glass envelope.
Other number
19PDBII V1-1
Handwritten vertically in green ink on the glass envelope of the above tube.
Other number
20 FR V5-3
Handwritten vertically in green ink on the glass envelope of the above tube.
Other number
27-FR V5-5
Handwritten vertically in green ink on the glass envelope of one tube.
Other number
9RD V6-3
Handwritten vertically in green ink on the glass envelope of the above tube.
Other number
DE1084
Stamped in green ink around the glass envelope toward the bottom of one tube.
Other number
DE12060
Stamped in green ink around the glass envelope toward the bottom of one tube.
Other number
DE18256
Stamped in green ink around the glass envelope toward the bottom of one tube.
Other number
DE246
Stamped in green ink around the glass envelope toward the bottom of one tube.
Other number
DE9077
Handwritten in green ink around the glass envelope toward the bottom of one tube.
Other number
DEI 6572
Stamped in green ink around the glass envelope toward the bottom of one tube.
