Artifact Details Title Vacuum tube type 3E29 Catalog Number 102732118 Type Physical object Description This is a double beam-power tube with a 1 + 6 pin septar base and two pins for the plate extending out the top of the envelope. One pin is larger than the others to provide the pin-one orientation. This is a spare tube for Register Driver S/N 6. Manufacturer RCA Place Manufactured U. S. Identifying Numbers Model number 3E29 Printed in white ink around glass envelope. Dimensions overall: 2 1/8 in x 1/4 in x 1/4 in Category Component/vacuum tube Related Records 102630997 Whirlwind register driver