[old_tv_nut]

Sylvania spec sheet says

MECHANICAL DATA
.................................................. ....21FJP22...........21CYP22A
.................................................. ....21FKP22..........21FBP22
Minimum Useful Screen Dimensions
(Maximum Assured)..........................19 ¼x15 ½........19 ¼ x 15 ½ Inches
Minimum Useful Screen Area..............261.................261 Sq. Inches
Overall Length...............................25 9/32 ± 3/8..25 1/32 ± 3/8 Inches
Diameter.......................................... 21 Max............20 13/16 ± 1/8 Inches
Anode Terminal (Recessed Small
Cavity)........................................... ..Jl-21................Jl-21
Base (Small Shell Neodiheptal 12-Pin)..B12-131...........B12-131
Basing............................................ .14AU.................14AU for 21FBP22
.................................................. .............................14AL for 21CYP22A
Operation Position.............................Tube Axis Horizontal
(Base Pin 12 and V Grooved Panel Pad on Top)
Weight (Approx.)...............................43........ .............36 ½ Pounds