5BP4 (1802-P4)

This CRT was used in many of the prewar 5" televisions, RCA TT-5 & TRK-5, Meissner 10-1153, GE HM171 & HM185. Electrostatic deflection; electrostatic focus. It is a very poor performing tube, even a NOS tube will have a very dim display.

9AP4 (1804-P4)

This CRT was used in the prewar RCA TRK-9/90.
Magnetic deflection; electrostatic focus.

 This particular CRT came from the RCA archives in Camden. The label carries numerous identification numbers. The L-2041 may have referenced an inventory or project, C-730P is probably the sequential number that was given to developmental CRT's by RCA, 1804-P4 is the commercial designation. Then the date which appears to be Jan  11,1939, the initials I have no idea, last is "South Vault" possibly where the tube was stored.
The bad news is that the tube is no longer under vacuum.

12AP4 (1803-P4)

This CRT was used in RCA TRK-12, Andrea 2F12, and virtually all prewar 12" mirror in lid televisions.
Magnetic deflection; electrostatic focus.

This is the 12AP4 in its protective cardboard cover, the tube was shipped this way. When it was installed in the television the front cover was removed and the cone section was kept with the tube, notice the cutout for the HV lead.

3KP4

This CRT is used in the Pilot TV-37, the first set sold for under $100.
Electrostatic deflection; electrostatic focus.

3NP4 (MW6-2)

Projection CRT used in Protelgram projection units. The Protelgram was used by many manufacturers, Emerson, Decca, Scott. The face of the CRT is spherical to match the curvature of the mirror that was used in the Protelgram. A version of this tube with a flat face (MW6-4) was also produced that was used with a direct lens projection system.
Magnetic deflection; magnetic focus.

5TP4

Projection CRT used in all RCA projection sets and most other projection televisions from 1946 - 1949. Anode voltage 25KV.
Magnetic deflection; electrostatic focus.

5AZP4

Second generation projection CRT, replaced the 5TP4 in projection sets through the mid 50's. Due to the 40KV anode voltage this tube used, the high voltage lead was molded on to the tube.
Magnetic deflection; electrostatic focus.

7DP4

This CRT was primarily used in the RCA 621 set.
Magnetic deflection; magnetic focus.

7EP4

This CRT is used in early 7" sets, in particular the Transvision kits.
Electrostatic deflection; electrostatic focus.

7JP4

This CRT is used in virtually all 7" sets from 1948 until the early 50's.
Electrostatic deflection; electrostatic focus.

8BP4

This CRT is electrically identical to the 7JP4 except for the screen size.
Electrostatic deflection; electrostatic focus.

10HP4

This CRT is also electrically identical to the 7JP4 except that the screen is a full 10" diameter. Raytheon built this tube for use in their console.
Electrostatic deflection; electrostatic focus.

10BP4

This CRT is the most commonly used picture tube, used in virtually every 10" set from after the war until the early 50's.
Magnetic deflection; magnetic focus.

10FP4

This CRT is the aluminized version of the 10BP4, used primarily by GE and Farnsworth as original equipment.
Magnetic deflection; magnetic focus.

12LP4

Like the 10BP4 above this is the most common 12" CRT found in late 40's and early 50's televisions.
Magnetic deflection; magnetic focus.

15AP4 (First Style)

This CRT was used in early production DuMont sets. Notice the "bump" between the neck and the main bulb, similar to the prewar 12AP4.

15AP4 (Second Style)

This CRT is used in DuMont sets. The "bump" is gone, and the form is the same as other CRT's of the era. Notice that DuMont continued to use the "button" style HV connector found on non television CRT's.