ETC 4MP1 4" oscilloscope Cathode Ray Tube.

Dumont K1206P7 oscillosope CRT

Magnavox M1378P31 oscillosope CRT

RCA 4AP10 dark trace CRT.

This tube was used in projection radar during WW2. Where the beam writes on the face it absorbs light. A high intensity light was focused on the face and projected through a lens to a large screen producing a black on white radar display.


Oblique View	Electron Gun and Deflection Plates

905 Oscilloscope tube
Selling price in 1948 $45.00
circa late 1930's

Early Dumont EX4024P1
5" CRT from oscillograph demonstration unit.
Had power supply only in an open frame wood box for use in classrooms.

5FP25 5" diameter CRT
This was a very popular magnetic deflection tube from the 40's through the 60's.
It was available in almost all phosphers including P7 (WW2 Radar Screen) and P4 B/W screen.
The P4 version was used in the B&K TV Analysist Flying Spot Scanner and as a test tube for TV repairmen.
Selling price in 1948 $38.00 for P4 phosphor.