Cathode Ray Tubes
From the beginning to the end....
From the beginning to the end....
The Cathode Ray Tube site
electronic glassware
History and Physics Instruments
electronic glassware
History and Physics Instruments
Small Television CRT's
SYLVANIA 5BP4 / 1802-P4 Kinescope tube
5" CRT tube with white phosphor used in early US TV sets
like the pre-war RCA TRK-5 set (1939) and early radar displays.
P1 phosphor (green) P3 phosphor (yellow) P4 phosphor (white)
5" CRT tube with white phosphor used in early US TV sets
like the pre-war RCA TRK-5 set (1939) and early radar displays.
P1 phosphor (green) P3 phosphor (yellow) P4 phosphor (white)
HOME
PREV
Philips MW 6-2 (1953)
B&K 5BKPV-1 Very short persistence
purplish blue phosphor flying spot tube.
purplish blue phosphor flying spot tube.
The first TV pattern generators to make test
patterns for adjusting and testing TV receivers
used the flying spot principle. A CRT with a
special UV phosphor produced a blank full field
picture using a frame and field oscillator.
A transparent picture of the test pattern was
placed in front of the CRT, then the image light
fell on an sensitive image multiplier tube which
was connected to a circuit which produced the
RF video signal .
Click at the picture to see the working tube in an
old B&K TV pattern generator. It is the same
principle as the flying spot scanner invented by
Manfred von Ardenne in 1930. Von Ardenne's
work was a great contribution in the development
of our modern TV.
patterns for adjusting and testing TV receivers
used the flying spot principle. A CRT with a
special UV phosphor produced a blank full field
picture using a frame and field oscillator.
A transparent picture of the test pattern was
placed in front of the CRT, then the image light
fell on an sensitive image multiplier tube which
was connected to a circuit which produced the
RF video signal .
Click at the picture to see the working tube in an
old B&K TV pattern generator. It is the same
principle as the flying spot scanner invented by
Manfred von Ardenne in 1930. Von Ardenne's
work was a great contribution in the development
of our modern TV.
The MW6-2 was part of the Smitt optical box in a vintage Philips projection TV, TX 701. There is a nice article about this tube at the The National Valve Museum .
Hokuto E2282 10cm TV tube
Used in small portable TV equipment.
Used in small portable TV equipment.
SMALL TV CRT'S
Hitachi 40LB4
24x28mm Viewfinder tube
24x28mm Viewfinder tube
Matsushita 30FB4
22x18mm viewfinder tube
22x18mm viewfinder tube
NEC 5K28
16mm viewfinder tube
16mm viewfinder tube
Citizen H9730241
My smallest 9x12mm! viewfinder tube
My smallest 9x12mm! viewfinder tube
MINIATURE CRT'S
SPECIAL TV CRT'S
8YP4 8" 110 degree CRT
Together with 8XP4 and 5AXP4 this tube from around the 1950's was used in TV repair shops as a test tube.
Was original sold in a carton carrying box.
Together with 8XP4 and 5AXP4 this tube from around the 1950's was used in TV repair shops as a test tube.
Was original sold in a carton carrying box.
Commercial TV started in the US at the end of
the thirties, the first commercial high vacuum
produced "long life" CRT's were used in TV sets.
The tube on the right was used in the RCA model
TRK-5 in 1939. Today only a few of these TV
receivers exists worldwide.
More info about this TRK-5 model can be found on
the ETF website.
the thirties, the first commercial high vacuum
produced "long life" CRT's were used in TV sets.
The tube on the right was used in the RCA model
TRK-5 in 1939. Today only a few of these TV
receivers exists worldwide.
More info about this TRK-5 model can be found on
the ETF website.
The hollow face
The "blue front" which has all colors of the rainbow.
Philips laboratory HDTV projection CRT
This Philips (prototype?) model of a HDTV projector
CRT is the green type of the three tubes used.
(green , red , blue) The face has a strange color
scheme which changes with the incoming light.
It has no type, but a test date 15-3-91.
The face of the tube is hollow and has no fluid like
similar projection tubes. Origin NAT Lab Philips.
This tube is kindly donated by Frank Nijs.
CRT is the green type of the three tubes used.
(green , red , blue) The face has a strange color
scheme which changes with the incoming light.
It has no type, but a test date 15-3-91.
The face of the tube is hollow and has no fluid like
similar projection tubes. Origin NAT Lab Philips.
This tube is kindly donated by Frank Nijs.
HDTV CRT
