PANASONIC TX-29AS10C CHASSIS EURO 4H CRT TUBE PANASONIC A68ELO10X71

The Quintrix CRTs:
Panasonic reintroduced its Quintrix picture tube technology, first launched in the Seventies, in Europe in 1996. The technology was initially used in 25 and 32in. CRTs. in 1997 year there were plans to adopt it for a much wider range, from 21in. to a mighty 36in. widescreen tube (Quintrix Wide). Quintrix employs a number of technical features that contribute to improved picture quality. One of these is specially treated pigmentation for the red and blue phosphors. As a result, ambient light of the same colour is reflected while ambient light of other colours is absorbed, giving a fifteen per cent contrast improvement. In addition, red and blue phosphors with EBU (European Broadcasting Union) colour points have been introduced. These were normally used only in broadcast monitors, and have a higher colour purity. Quintrix 4:3 aspect ratio tubes employ a Quadrupole In -line Gun (QIG) and a coma -free deflection yoke to give a twenty per cent increase in picture sharpness. The QIG has a redesigned first grid aperture of rectangular instead of circular shape and an extra grid to provide an additional pre -focus lens, see Fig. 1. As a result, the vertical beam size at higher currents is reduced, giving improved focusing at the edges of the screen. The coma -free deflection yoke is used to reduce an effect known as spot -coma aberration. This is caused by the basic barrel -shaped deflection field distorting the beams produced by the two side guns, so that the vertical spot size produced by the red and blue beams is greater than the size of the centre, green spot. The coma - free system uses coma -correction elements to introduce pincushion correction to the deflection field, see Fig. 2. This compensation equalises the size of the three beams, reducing red and blue blur. There is an overall 10% resolution improvement. Quintrix tubes also use new bimetal thermal compensation springs to hold the shadowmask, reducing movement by 75 per cent in comparison with a conventional CRT.


A magnetic shield fixed within the CRT is used to reduce electron beam movement caused by the Earth's magnetic field. According to Panasonic this feature reduces the beam movement by 50 per cent. Quintrix Wide (16:9 aspect ratio) tubes use an Over - Lapping Field (OLF) electron gun. With this arrangement (see Fig. 3) the diameter of the main focusing lens is increased to 7.9mm in comparison with the 4.5mm of the three separate lenses in a conventional in -line gun tube. As a result, the electron beams fill a greater screen area with sharper focusing. The 36in. Super Flat Quintrix Widescreen TV set on display was an impressive -looking beast. Its CRT has a dot pitch of 0.7mm, the same as that was used in Panasonic's 1,125 -line Hi -Vision HD -TV sets in Japan. The CRT alone weighs 55kg - the set needs four people to lift it!
Three scart connectors are provided, plus RF, composite video and phono audio sockets. The set has been launched later 1997 , but no price information was available.........