When I moved from England to New Zealand I brought my Sony Trinatron TV with me and had the tuner replaced so it would work over here (we still have VHF TV and a different sound sub-carrier). The set worked fine after the conversion and I noticed no problems at all with the picture but that's not to say that the REALLY good TV guy had not sorted things out.
Steve On 26 April 2010 03:51, Henk <[email protected]> wrote: > Hi, > > Up to the Philips 20AX tubes they used adjustable multipole units around the > neck of the tube. These multipoles can be readjusted if needed. From the > 30AX design on, the used multipoles that were internal, thus inside the > neck. The required correction was measured during manufacture and the > internal multipole magnetized. Turning the tube upside down will help down > under if the tube was manufactured in the northern hemisphere. Then tune the > deflection yoke back or swap line and frame connections. > > Henk > > > Op 18 apr 2010, om 04:09 heeft Max Robinson het volgende geschreven: > >> I haven't been following this thread but here are my comments based on the >> attached messages. You may have difficulty finding a service technician who >> knows how to adjust purity and convergence on a CRT. In about 1975 they >> started coming from the factory with deflection yokes installed and all >> purity and convergence adjusted. >> >> Regards. >> >> Max. K 4 O D S. >> >> Email: [email protected] >> >> Transistor site http://www.funwithtransistors.net >> Vacuum tube site: http://www.funwithtubes.net >> Music site: http://www.maxsmusicplace.com >> >> To subscribe to the fun with transistors group send an email to. >> [email protected] >> >> To subscribe to the fun with tubes group send an email to, >> [email protected] >> >> ----- Original Message ----- From: "Arnold Tibus" <[email protected]> >> To: "Discussion of precise time and frequency measurement" >> <[email protected]> >> Sent: Saturday, April 17, 2010 7:04 AM >> Subject: Re: [time-nuts] [OT] degaussing >> >> >>> The dotpitch of Trinitron and Diamondtron tubes (Mitsubishi) >>> is at 1/100 inch (0.24 mm to 0.27 mm), which defines the distance >>> of these shadow wires. What tube width do you have? ;-) >>> The wires are very sensitive to vibrations which makes the horizontal >>> stabilizing wires necessary (in most cases 2, max. 3). These are visible >>> with a bright and uniform picture. >>> >>> All such tubes are equipped with a degaussing system >>> (electromagnetic coil in a black hose) which are normally activated >>> always when switching the monitor/ TV on. There is normally no >>> forther degaussing needed. >>> >>> One can apply stronger magnetic fields from the front side by using >>> cannibalized coils in parallel with an adequate 50/ 60 Hz system >>> stepping the field continuously down. Attention, strong dc H- fields >>> may result in sticking some wires together, which may be very >>> difficult to get it corrected! >>> >>> The small magnets on the back of the tube are necessary to >>> linearize the dynamic field of the deflecting coil and to compensate >>> other small steady magnetic distortions around the tube. >>> There are some more magnets on the neck of the tube for >>> convergence and beam forming. >>> >>> A long and distracting work to to when you had to replace the tube >>> or coils and then to adjust for white and clean colors and sharp >>> picture...%-)) >>> Older systems needed an earth field compensation in situ. >>> >>> (Don't try it when you are not experienced with it, you will turn crazy - >>> and the professional serviceman later will as well!) >>> >>> greetings, >>> Arnold >>> >>> >>> On Fri, 16 Apr 2010 21:05:31 EDT, [email protected] wrote: >>> >>>> point of trivia: >>>> >>>> can you count how many vertical wires are strung across a Trinitron >>>> monitors' shadow mask?? >>>> >>>> I used to work at Sony for a long time, we had a TV assembly line next >>>> door >>>> :) >>>> >>>> If you can see the vertical wires, you still have very good eyesight... >>>> >>>> bye, >>>> Said >>>> >>>> >>>> In a message dated 4/16/2010 04:55:35 Pacific Daylight Time, >>>> [email protected] writes: >>> >>>> Are they really? For some reason, every Trinitron I have ever seen >>>> has clusters of little stick on magnets placed here and there on the >>>> back of the glass envelope. >>> >>>> The trinitron has a shadowmask. It is a grill of highly tensioned >>>> wires >>>> that are positioned just behind the screen. The original trinitron >>>> tube >>>> was a little 5 inch diagonal CRT. It had to be small because the wires >>>> tended to vibrate if the set was bumped, and that made for some very >>>> odd >>>> displays. The later larger tubes had horizontal titanium wires welded >>>> to >>>> the backs of the shadow mask wires every 5 or 10 inches, to prevent the >>>> psychedelic color fest that happened when the CRT got bumped. >>> >>>> The trinitron has three very carefully aligned cathodes in the gun. >>>> They >>>> are positioned side-by-side, creating the slight different projection >>>> angles necessary to cause the long vertical slots formed by the shadow >>>> mask >>>> to eclipse the appropriate color bands on the screen. >>> >>>> I'm not sure what you are describing; it sure sounds cool; but it isn't >>>> a trinitron. >>> >>>> Can you find some references? I'd like to read up on it. >>> >>>> -Chuck Harris >>> >>> >>> >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Steve Rooke - ZL3TUV & G8KVD A man with one clock knows what time it is; A man with two clocks is never quite sure. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
