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Tech Chat KT3 Archeology

Components, PCB's, Modules

Last Post by crustytv 5 months ago

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crustytv

(@crustytv)

Posts: 12218

Vrat Founder Admin

Topic starter

Besides the new old stock KT3 chassis, I have another chassis that is a pull, but it is in remarkable condition. There's hardly any evidence of repairs other than a new tripler. Time for some Tony Robinsonesque TV chassis archaeology, why did this remarkably tidy, clean chassis end up naked.

The first clue found is the model identifier 51K7323/15T and this lead to the brochure page.

Next, with the chassis looking like new, what was the cause of its retirement?

The CRT panel reveals all RGB guns are wound up to the maximum, and to cap it all S603 & S604 are gone, just replaced with solder braid. It's pretty safe to say they have rung every last ounce of emission out of the TVs CRT.

I've heard this scenario many times from TV engineers, here is the evidence. I've also heard tales of the 20" suffering, especially when I go my 1984 PYE 51KT3260/05T. I'm very lucky as that one does not have its two 12uH chokes shorted, and the tube is strong.

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Posted : 29/10/2024 5:29 pm

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KT3

Cathovisor

(@cathovisor)

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Nice looking set.

Posted : 29/10/2024 5:45 pm

slidertogrid

(@slidertogrid)

Posts: 1403

Prominent Member Registered

Many KT3s were run into the ground like that. Half a coil shorted then a whole coil. When it got to the stage that both coils needed shorting it was time to retire the set. We used them as "banger loan sets" when they got that bad. It is surprising how long they would last like that.

I had a nice little earner late in the KT3s life. I got my hands on a load of 14" monitors that had been used as terminals somewhere, I think maybe bookies shops. The front panel had no channel selector buttons the chassis was standard but with with no Tuner or IF module the decoder was replaced with an interface connected to a box with a GPO type jack plug.

All you needed was a scrap 20" with a dud tube. The front panel on the 20" was the same size as the 14" so the hole in the front was the same size, the plugs were all the same so fit the front panel, modules, tuner and aerial socket and you had a 14" portable which were always sought after second hand. I converted them as the 20" scrappers became available. Some even became remote control if the donor was remote. The remote board fitted inside ok and with a few cable ties stayed put!

I saw quite a few sets with the coils removed and shorted with braid like that, we didn't do it that way but someone local obviously did. Do you know where the chassis came from Chris?

22" K30s were given another lease of life with a tube donated by a scrap Amstrad "superwide". they always had a good Mullard A56 540x the set didn't last long enough to wear it out!

Posted : 29/10/2024 6:33 pm

crustytv

(@crustytv)

Posts: 12218

Vrat Founder Admin

Topic starter

I've removed the braid short links and reinstated the missing coils from a scrap RGB module.

CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection

Posted : 07/11/2024 8:31 am

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