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Forum 135

CTV LEDCO Solid State CDA Panel PYE 691, 693, 697

Colour Television

Last Post by slidertogrid 11 months ago

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crustytv

(@crustytv)

Posts: 12137

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As mentioned elsewhere, I'm prepping my EKCO CT252 for sustained use over this Christmas. To that end and for peace of mind, I wanted to replace the black focus unit and reduce the heat by fitting the elusive SS CDA, trouble being, finding one.

Both these requirements have been fulfilled, and I have a brand new, never used CDA, once again thanks to the N.E. PYE dealer.

I've heard of these panels but never seen one in the flesh, I've also the schematic, later today I'll take more detailed photos and also post the cct. For now, just a quickie teaser.

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Posted : 09/10/2023 1:24 pm

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Nuvistor

(@nuvistor)

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@crustytv I have not seen one before, I have used the solid state PL802. I managed to alleviate at lot of problems on the CDA board with stand off valve bases and stand off WW resistors. When I left the trade those boards were still working but probably getting worse for wear, the line time base panels were also showing problems by that time. No doubt if I had stayed in the job I would have been using the LEDCO panel and getting replacements for the line time base boards.

The CDA boards in the earlier 691/3 chassis didn’t seem to suffer the same.

Frank

Posted : 09/10/2023 3:04 pm

crustytv

(@crustytv)

Posts: 12137

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As promised, more detailed photos of the solid state LEDCO CDA and the cct.

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Posted : 09/10/2023 3:57 pm

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Nuvistor

(@nuvistor)

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@crustytv It looks very well made. 👍

Frank

Posted : 09/10/2023 6:48 pm

slidertogrid

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Posted by: @nuvistor

↑

@crustytv

The CDA boards in the earlier 691/3 chassis didn’t seem to suffer the same.

I think there was two reasons for that, the earlier panels were made of better material, especially the ones with the red screen printing. Also the earlier sets were better ventilated, there was more room inside the cabinet and the ventilation slots in the back cover were bigger. The 26" CT203 didn't suffer as much as the 22" versions again because the bigger cabinet ran cooler.

We used to fit a fair few of the LEDCO SS CDA boards they were pretty good but not faultless. Later on we modified them slightly, we removed the big heater ballast resistor fitted it on longer wires and mounted it over on the timebase so the hot parts were all on one side away from the transistorised side of the chassis. The panel could still be unplugged and removed of course it just meant removing the resistor from the timebase side. Thus modified and sometimes with a regun tube the sets carried on well into the 1980s and were fairly reliable.

Posted : 09/10/2023 9:29 pm

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