1983 Philips 26CS3890/05R Teletext & Printer
MRG Systems ATP600 Databridge
Teletext Editing Terminal
Microvitec Monitor 1451MS4
BBC Microcomputer TELETEXT Project
Viewdata, Prestel, Philips
Philips Model Identification
1976/77 Rank Arena AC6333 – Worlds First Teletext Receiver
PYE 1980s Brochure
Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
Zanussi Television Brochure 1982
Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
Wireless World Teletext Decoder
Unitra Brochure
Rediffusion CITAC (MK4A)
Thorn TRUMPS 2
Grundig Brochure 1984
The Obscure and missing Continental
G11 Television 1978 – 1980
Reditune
Hitachi VIP201P C.E.D Player
Thorn 3D01 – VHD VideoDisc Player
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
1983 Philips 26CS3890/05R Teletext & Printer
MRG Systems ATP600 Databridge
Teletext Editing Terminal
Microvitec Monitor 1451MS4
BBC Microcomputer TELETEXT Project
Viewdata, Prestel, Philips
Philips Model Identification
1976/77 Rank Arena AC6333 – Worlds First Teletext Receiver
PYE 1980s Brochure
Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
Zanussi Television Brochure 1982
Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
Wireless World Teletext Decoder
Unitra Brochure
Rediffusion CITAC (MK4A)
Thorn TRUMPS 2
Grundig Brochure 1984
The Obscure and missing Continental
G11 Television 1978 – 1980
Reditune
Hitachi VIP201P C.E.D Player
Thorn 3D01 – VHD VideoDisc Player
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713

Finally sussed it.
![]()
For some reason C273 was missing from my board.
That's the problem with sets of unknown history. You never know what has been done (or undone) in the past. Excellent results Chris
Now what about 405.....?

So what's the story on 405 line?
Now what about 405.....?
As I said the other day I had all manner of weird things going during that lock problem. I briefly looked at 405 and it worried me. I also stated I wanted to be sure of things before committing to post. When I switched to 405 briefly at that time I had a 1" high about 10" long defocussed raster. The line whistle from the set was deafening and didn't sound right at all. With 625 finally sorted I was more confident the tide was turning on this set and its protest at being awoken. Switching to 405 brought up a full raster but the line speed was way off. Adjusted R478, L431 & R402 405-line is working fine, just a little fold-over on the right, other than that, this set is done. The RCA tube seems to be getting better with prolonged use.
The black and white is superb on 405, I think I now need to adjust the controls to balance B&W on both 405 & 625, There is a procedure for this.

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Finally sussed it.
![]()
For some reason C273 was missing from my board.
That's the problem with sets of unknown history. You never know what has been done (or undone) in the past.
Precisely - it might have been removed because it was diagnosed as being faulty, and was awaiting the fitting of a replacement part...

One thing I have not done yet is check the EHT since first obtaining a raster.
During the troubles and the unregulated EHT with the arcing a spitting going on, as advised I fixed the "Set EHT" slider to minimum. I have not since measured EHT with my wand, frankly on three colour sets now I had flash-overs using them so its proved too risky. What I needed was a simple and reliable way to measure EHT without using the wand type meters.
Thankfully, in steps a good friend who had a professional Brandenburg EHT monitor going spare. After an exchange of beer tokens, said EHT meter arrived this morning. This meter is the dog's danglies when it comes to testing EHT on a colour TV as its in-line. You plug the input lead into the final anode of the CRT, the sets final anode lead then plugs into the top of the meters input lead. Safe testing with no risk of flash-over and the ability to constantly monitor EHT.


Already I've noticed on TCF EHT is mainly static but does fluctuate by 1 or or even 2kV. Not sure I thought valve stabilised EHT was supposed to be rock solid. Its possible the Shunt valve needs replacing, I will dig a new one out and see.
The main revelation which leaves me stunned, I've been getting this cracking picture with just 15kV!!!!
I wound it up to just a little over 20kV and checked the EHT current was still set to 1.2V. This 20kV will do nicely and gives the old RCA tube lopt and tripler a gentle life. I've read its good practice to run with reduced EHT so all my TV's are set around 22kV.

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Crusty's TV/VCR Collection: View my collection

15kV? Might be worth just double checking the EHT reading on the Brandenburg against a 'conventional' meter, just in case. These should read high by comparison due to the minimal current draw.

15kV? Might be worth just double checking the EHT reading on the Brandenburg against a 'conventional' meter, just in case. These should read high by comparison due to the minimal current draw.
Agreed on that! You have no idea of the accuracy or calibration of the new EHT meter. There are only a few milliamps to play with and it won't take much to pull the EHT down and give a false reading. I suggest you check another set where you have already set the EHT, measure it on the new meter and see what the difference is.
Those Brandenburg meters may be for high voltage, higher current measurements. As an aside, Brandenburg are well known for making insect killers, the type with UV lamps with a high voltage grille behind them so the unsuspecting insect flies towards the UV tubes and gets zapped as well. Those grilles run at about 5 mA......they bite! The meters may well be suitable for the insect traps but not for TV.

Nothing wrong with the Brandenberg.
I built an extra large rubber shield for my wand from a hot water bottle. I know the wand to be accurate having used it on many B&W sets and a few colour. I checked and EHT with the wand is 20kV. Then fitted the Brandenburg and that read 20kv.
CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection

The Brandenburg 88M is a very, very good meter.
Input resistance is 45 GΩ, so the load is negligible.
Jac

That's excellent news, Chris. I used to use exactly these ones at work - for setting the EHT on colour monitors, oddly enough.
And Jac - thanks for confirming what the input resistance is; I knew it was pretty high!
Brandenburg are famous for everything HV: I remember their power supplies in caption scanners and the like.

Well worth double-checking though.
Excellent results.

Stunning job Chris.
You've done it again, Chris. A real demonstration of tenacity considering the number of steps backwards you were forced to take - excellent work and a learning curve for most of us.

You've done it again, Chris. A real demonstration of tenacity considering the number of steps backwards you were forced to take - excellent work and a learning curve for most of us.
Couldn't agree more.
A very interesting set and quite a different kettle of fish to my easy Pye CT72.
To understand the black art of electronics is to understand witchcraft. Andrew.

Nice to see you got the Baird working Chris, well done.
Andy.
Curiously curious

Hi Chris, I hope I'm not going to put he mockers on it but that really looks very good indeed now. it just goes to show that following the complete setup procedure in the manual really pays dividends. A excellent result .
John.
John.
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