A Christmas Tale remembered
Mitsubishi PAL Decoder
Converge The RBM A823
Murphy Line Output Transformer Replacement
1977/78 22″ ITT CD662; CVC30-Series
1982 20″ ITT 80-90 Model (unknown)
Retro Tech 2025
Fabulous Finlandia; 1982 Granada C22XZ5
Tales of woe after the storms. (2007)
Live Aerial Mast
Total collapse
What Not To Do
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
A Christmas Tale remembered
Mitsubishi PAL Decoder
Converge The RBM A823
Murphy Line Output Transformer Replacement
1977/78 22″ ITT CD662; CVC30-Series
1982 20″ ITT 80-90 Model (unknown)
Retro Tech 2025
Fabulous Finlandia; 1982 Granada C22XZ5
Tales of woe after the storms. (2007)
Live Aerial Mast
Total collapse
What Not To Do
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
Diode Split LOPT Testing: Diemen STVDST-01 Flyback tester
Over the years when a LOPT was under suspicion I've used the age old method of ringing with a scope and occasionally using the JABCO LOPT tester to see if all is well or not!
The diode split LOPTS found in later sets I've not had much dealing with but do now have a few sets in the collection that have them installed. Those that know me will know I have an interest in test equipment, even if it is infrequently used, so in to the fray steps the HR Diemen flyback tester. I've occasionally seen these turn up on e-bay but never really considered buying one. Norman however whilst clearing out all his kit, kindly passed one on to me with the box of service data, it came boxed with all its leads, manual and technical data.
Now other than the handful of sets in the collection with these diode split LOPTS installed, I only had a couple of loose ones in stock. One is a brand new one I bought for one of the B&O sets and the data book does not have it listed for connections to the tester. The other is a manky pull from what appears to be a Ferguson TX80, its code being HR 7527, now that was in the book.
Consulting the data I connected all the leads to the specified pins. The manual shows the kV value I should expect to be displayed upon testing a good LOPT. For this LOPT '27kV' but instead all I get is the red LED lit and a first segment error code of '5'.
This means there is a direct short circuit in the primary feed terminal or in the initial coil of the primary winding near the feed terminal. This can be verified with an oscilloscope showing no return pulse only continuous feed voltage but pulses being present in auxiliary windings.
Bored yet? Sorry just thought it might be of interest and I suspect there might be a few old hands ( R2B, JCB, etc) who may have used one in the past and enjoyed seeing one again.
D'you know, I'm sure I have one of those buried in a store...? Turned up in a mixed box of junk from a Chas Miller auction, I think.
I will offer them safe harbour in crusty stores. I'll catalogue them and should myself or anyone be in need in the future, well we will be sorted. We can't have rocking horse doo doo's being lost to landfill now can we. ?
Hi Chris, I will look for a suitable box and get them off to you in the next few days. Now what else do I want rid off!!! Norman
I'll have that 19" GEC 2028 you forgot about lurking under your desk ? ?
Don't suppose you have a Betamax eccentricity alignment tool?
Hi Chris, I had a 2028, it was our first tv when we got married. I got it from the place I worked it came in as a trade in. My boss was tight as the proverbial duck backside and wouldn't let me have for free, it was on the scrap pile. I got it for £20 but the tube was poor. I fitted a regun which I acquired for free from work and used it for many years. I later sold it to an aunt who also had it for years. It was very reliable and always had a great picture.
On the subject of vcr's I don't have any tools for the Betamax range but I will have some bits and pieces for vhs. You may have them in your service kits. I will have a proper look and see what I have left. All the best, Norman
Posted by: @crustytvOver the years when a LOPT was under suspicion I've used the age old method of ringing with a scope and occasionally using the JABCO LOPT tester to see if all is well or not!
The split diode LOPTS found in later sets I've not had much dealing with but do now have a few sets in the collection that have them installed. Those that know me will know I have an interest in test equipment, even if it is infrequently used, so in to the fray steps the HR Diemen flyback tester. I've occasionally seen these turn up on e-bay but never really considered buying one. Norman however whilst clearing out all his kit, kindly passed one on to me with the box of service data, it came boxed with all its leads, manual and technical data.
Now other than the handful of sets in the collection with these split diode LOPTS installed, I only had a couple of loose ones in stock. One is a brand new one I bought for one of the B&O sets and the data book does not have it listed for connections to the tester. The other is a manky pull from what appears to be a Ferguson TX80, its code being HR 7527, now that was in the book.
Consulting the data I connected all the leads to the specified pins. The manual shows the kV value I should expect to be displayed upon testing a good LOPT. For this LOPT '27kV' but instead all I get is the red LED lit and a first segment error code of '5'.
This means there is a direct short circuit in the primary feed terminal or in the initial coil of the primary winding near the feed terminal. This can be verified with an oscilloscope showing no return pulse only continuous feed voltage but pulses being present in auxiliary windings.
Bored yet? Sorry just thought it might be of interest and I suspect there might be a few old hands ( R2B, JCB, etc) who may have used one in the past and enjoyed seeing one again.
I had one at the shop. Worked well
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