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
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
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
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
We had the ITT agency so we would have sold a few of these sets but I don’t remember much about them, so they would have been reliable. BW sales were few compared with the colour sets in the 70’s for the shop I worked at.
Callins were like Hunts paper capacitors, suspect and very often faulty. The Mixed dielectric caps in the set are worth testing.
Frank
Posted by: PYE625As a matter of interest, it looks like there are several mixed dielectric capacitors dotted about plus one or two black Callins electrolytics. For instance, C82 in the PCL805 cathode circuit is a Callins 100uf...… Hmm I wonder....
Doubt that has anything to do with the lack of frame hold, but it'll certainly muck up the linearity...
That set just looks so... modern inside. And a PCB too! But I do like it
Any attempt to increase the scan further than that shown in the above photo results in loss of frame lock.
To understand the black art of electronics is to understand witchcraft. Andrew.
Some good advice here from John Walekey over at the UKVRRR. See post #40.
Looking great so far.
https://www.vintage-radio.net/forum/showthread.php?t=149566&page=2
That's weird how capacitors that measure absolutely fine for capacitance and leakage just simply don't work!
That ITT/KB looks like it's going to produce an excellent picture once the frame is sorted.
Regards,
Lloyd
Posted by: Cathovisor
That set just looks so... modern inside. And a PCB too! But I do like it ?
It does and I like the look of it.
We started selling the ITT range due to disappointment with the offering of Pye 697 chassis and the RBM range. We wanted a range of large screen CTV’s, Hitachi and Toshiba were only small screen up to 20 inch sets at that time. The ITT range were reliable sets for us.
Frank
The Callins 100uf electrolytic in the cathode of the PCL805 proved ok. However, C77,78 and 81 in the frame stage are not. The values have increased and they are slightly leaky at only 320vdc. I can assume that the remainder of the mixed dielectric capacitors are likely to be in a similar condition. I have ordered replacements of the suitable values and voltages.
After substituting C78 and C81 (0.022UF 1000V) a dramatic improvement was seen. The ones I have are only rated at 400v, but were sufficient to temporarily prove the point.
To understand the black art of electronics is to understand witchcraft. Andrew.
Mixed dielectric - the worst of both worlds! Treat as paper IMO.
I couldn't agree more Mike. The above result speaks for itself.
To understand the black art of electronics is to understand witchcraft. Andrew.
I wasn't aware those grey Plessey caps were mixed dielectric to be honest; one day I may have to go through my stock of NOS and excise them if I have any.
I am assuming they are mixed dielectric, but if not, they are not good quality. The two removed ones behave like paper capacitors in as much as they take a longer time for a DC voltage to reduce through them, but never quite make zero vdc leakage. Whereas a new polyester film capacitor is at zero almost immediately.
To understand the black art of electronics is to understand witchcraft. Andrew.
Cut one open, perhaps? Increased capacity is often seen when paper caps go 'leaky'.
Apart from the colour they look very similar to TCC Duomold capacitors, Duo, mixed dielectric?
Frank
I think it can be safely said without doubt they are mixed dielectric. It is clear to see the polythene on one side and thin paper on the other side of the foil.
To understand the black art of electronics is to understand witchcraft. Andrew.
We have evidence. Nice one, Andrew.
Why on earth they could not have made them with polythene on BOTH sides is beyond me.
To understand the black art of electronics is to understand witchcraft. Andrew.
It certainly is Mike, and I'm very pleased with it.
For one thing, I can't fault the convergence or greyscale.
To understand the black art of electronics is to understand witchcraft. Andrew.
Excellent picture, I wonder if the capacitors were made by TCC or was Plessey and TCC now part of the same companies?
Back in Suffolk, childminding duties for the next 10 days or so, post when I can. Had the family with me in Wigan for a week, just driven them home to Suffolk.
Frank
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