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
ITT CK505
The first ITT sets we sold, only faults I can remember them having was the frame output transistors and an occasional tripler. No doubt I fixed other faults on them but that info is lost in time.
Nice set and they had a good picture.
Frank
Hi Frank
We sold the cvc25/32 where I worked . It was the usual thing in that the 90degree chassis was more reliable than the 110degree version. The only problem I face so far is that I have no service manual.
Regards.
Gary.
colourmaster said
The only problem I face so far is that I have no service manual.Regards.
Gary.
Hi Gary,
That's the beauty of being a member of Radios-TV, almost all our members service data needs can and are met.
Give me a couple of days to get the whole thing scanned ( I need to make some progress top light on my Baird) but if in the meantime you need and particular circuit snippet uploaded to your thread, I can do a quick ad-hoc scan of that part to get you going
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Hi Chris, that's great many thanks. In the meantime I'll have a go at it . My memory might come flooding back .
Regards.
Gary.
Hi everyone, I've made a start on this set today . Looking inside it looks in good condition so I switched on and was rewarded with a good colour picture but the width is lacking abit . The control has no effect so the E/W transistor must be open circuit, I seem to remember them failing. Also the line sync was lost but was put right with a new TBA920 ic. As it was running it's now developed an agc fault .that will be in the IF can . The chassis is a CVC20/2 . I'll wait until I can obtain some service information so that's it for now.
Regards.
Gary
One problem I do remember with these sets was the inductors in the line time base being noisy, line whistle, not at 15khz but they rattled and it could be loud. I think, not sure now, but ITT suggested wood glue, the white stuff, to quieten them down. Did the inductors/transformers get dry joints on the PCB or am I thinking of other TV's?
When I look back there is so much I have forgotten about most of the TV's, radios etc that were bread and butter repairs.
Frank
This was quite common in a lot of sets and was normally caused, as you say, by an inductor rattling away somewhere in the line stage (or in the case of the Philips G11, the mains input choke). It was a harmonic that usually caused the rattle which is why it always sounded lower than the line whistle. Araldite was a popular solution or, if you were out in the field and had 20 jobs to do, a matchstick wedged into the winding could provide a worthwhile reduction in the noise.....!
Is this the thing we used to call a "transductor"? - Three windings side by side on two 'E' shaped ferrite yokes in a glued together face-to-face configuration and half submerged in a potting compound with eight (or was it twelve?) legs protruding from below.
(trying to find a picture)
"transductor"
I don't remember that term, but has from previous post, a lot lost in the mists of time.
Nice little fun pamphlet from TDK on inductors.
http://www.global.tdk.com/news_center/publications/inductors_world/pdf/aaa60300.pdf
Frank
Hi Frank,
I was led to believe the word "transductor" is compounded from "transformer" and "inductor" - being neither, and both at the same time.
AC through one winding, DC through the other winding and vary the DC current to vary the reactance.
Frank
Hi Frank,
Yep, I saw that link earlier, but what I was looking for was a picture - best way to positively identify the device we're discussing here.
First instance of transductors I met were the devices used to provide AFC in some pre-war press button EMI radios.
Cathovisor said
First instance of transductors I met were the devices used to provide AFC in some pre-war press button EMI radios.
Correct me if I'm wrong but didn't the good old rotary dial telephone, GPO type 700 and the like, use a form of transductor to superimpose voice modulation (AC) onto the DC of the connected exchange line?
You're not thinking of the ASTIC, are you?
(Anti-Side Tone Induction Coil)
Hi Mike,
Could well have been. It's been a while (25~30 years) since I last played at restoring classic telephones. Nowadays, I prefer them to just 'plug 'n play'.
Hi Gary , nice set & good to see it working ,just a thought on the line sync fault I seem to remember the suflex capacitor on the line osc pcb causing the demise of the TBA920
great progress
Chris
Service data for the ITT CVC20-2 chassis can now be found in the data library
CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection
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Crusty's 70s Lounge: Take a peek
Hi Chris many thanks for that . Now I can continue the restoration. Regards. Gary.
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