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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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17th Oct 2009, 5:28 pm | #1 |
Pentode
Join Date: Jan 2007
Location: Stockport, Greater Manchester, UK.
Posts: 229
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Decca CTV problem
Hello Folks
My Decca console set has developed a problem and i'm hoping some of you knowledgable chaps may be able to point me in the right direction. I can only describe it as vertical 'cogging' as you'll see from the attached pic. Started off as intermittant but is now there all the time to one degree or other. Problem is i'm not sure really where to start looking My first thought was noise on the supply to the line osc, but then i wondered if it could be a sync problem, since i've seen this effect in the past on sets that were marginally out of tune. I have a manual for a 100 chassis but i'm led to believe this is a 110? Any assistance would, as usual be very greatly received. Regards, Stu |
21st Oct 2009, 11:28 am | #2 |
Nonode
Join Date: Jan 2004
Location: 1966-1976 Coverack in Cornwall and Helston Cornwall. 1976-present Bristol/Bath area.
Posts: 2,965
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Re: Decca CTV problem
Not to familiar with this chassis but I would check the supply line smoothing and decoupling. Does the effect vary with brightness levels, if so then check capacitors especially electrolytic ones around the power supply.
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Simon BVWS member |
21st Oct 2009, 11:45 am | #3 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Decca CTV problem
Allsorts can cause this and the fact you say was intermitent,i would check an old favourite.CRT earthing.
David |
23rd Oct 2009, 7:32 pm | #4 |
Pentode
Join Date: Jan 2007
Location: Stockport, Greater Manchester, UK.
Posts: 229
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Re: Decca CTV problem
Chaps,
Thanks for the replies Hopefully the weekend will allow me some time to get in amongst it. I'll let you know how I fare Thanks again, Regards Stu |
21st Dec 2009, 8:51 pm | #5 |
Nonode
Join Date: May 2006
Location: St Albans, Herts, UK.
Posts: 2,193
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Re: Decca CTV problem
Hi Stu.
How did you get on with this in the end?
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All the very best, Tas |
21st Dec 2009, 9:18 pm | #6 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,573
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Re: Decca CTV problem
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23rd Dec 2009, 7:03 pm | #7 |
Pentode
Join Date: Jan 2007
Location: Stockport, Greater Manchester, UK.
Posts: 229
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Re: Decca CTV problem
Hi Tas
Well the truth is the sheer volume of 'normal' work has meant I haven't had a sniff of a chance to play with it so far. Its the living room set as well, so that gives you some idea of how much tv i've watched! (Plus I need to buy a new digibox as my 2k one went off with the analogue change over) Symon - Thats useful information thanks very much Hopefully sometime beetween Christmas and new year I'll find some time (I'm on call xmas and boxing day ) As soon as I've some news, I'll report back. All the best, Stu |
23rd Dec 2009, 7:37 pm | #8 |
Nonode
Join Date: Jan 2004
Location: 1966-1976 Coverack in Cornwall and Helston Cornwall. 1976-present Bristol/Bath area.
Posts: 2,965
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Re: Decca CTV problem
Hi Stu, I do feel for you because of the same reasons my Decca has been broke since the summer. I am hoping to get on with mine over the few days holiday coming up. Best of luck with your fault.
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Simon BVWS member |