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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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16th Jan 2023, 6:41 pm | #1 |
Pentode
Join Date: Jul 2010
Location: Nottingham, Nottinghamshire, UK.
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Ferranti TC1004 (Ekco T311) spot suppression
Hi there folks, towards the end of Autumn, while the weather was still warm(ish), I stripped, cleaned and re-varnished the cabinet of my Ferranti TC1004 (EKCO T311). Today, I’ve been busy re-assembling the television and on testing I realised I still had a few things to sort out.
There doesn’t seem to any form of spot suppression on this model. On switch-off, I am left with a very bright spot that slowly fades out over about 30 seconds. Is this normal? I am currently running the set without the metrosil fitted, would fitting that make much difference? Dave |
16th Jan 2023, 6:51 pm | #2 |
Pentode
Join Date: Dec 2009
Location: Chatteris, Cambridgeshire, UK.
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Re: Ferranti TC1004 (Ekco T311) spot suppression
I believe so yes as it will discharge the EHT upon switch-off.
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Andrew |
17th Jan 2023, 5:19 pm | #3 |
Pentode
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Location: Nottingham, Nottinghamshire, UK.
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Re: Ferranti TC1004 (Ekco T311) spot suppression
Thanks Andrew. The metrosil has been re-fitted and yes, it made a difference, but I still get a bright spot for a few seconds. I guess that’s normal and there is no provision on this model for spot suppression.
Dave |
17th Jan 2023, 6:36 pm | #4 |
Octode
Join Date: Apr 2005
Location: Peterborough, Cambridgeshire, UK.
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Re: Ferranti TC1004 (Ekco T311) spot suppression
I think some dual standard PYE sets had a connection to the neutral on the power switch this provided spot suppression. I may be wrong as the memory is vague, in the case that the power was disconnected rather than the set switched off by the sets' own switch you would then get the switch off spot... I think...
Have you checked the diagram to see how suppression if any is provided? Rich |
17th Jan 2023, 7:27 pm | #5 |
Banned
Join Date: Dec 2022
Location: Peterborough, Cambridgeshire, UK.
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Re: Ferranti TC1004 (Ekco T311) spot suppression
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18th Jan 2023, 6:11 pm | #6 | |
Pentode
Join Date: Jul 2010
Location: Nottingham, Nottinghamshire, UK.
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Re: Ferranti TC1004 (Ekco T311) spot suppression
Quote:
Dave |
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18th Jan 2023, 8:09 pm | #7 |
Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 7,572
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Re: Ferranti TC1004 (Ekco T311) spot suppression
Oh the switch-off spot! Yes a lot of sets showed it. No-one ever took any notice since it was normal (with most sets) at the time. There used to be a joke going around that some kids will watch the TV all the time and won't stop until the spot fades away......
My little Fergy portable (model 45) has a switch-off spot. I had thought about modding it in the same way the Pye used to do it (as in the threads above) but it doesn't seem to bother the tube so probably not worth it.
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20th Jan 2023, 10:19 am | #8 |
Pentode
Join Date: Jul 2010
Location: Nottingham, Nottinghamshire, UK.
Posts: 231
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Re: Ferranti TC1004 (Ekco T311) spot suppression
Tried re-wiring the brightness control to mains neutral lead before the switch - works perfetly, thanks.
Dave |