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Old 19th Oct 2020, 9:57 am   #41
Welsh Anorak
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Default Re: Dicey Decca CTV25

Well done - that fault was a bit unfair!
That presentation looks a lot nicer than the more ordinary door-free CTV25.
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Old 19th Oct 2020, 10:21 am   #42
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Default Re: Dicey Decca CTV25

Great work Mike. having the same fault on two sets of scanning coils is one hell of a coincidence.
Do they just use one 4.7M resistor in the focus circuit, most hybrid sets had two such resistors. I will have to dig the circuit out when I get home from work.
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Old 19th Oct 2020, 1:13 pm   #43
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Default Re: Dicey Decca CTV25

Hi Trevor, Gary, Glyn and Simon.

Thank you for your kind replies.

Re the coils - Yes, it was a little unexpected to say the least.

I've made a start on the other bits and bobs but alas the 625/405 solenoid has melted, jammed the plunger in place and gone open circuit so another solenoid is required. If I can find one then some kind of fusible circuit may be in order to protect it from jamming again. I have a vague feeling that it might be the same as that used in the Philips G6* - not that that's really much help in finding one, although it increases my chances a little. It's the kind with the flip-flop switch on the end to turn off the power once it has been fully engaged.

I'll report my progress.

Thanks all.

Kind regards.

From Mike.

*Edit. Oh dear, I've just checked and it's not the same. Never mind...
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Last edited by Mikey405; 19th Oct 2020 at 1:29 pm.
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Old 20th Oct 2020, 12:41 pm   #44
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Default Re: Dicey Decca CTV25

...and here was I about to offer you a G6 convergence solenoid.
Pre-Bradford Deccas were very unusual visitors to the workshop - probably as they were around twelve years old by the time I started!
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Old 20th Oct 2020, 1:22 pm   #45
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Default Re: Dicey Decca CTV25

Thank you for the kind thought Glyn. I'll take a photo of the solenoid in case anyone might have one. It has a square "peg" on each end with a hole drilled to attach to the switches of the IF and line timebase panels and a 47R resistor underneath.
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Old 20th Oct 2020, 1:29 pm   #46
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Default Re: Dicey Decca CTV25

I like it. That cabinet is almost big enough to appeal to the american market
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Old 20th Oct 2020, 2:18 pm   #47
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Default Re: Dicey Decca CTV25

Hi Kevin.

Yes, it is a bit of a behemoth - I used to have an identical one in a dark Rosewood cabinet many many years ago but I think I prefer this lighter-coloured model.

In case anyone might happen to have a spare, here's a picture of the melted solenoid. I guess it could be rewound and repaired but I think it has melted the plunger and plastic former so likely not really worth all the bother.

Thanks Kevin and everyone.

Kind regards.

From Mike.
Attached Thumbnails
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Name:	Decca Solenoid.jpg
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Old 20th Oct 2020, 2:47 pm   #48
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Default Re: Dicey Decca CTV25

If all else fails, from the picture it appears to have a lot in common with the Thorn 950/1400 series solenoid. John.
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Old 20th Oct 2020, 3:43 pm   #49
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Default Re: Dicey Decca CTV25

Hi Mike.

I found one in a box of spares in the garage, see attached pics. It looks to be the same solenoid. I've checked that the plunger moves freely and the windings seem fine. Yours for the cost of the postage. PM if interested.

Regards,
Symon.
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Old 20th Oct 2020, 4:14 pm   #50
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Default Re: Dicey Decca CTV25

Oooh. That looks like the very one Symon. Thank you. I will indeed send you a PM.

Kind regards.

From Mike.
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Old 20th Oct 2020, 7:49 pm   #51
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Default Re: Dicey Decca CTV25

my paternal grandparents had one of these sets and I wish I had known when they wanted to get rid cos I would have loved it. The sound was superb I have no idea what the speakers were that were used in it
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Old 20th Oct 2020, 8:08 pm   #52
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Default Re: Dicey Decca CTV25

Quote:
Originally Posted by Mikey405 View Post
Oooh. That looks like the very one Symon. Thank you. I will indeed send you a PM.

Kind regards.

From Mike.
Hi Mike.

Just wondering did you send me a PM?

Regards,
Symon
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Old 20th Oct 2020, 8:34 pm   #53
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Default Re: Dicey Decca CTV25

Quote:
Originally Posted by Mikey405 View Post
If I can find one then some kind of fusible circuit may be in order to protect it from jamming again.
Hi Mikey,
How about a mains rated polyswitch that is rated to trip just below the solenoid operating current? The solenoid will switch itself off before the polyswitch trips.
I used the same idea in one of my strowger demo exchanges to protect the release magnets, much nicer than using heat coils.

Cheers
Andy
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Old 21st Oct 2020, 5:10 pm   #54
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Default Re: Dicey Decca CTV25

Hi Andy.

That's a very good plan and I shall look into that. They're pretty clever those devices. What I was thinking was a time-based protection with a short R/C circuit to trigger a small transistor and then a relay to remove the earth return but your idea sounds like a much more elegant solution. I shall investigate further.

Thanks Andy.

Kind regards.

From Mike.
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Old 23rd Oct 2020, 12:24 pm   #55
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Default Re: Dicey Decca CTV25

Hi Mike,

I've just caught up with this, I have to say that the set looks very nice, well done on finding that fault with the soldering on the coils, that would have driven me around the bend! As Tas said, excellent detective skills!

All the best old mate.
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Old 23rd Oct 2020, 12:45 pm   #56
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Default Re: Dicey Decca CTV25

Well done Mikey, all the cumulative years of knowledge, experience, fault finding, repairs on this forum, and we’re still learning...
Regards, Alan.
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Old 24th Oct 2020, 10:02 am   #57
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Default Re: Dicey Decca CTV25

Thanks Lee and Alan for the kind comments.

Well, thanks to Symon (Philips210) I now have a nice new (well, new-to-me anyway) solenoid for the Decca. I'm currently at work (listening to our own Steve James - Colourstar - playing test-card-friendly music on Serenade Radio) but I'll get the solenoid soldered in (and clean and free the system switch) this evening and report back.

Thanks all.

Kind regards.

From Mike.
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Old 24th Oct 2020, 11:02 am   #58
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Default Re: Dicey Decca CTV25

Hi Mike.

That's great, I am pleased it arrived safely. I have the other solenoid which I think is for the convergence box and parts of the system switch. When I find a suitable box, I'll drop them in the post F.O.C.

Regards,
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Old 24th Oct 2020, 2:32 pm   #59
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Default Re: Dicey Decca CTV25

Thanks Symon. That's very kind of you. I'll report back once the solenoid is fitted.

Kind regards.

From Mike.
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