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Old 19th Jun 2018, 5:02 pm   #1
markchid
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Default In search of Denco IFTs

Hi, I am in search of Denco IFTs (IFT14, IFT18 etc).

Clearly these are becoming extremely rare and difficult to get hold of, but if anyone has any, or know where I may be able to find them I would be happy to pay good money - within reason

Thanks!
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Old 20th Jun 2018, 7:33 am   #2
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Default Re: In search of Denco IFTs

Hi Mark and welcome to the forum

As you already know these turn up even less often than the plug in coils.

If they don't have to be Denco Weyrads seem to turn up in some early transistor sets.

I have found one or two hidden away in old projects.

Loft clearances and miscalenous lots at boot sales and auctions so good luck in your quest

Cheers

Mike T
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Old 20th Jun 2018, 11:10 am   #3
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Default Re: In search of Denco IFTs

Hi and welcome to the forum. Unfortunately some components, especially coils, seem very difficult to source. Often the only way to obtain them is to strip an existing piece of kit. The big problem with this is that even with the service data it is difficult to identify third party components. At least you can work out the connections.
Good luck!
Peter
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Old 20th Jun 2018, 11:38 am   #4
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Default Re: In search of Denco IFTs

Do you have any pictures of drawing of these? I have a number of unused and unidentified IFTs.
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Old 20th Jun 2018, 12:50 pm   #5
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Default Re: In search of Denco IFTs

You can see a few here:

https://www.worthpoint.com/worthoped...-khz-532411553

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Originally Posted by Reelman View Post
Hi and welcome to the forum. Unfortunately some components, especially coils, seem very difficult to source. Often the only way to obtain them is to strip an existing piece of kit. The big problem with this is that even with the service data it is difficult to identify third party components. At least you can work out the connections.
I am also looking for specs so I can build my own IFTs to closely match Dencos electrically and physically if possible.

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Originally Posted by Cobaltblue View Post
If they don't have to be Denco Weyrads seem to turn up in some early transistor sets.

I have found one or two hidden away in old projects.

Loft clearances and miscalenous lots at boot sales and auctions so good luck in your quest
Thanks Mike - yes I must get out to some boot sales! Will check out Weyrads. Was wondering if Toko coils can be used?
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Old 20th Jun 2018, 1:10 pm   #6
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Default Re: In search of Denco IFTs

Sorry, but the ones I have are shorter than that, almost cubes.
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Old 20th Jun 2018, 5:19 pm   #7
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Default Re: In search of Denco IFTs

Most Toko coils I have come across are a lot smaller than the Denco IF coils

Even Toko some types can be hard to find these days

Cheers Mike T
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Old 20th Jun 2018, 7:26 pm   #8
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Default Re: In search of Denco IFTs

Many Denco I.F.Ts were double tuned, and are about 35mm High x 12mm Square. Detector /3rd. I.F.t's were single tuned and ca. 18mm High x 12mm square. I've just measured those on a 1.6Mhz I.F. strip I built over 40 years ago, but the 465/470kHz I.F.Ts were, IIRC, the same dimensions. The only Weyrad coils of which I know were single tuned in round cans also about 18mm High, though they may well have made others. Toko (and other brand) Japanese I.F.Ts & Oscillator coils were all about 12.5mm square. Other info. on all these is almost certainly available from the internet.
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Old 21st Jun 2018, 11:27 am   #9
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Default Re: In search of Denco IFTs

The IFT's in the Bush TR82 are about the same size as the Denco ones and I think they are double tuned as well so I would like to get hold of some but it would be a shame to scrap a TR82!

Meanwhile I'm starting my Denco project with some IFT's from a Perdio kindly donated by Terry (Valvepower)
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Old 22nd Jun 2018, 1:12 pm   #10
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Default Re: In search of Denco IFTs

Hope this will be of some use.

I've attached photos of a new, unused IFT11, 465 IFT that is one of 4 I have. I will eventually built that receiver one day . They were made in 1998, when Denco briefly re-started production. They measure 38mm tall, by 17mm square. The capacitor inside is 68pf +/- 5%. I assume they are both the same value. The lower winding is covered with black tape.

All four samples I have, have the tuning slug quite a way out of the core, so I assume they've never been adjusted.

The last four papers are what I received after making an initial enquiry back in 1996.

Interestingly, I always thought that these were IFT11/455 , not 465, so i've only just discovered that!

Cheers

Aub
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Old 22nd Jun 2018, 1:14 pm   #11
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Default Re: In search of Denco IFTs

The last two papers.
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Old 22nd Jun 2018, 1:58 pm   #12
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Default Re: In search of Denco IFTs

So we have learned that the 465kHz IFT has a Q of 70 and C=68pF (I have a feeling that the original design used 65pF?). That goes a long way to enabling replication. They were probably slightly undercoupled - with the cores in the outermost tuned position?

1.6MHz Q is 100, and 10.7MHz Q is 90.

I too have some Denco IFTs, mainly 1.6MHz. I too will one day make that receiver!
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Old 25th Jun 2018, 1:23 pm   #13
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Default Re: In search of Denco IFTs

Thanks all!

Some great information - and photos too. Bit jealous - I must get out to those car boot sales - you never know.

I would 3D print the formers and build some kind of winder (assuming these are not easy to find!)

Mark
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Old 25th Jun 2018, 6:01 pm   #14
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Default Re: In search of Denco IFTs

Hi,

Whilst doing the mammoth pre-move de-clutter I found a Perdio PR73 transistor radio. The cabinet was very, very rough plus it gave up its ferrite rod aerial for a Hacker Mini Herald to survive - just need the strap handle for the Herald - but that's another want post for another time!

Anyway, it has some IFT's that maybe of use - they are single tuned but may help get a project underway.

This is FOC.

Pictures attached.

Regards
Terry
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Old 26th Jun 2018, 9:05 am   #15
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Default Re: In search of Denco IFTs

Hi Terry, I would be interested in that one as well, if Mark doesn't want it.
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Old 26th Jun 2018, 1:32 pm   #16
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Default Re: In search of Denco IFTs

Hi Trevor,

If Mark doesn't want it it's yours.

Regards
Terry
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Old 27th Jun 2018, 5:33 pm   #17
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Default Re: In search of Denco IFTs

Hi Trevor,

Consider the Perdio PR73 PCB yours.

I'll PM you.

Regards
Terry

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Hi Terry, I would be interested in that one as well, if Mark doesn't want it.
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