Parts donor - receiver? - UK Vintage Radio Repair and Restoration Discussion Forum

kellys_eye · 30th Apr 2018, 8:25 am

I want to experiment with some simple radio reception circuits (superhet) using discrete components and 'proper' tuned circuits. I'm referring to the miniature IFTs with the red/white/yellow tuned cores.

Since IFT's aren't that easy to come by I was hoping to use an old transistor radio as a 'parter' - there have to be dozens that could fit the bill and not grate on ones conscience for dismantling in such a way.

Can anyone recommend a make/model of set that would provide me with such parts and that wouldn't cause cardiac arrest in the community for the horror I'm about to comit

Ideally the make/model would be common such that if I wanted to duplicate any construction then I'd be able to (re)access additional parts in the same way.

Radio Wrangler · 30th Apr 2018, 9:03 am

You could also get IFTs from the radio section of a dumped music centre or radiogram, which widens your range of availability.

If you go for a Japanese built set rather than a Hong Kong or Chinese one, you may be able to find data on the IFTs in an archived Toko catalogue.

If you fancy being really experimental, you could look for a 12kHz wide crystal filter on 1.4MHz and build an up-converter. Long and medium waves in one band with no gap. I've found these filters on amateur radio rally stalls in the past.

David

G8UWM-MildMartin · 30th Apr 2018, 9:17 am

The common and cheap Chinese radio kits (HX108, S66E etc.) contain those IFTs and would save the trouble of de-soldering. (IFTs are not the easiest things to remove.)

Radio Wrangler · 30th Apr 2018, 9:38 am

Hold can, pull gently, play small blowtorch on reverse side of PCB.

It all depends on what you want to keep.

david

radioman · 30th Apr 2018, 10:04 am

I'd recommend looking out for an old/rough-looking Fidelity set from the late 60's/early 70's. These contain Toko 10mm IFT's and that's where I got some to use in my Theremin...
Some of the Chinese radio kits use 7mm types if that is important to you.

Andy

Station X · 30th Apr 2018, 2:13 pm

You're welcome to this "chassis" for the cost of the postage, approximately £3. It's about 15" long.

Sorry about the poor pictures, but it's to wet to photograph it outside today.

PM me if interested.

kellys_eye · 30th Apr 2018, 6:54 pm

Access to 'dumped' equipment isn't a real possibility for me given my remote location so any parts I try for will inevitably be from an auction site or snapped up if offered via the forum (thanks Graham).

Fidelity? Not a name I've come across but one I'll be searching for, thanks for the tip.

30th Apr 2018, 8:25 am	#1
kellys_eye Octode Join Date: Jan 2014 Location: Oban, Scotland, UK. Posts: 1,129	Parts donor - receiver? I want to experiment with some simple radio reception circuits (superhet) using discrete components and 'proper' tuned circuits. I'm referring to the miniature IFTs with the red/white/yellow tuned cores. Since IFT's aren't that easy to come by I was hoping to use an old transistor radio as a 'parter' - there have to be dozens that could fit the bill and not grate on ones conscience for dismantling in such a way. Can anyone recommend a make/model of set that would provide me with such parts and that wouldn't cause cardiac arrest in the community for the horror I'm about to comit Ideally the make/model would be common such that if I wanted to duplicate any construction then I'd be able to (re)access additional parts in the same way.

30th Apr 2018, 9:03 am	#2
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,902	Re: Parts donor - receiver? You could also get IFTs from the radio section of a dumped music centre or radiogram, which widens your range of availability. If you go for a Japanese built set rather than a Hong Kong or Chinese one, you may be able to find data on the IFTs in an archived Toko catalogue. If you fancy being really experimental, you could look for a 12kHz wide crystal filter on 1.4MHz and build an up-converter. Long and medium waves in one band with no gap. I've found these filters on amateur radio rally stalls in the past. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

30th Apr 2018, 9:17 am	#3
G8UWM-MildMartin Heptode Join Date: Jan 2004 Location: Stockport, Greater Manchester, UK. Posts: 827	Re: Parts donor - receiver? The common and cheap Chinese radio kits (HX108, S66E etc.) contain those IFTs and would save the trouble of de-soldering. (IFTs are not the easiest things to remove.) Last edited by G8UWM-MildMartin; 30th Apr 2018 at 9:19 am. Reason: remove confusion

30th Apr 2018, 9:38 am	#4
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,902	Re: Parts donor - receiver? Hold can, pull gently, play small blowtorch on reverse side of PCB. It all depends on what you want to keep. david __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

30th Apr 2018, 10:04 am	#5
radioman Heptode Join Date: Apr 2003 Location: Ayr, Ayrshire, UK. Posts: 631	Re: Parts donor - receiver? I'd recommend looking out for an old/rough-looking Fidelity set from the late 60's/early 70's. These contain Toko 10mm IFT's and that's where I got some to use in my Theremin... Some of the Chinese radio kits use 7mm types if that is important to you. Andy

30th Apr 2018, 2:13 pm	#6
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Parts donor - receiver? You're welcome to this "chassis" for the cost of the postage, approximately £3. It's about 15" long. Sorry about the poor pictures, but it's to wet to photograph it outside today. PM me if interested. Attached Thumbnails __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

30th Apr 2018, 6:54 pm	#7
kellys_eye Octode Join Date: Jan 2014 Location: Oban, Scotland, UK. Posts: 1,129	Re: Parts donor - receiver? Access to 'dumped' equipment isn't a real possibility for me given my remote location so any parts I try for will inevitably be from an auction site or snapped up if offered via the forum (thanks Graham). Fidelity? Not a name I've come across but one I'll be searching for, thanks for the tip.