Fm Valve circuit anyone? - UK Vintage Radio Repair and Restoration Discussion Forum

sg4instruments · 21st May 2009, 10:04 am

Hello,

I am trying to find a dedicated FM valve radio circuit that I can build. My wife listens to that band quite a lot so I thought I would attempt to build one. However, a quick search of the interent seems produce few possibilities.

Any ideas?

Carl

GMB · 21st May 2009, 10:26 am

The JasonKit tuner might be one to try since it is by definition suitable for home building.

I have a circuit for it somewhere, I'll have a look.

It will be a bit like the JVT2, which you will find on my web site: http://home.btconnect.com/gmb/
But the JVT2 uses the special tuner which would be a bit hard to source I think.

ParcGwyn · 21st May 2009, 1:08 pm

This chap has some pulse counting demodulator designs and also some regen designs.:

http://www.users.bigpond.com/cool386/index.html

I also have a wireless world design and a pw design (both pulse countng) that I can scan and e-mail if you are interested.

Regards

Dave (GW7ONS)

www.parcgwyn.talktalk.net

sg4instruments · 21st May 2009, 5:17 pm

Many thanks indeed. I look forward to that circuit then GMB. I had a look at the JVT2 and that seems just about right, other than the reservation you mentioned about the tuner.

I would also like to have a look at those wireless wolrd designs you mentioned ParcGwyn, just so that I can have a few designs to choose from or perhapps mix and match a little.

Much appreciated!

ParcGwyn · 22nd May 2009, 12:16 pm

I have managed to find the old magazines, unfortunately my memory was playing up and the Wireless World design is solid state but the PW design is valve I will scan the article this weekend and email you.

Regards

Dave (GW7ONS)

www.parcgwyn.talktalk.net

GMB · 22nd May 2009, 10:47 pm

Quote:

Many thanks indeed. I look forward to that circuit then GMB.

I'm afraid you will have to wait a while. I have just had a major disaster - my primary PC just dropped dead and the backup PC isn't working that well either.

sg4instruments · 25th May 2009, 12:45 pm

Thanks very much for your input, very helpfull indeed!

GMB · 4th Jun 2009, 9:48 pm

OK, I have scanned the manual for the other kit tuner.
You can find it on my web site: http://home.btconnect.com/gmb/ under "FM Tuner Kit".

The snag is of course that it does make use of commercial parts including, yet again, a packaged front end.

Of course I do have one of these so I can supply further reverse-engineered data if required.

murphyv310 · 5th Jun 2009, 8:08 pm

Hi.
How about a super regen circuit using Acorns, great fun but not so "wife" friendly.
Trevor

Ed_Dinning · 5th Jun 2009, 9:28 pm

Hi Carl, if you havent got what you need yet there were several designs for valve FM tuners in Radio Constructor in the 50's and 60's. These included details of the popular kits then available.
I think there was also a high spec desig published in Electronic Engineering in the same timeframe.

Ed

21st May 2009, 10:04 am	#1
sg4instruments Retired Dormant Member Join Date: Aug 2007 Location: Plymouth, Devon, UK. Posts: 13	Fm Valve circuit anyone? Hello, I am trying to find a dedicated FM valve radio circuit that I can build. My wife listens to that band quite a lot so I thought I would attempt to build one. However, a quick search of the interent seems produce few possibilities. Any ideas? Carl

21st May 2009, 10:26 am	#2
GMB Dekatron Join Date: Aug 2003 Location: near Reading (and sometimes Torquay) Posts: 3,099	Re: Fm Valve circuit anyone? The JasonKit tuner might be one to try since it is by definition suitable for home building. I have a circuit for it somewhere, I'll have a look. It will be a bit like the JVT2, which you will find on my web site: http://home.btconnect.com/gmb/ But the JVT2 uses the special tuner which would be a bit hard to source I think.

21st May 2009, 1:08 pm	#3
ParcGwyn Hexode Join Date: Jun 2005 Location: Aberystwyth, Wales, UK. Posts: 358	Re: Fm Valve circuit anyone? This chap has some pulse counting demodulator designs and also some regen designs.: http://www.users.bigpond.com/cool386/index.html I also have a wireless world design and a pw design (both pulse countng) that I can scan and e-mail if you are interested. Regards Dave (GW7ONS) www.parcgwyn.talktalk.net

21st May 2009, 5:17 pm	#4
sg4instruments Retired Dormant Member Join Date: Aug 2007 Location: Plymouth, Devon, UK. Posts: 13	Re: Fm Valve circuit anyone? Many thanks indeed. I look forward to that circuit then GMB. I had a look at the JVT2 and that seems just about right, other than the reservation you mentioned about the tuner. I would also like to have a look at those wireless wolrd designs you mentioned ParcGwyn, just so that I can have a few designs to choose from or perhapps mix and match a little. Much appreciated!

22nd May 2009, 12:16 pm	#5
ParcGwyn Hexode Join Date: Jun 2005 Location: Aberystwyth, Wales, UK. Posts: 358	Re: Fm Valve circuit anyone? I have managed to find the old magazines, unfortunately my memory was playing up and the Wireless World design is solid state but the PW design is valve I will scan the article this weekend and email you. Regards Dave (GW7ONS) www.parcgwyn.talktalk.net

25th May 2009, 12:45 pm	#7
sg4instruments Retired Dormant Member Join Date: Aug 2007 Location: Plymouth, Devon, UK. Posts: 13	Re: Fm Valve circuit anyone? Thanks very much for your input, very helpfull indeed!

4th Jun 2009, 9:48 pm	#8
GMB Dekatron Join Date: Aug 2003 Location: near Reading (and sometimes Torquay) Posts: 3,099	Re: Fm Valve circuit anyone? OK, I have scanned the manual for the other kit tuner. You can find it on my web site: http://home.btconnect.com/gmb/ under "FM Tuner Kit". The snag is of course that it does make use of commercial parts including, yet again, a packaged front end. Of course I do have one of these so I can supply further reverse-engineered data if required.

5th Jun 2009, 8:08 pm	#9
murphyv310 Dekatron Join Date: Sep 2006 Location: Kilmarnock, Ayrshire, UK. Posts: 5,422	Re: Fm Valve circuit anyone? Hi. How about a super regen circuit using Acorns, great fun but not so "wife" friendly. Trevor __________________ Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member

5th Jun 2009, 9:28 pm	#10
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,195	Re: Fm Valve circuit anyone? Hi Carl, if you havent got what you need yet there were several designs for valve FM tuners in Radio Constructor in the 50's and 60's. These included details of the popular kits then available. I think there was also a high spec desig published in Electronic Engineering in the same timeframe. Ed