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26th Feb 2011, 10:03 pm | #1 |
Retired Dormant Member
Join Date: Mar 2010
Location: Carlisle, UK.
Posts: 164
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fm valve receiver circuit anyone got a good one.
I'll freely admit im to thick to design a radio circuit but im looking to construct something with a few valves in it to pick up fm , not overly complicated using as much scrap rubbish im likely to have laying round as possible please .
would really like something that uses as old a valve type as possible ( im funny like that ). i have access to plenty of 40's and 50's valves . any help greatly appreciated. |
26th Feb 2011, 10:33 pm | #2 |
Dekatron
Join Date: Jul 2008
Location: Charmouth, Dorset, UK.
Posts: 3,601
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Re: fm valve reciever circuit anyone got a good one.
The Jason FM tuner of the '50s is pretty simple, I'm sure someone on here has got a circuit for it.
Peter |
26th Feb 2011, 10:39 pm | #3 |
Rest in Peace
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Re: fm valve reciever circuit anyone got a good one.
I was going to suggest the Jason too, uses 4 EF91s and works well, see here:-
https://www.vintage-radio.net/forum/...ighlight=jason Regards, Mick. |
26th Feb 2011, 10:40 pm | #4 |
Retired Dormant Member
Join Date: May 2009
Location: Norwich, Norfolk, UK.
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Re: fm valve reciever circuit anyone got a good one.
Hi,
I have just rebuilt a Jason tuner, the circuit is available from the service data at the top of the page. The MK1 earlier one uses EF91s and the later MK2 and 3 use EF80s. I rebuilt a MK3 as a MK2 and am very impressed with the results. Regards, Rob |
26th Feb 2011, 10:42 pm | #5 |
Octode
Join Date: Jan 2011
Location: Southwell, Nottinghamshire, UK.
Posts: 1,781
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Re: fm valve reciever circuit anyone got a good one.
This one is very recent and may not be old enough for you but I have from Short wave magazine August 1995 2 valve VHF receiver. Uses 2 x ECC 86's.
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27th Feb 2011, 3:32 am | #6 |
Retired Dormant Member
Join Date: Mar 2010
Location: Carlisle, UK.
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Re: fm valve receiver circuit anyone got a good one.
hmmm i asked for a radio not a tuner and although im called jason a tuners not what i want to build this two valve vhf effort sounds like it might be the one though I could fancy something with a couple more valves and a decent outut stage .
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27th Feb 2011, 9:44 am | #7 |
Dekatron
Join Date: Jul 2008
Location: Charmouth, Dorset, UK.
Posts: 3,601
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Re: fm valve receiver circuit anyone got a good one.
It wouldn't be difficult to add an audio section to the aforementioned tuner.
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27th Feb 2011, 10:48 am | #8 |
Dekatron
Join Date: Nov 2003
Location: Near Leeds, West Yorkshire, UK
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Re: fm valve receiver circuit anyone got a good one.
As others said. Making an FM front end from scratch is not an easy thing to do.
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Mike. |
27th Feb 2011, 11:10 am | #9 |
Octode
Join Date: Jan 2011
Location: Southwell, Nottinghamshire, UK.
Posts: 1,781
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Re: fm valve receiver circuit anyone got a good one.
The two valve I mentioned is a radio with LS output and is intended for 115 to 185 Mhz and is optimised to reduce any RF radiation rather than sensitivity.
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27th Feb 2011, 11:29 am | #10 |
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Re: fm valve receiver circuit anyone got a good one.
There's a couple of designs in the 18th edition of Practical Wireless Circuits.
I could scan them. Alan |
27th Feb 2011, 11:55 am | #11 |
Pentode
Join Date: Oct 2006
Location: Brackley Northamptonshire, UK.
Posts: 240
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Re: fm valve receiver circuit anyone got a good one.
There was a complete FM radio in a PW constructional article some 50 odd years ago.
I am pretty sure it was Jan/Feb/Mar 1960. This used a few EF91 in the RF stages (4?) and a couple of PP EL91, I think, in the AF Output. I know I have the first two articles in the loft but don't have the final part. I remember the Feb edition, for definate, as it also had the 6K7 superhet in it which others may remember. I'm sure it had a magic Eye as well. A nice straightforward little set which I had intended to make.......... one day.. Failing that I have a service manual for my Dynatron Ether Minstrell which is switch tuned FM only with lots of old fifties EF80s and PP EL84s in the output. Eleven valves in total, Foster Sealey discriminator and would be reasonably straightforward to copy if you have the expertise. HTH Denis
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If you take something apart often enough, eventually you'll have two of them.... |
27th Feb 2011, 12:03 pm | #12 |
Octode
Join Date: Jan 2011
Location: Southwell, Nottinghamshire, UK.
Posts: 1,781
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Re: fm valve receiver circuit anyone got a good one.
If you look here
http://vintageradio.me.uk/radconnav/valvetrf/ and scoll down a little to Acorn VHF Superregen: 954 DET20: A.Sydenham June 1964. |
27th Feb 2011, 3:38 pm | #13 |
Rest in Peace
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Re: fm valve receiver circuit anyone got a good one.
Unless the VHF superregen included an RF stage you might annoy your neighbours by spraying noise over the FM band near whatever station you are tuned to.
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27th Feb 2011, 5:47 pm | #14 |
Dekatron
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Location: Newcastle upon Tyne, Tyne & Wear, UK.
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Re: fm valve receiver circuit anyone got a good one.
Hi, for a good output stage add the Mullard 3-3 onto the Jason.
This amp has been the subject of fairly recent threads and the parts are easily available. Ed |
28th Feb 2011, 12:33 pm | #15 |
Octode
Join Date: Nov 2004
Location: Hebden Bridge, West Yorkshire, UK.
Posts: 1,885
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Re: fm valve receiver circuit anyone got a good one.
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1st Mar 2011, 1:49 am | #16 |
Dekatron
Join Date: Jul 2008
Location: Charmouth, Dorset, UK.
Posts: 3,601
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Re: fm valve receiver circuit anyone got a good one.
Now that is simple - and clever, I've never seen an EB91 used as an HT rectifier before though.
Peter |
1st Mar 2011, 8:48 pm | #17 |
Hexode
Join Date: Jun 2005
Location: Aberystwyth, Wales, UK.
Posts: 358
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Re: fm valve receiver circuit anyone got a good one.
I would be tempted to build a pulse counting fm receiver cool386 has some designs on his website. http://cool386.tripod.com/pcrx/pcrx.html
He also has an interesting 1 valve loudspeaker radio using a ECL84. Dave GW7ONS http://www.parcgwyn.talktalk.net |
1st Mar 2011, 11:03 pm | #18 |
Retired Dormant Member
Join Date: Mar 2010
Location: Carlisle, UK.
Posts: 164
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Re: fm valve receiver circuit anyone got a good one.
I think ill have a bit of a bash at that looks a nice design and different .
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2nd Mar 2011, 7:50 am | #19 |
Octode
Join Date: Aug 2006
Location: Stoke-on-Trent, Staffordshire, UK.
Posts: 1,082
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Re: fm valve receiver circuit anyone got a good one.
I am in the process of building a pulse count receiver its on the forum somewhere if you only want mono its good very good I have had mine working but it has been put on the back burner untill I get some more time
regardsTrev |