Single Triode MW Regen RX - UK Vintage Radio Repair and Restoration Discussion Forum

boiss · 18th Aug 2023, 10:50 pm

Does anyone have a circuit for a 1 valve (Triode) MW regenerative Receiver, This would be followed by a modern IC Audio amp? Open Tuning coil preferred with external Antenna.
Cheers
Mike

John M0GLN · 19th Aug 2023, 6:38 am

There's this one, all details on the website below.

http://www.antiqueradio.com/Jun04_En...rossley50.html

and it does work as I have one at home, not home made but the commercial version as shown on the website, I wouldn't use a 01-A triode though, quite scarce and the two I have are very microphonic.

John

John M0GLN · 19th Aug 2023, 7:11 am

Just found the power supply and amp' I made for the above Crosley 50, the IC is a LM386L. The batteries are just what I had, no particular reason for the different makes.

John

Jez1234 · 19th Aug 2023, 3:09 pm

If you go to www.worldradiohistory.com and look at old magazines such as Practical Wireless (and many others!) from the 1930's to the 1960's you will find loads of designs.

G6Tanuki · 19th Aug 2023, 3:26 pm

Somewhere I have a circuit for a 1 valve broadcast band receiver that used an Acorn triode valve, and could be built either to be powered by AC mains or dry batteries depending on the Acorn used.

Will see if I can work out where the diagram is..

I never actually built it, having decided that a short wave receiver based on a 1S5 pentode would be a better use of my efforts.

boiss · 19th Aug 2023, 5:29 pm

Quote:

Originally Posted by John M0GLN

There's this one, all details on the website below.

http://www.antiqueradio.com/Jun04_En...rossley50.html

and it does work as I have one at home, not home made but the commercial version as shown on the website, I wouldn't use a 01-A triode though, quite scarce and the two I have are very microphonic.

John

Hi John,
That looks just the ticket with a few great ideas to start with. the tuning cap idea is interesting too. I wouldn't use an 01-A triode, I have another wee beastie in mind, and it will run off the mains.
Thanks V. much.
Mike

boiss · 19th Aug 2023, 5:40 pm

Quote:

Originally Posted by Jez1234

If you go to www.worldradiohistory.com and look at old magazines such as Practical Wireless (and many others!) from the 1930's to the 1960's you will find loads of designs.

Hi Jez,
Some great stuff, definitely an almost endless supply of material for those baking hot summer afternoons here. I might even try a single transistor super regen radio, I never did get one to work around 1960.
I will have a look at the early valve sets too for odd ideas.
Thanks a bunch
Mike

murphyv310 · 19th Aug 2023, 10:14 pm

Use a Rod Pentode. 1J24B you can get great results at 45v HT and 1.2v filaments. I've a two valve regen version that easily drives a speaker. Great fun but the lack of MW stations that play stuff I like I disappointing.

Jez1234 · 19th Aug 2023, 11:17 pm

Quote:

Originally Posted by boiss

Quote:

Originally Posted by Jez1234

If you go to www.worldradiohistory.com and look at old magazines such as Practical Wireless (and many others!) from the 1930's to the 1960's you will find loads of designs.

Hi Jez,
Some great stuff, definitely an almost endless supply of material for those baking hot summer afternoons here. I might even try a single transistor super regen radio, I never did get one to work around 1960.
I will have a look at the early valve sets too for odd ideas.
Thanks a bunch
Mike

Ah now I've kinda been there and done it with transistor superregens so valve ones are on my own list

boiss · 26th Aug 2023, 12:11 am

Quote:

Originally Posted by murphyv310

Use a Rod Pentode. 1J24B you can get great results at 45v HT and 1.2v filaments. I've a two valve regen version that easily drives a speaker. Great fun but the lack of MW stations that play stuff I like I disappointing.

The lack of Mw stations is a bit of a problem, here in Spain they are almost always talking, and the music is pretty crappy. Hence the pantry MW txs. Loads of N African stations after dusk. There are few LW stations here that are somewhat varied.
I have a Hacker but Fm only goes up to 101MHz and most of the English speaking chanels here are around 106/7 MHz. No I am not going to build an FM tx. ( I do have a 2C39, do they work on 30VHt? Connections would be crap!)

Trevor · 26th Aug 2023, 11:08 am

Can details of the rod pentode unit be posted a schematic and or pictures I have some but no idea on what to use them

boiss · 27th Aug 2023, 8:07 am

I remember an IF amp in Marconi airborne radars, they were smaller than these Russian ones, about 6mm dia and they had no top connection. All connections were at one end. While I worked on these radars for a few months, I don't remember any of the characteristics of these valves. I do however remember that the lifetime was a bit limited as I recall changing a few of them.

18th Aug 2023, 10:50 pm	#1
boiss Pentode Join Date: Jun 2006 Location: Malaga, Spain. Posts: 235	Single Triode MW Regen RX Does anyone have a circuit for a 1 valve (Triode) MW regenerative Receiver, This would be followed by a modern IC Audio amp? Open Tuning coil preferred with external Antenna. Cheers Mike

19th Aug 2023, 6:38 am	#2
John M0GLN Octode Join Date: Jan 2004 Location: Southport, Merseyside, UK. Posts: 1,156	Re: Single Triode MW Regen RX There's this one, all details on the website below. http://www.antiqueradio.com/Jun04_En...rossley50.html and it does work as I have one at home, not home made but the commercial version as shown on the website, I wouldn't use a 01-A triode though, quite scarce and the two I have are very microphonic. John

19th Aug 2023, 7:11 am	#3
John M0GLN Octode Join Date: Jan 2004 Location: Southport, Merseyside, UK. Posts: 1,156	Re: Single Triode MW Regen RX Just found the power supply and amp' I made for the above Crosley 50, the IC is a LM386L. The batteries are just what I had, no particular reason for the different makes. John Attached Thumbnails

19th Aug 2023, 3:09 pm	#4
Jez1234 Banned Join Date: Mar 2021 Location: Morpeth, Northumberland, UK. Posts: 936	Re: Single Triode MW Regen RX If you go to www.worldradiohistory.com and look at old magazines such as Practical Wireless (and many others!) from the 1930's to the 1960's you will find loads of designs.

19th Aug 2023, 3:26 pm	#5
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,010	Re: Single Triode MW Regen RX Somewhere I have a circuit for a 1 valve broadcast band receiver that used an Acorn triode valve, and could be built either to be powered by AC mains or dry batteries depending on the Acorn used. Will see if I can work out where the diagram is.. I never actually built it, having decided that a short wave receiver based on a 1S5 pentode would be a better use of my efforts. __________________ I'm the Operator of my Pocket Calculator. -Kraftwerk.

19th Aug 2023, 10:14 pm	#8
murphyv310 Dekatron Join Date: Sep 2006 Location: Kilmarnock, Ayrshire, UK. Posts: 5,422	Re: Single Triode MW Regen RX Use a Rod Pentode. 1J24B you can get great results at 45v HT and 1.2v filaments. I've a two valve regen version that easily drives a speaker. Great fun but the lack of MW stations that play stuff I like I disappointing. __________________ Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member

26th Aug 2023, 11:08 am	#11
Trevor Octode Join Date: Aug 2006 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 1,082	Re: Single Triode MW Regen RX Can details of the rod pentode unit be posted a schematic and or pictures I have some but no idea on what to use them

27th Aug 2023, 8:07 am	#12
boiss Pentode Join Date: Jun 2006 Location: Malaga, Spain. Posts: 235	Re: Single Triode MW Regen RX I remember an IF amp in Marconi airborne radars, they were smaller than these Russian ones, about 6mm dia and they had no top connection. All connections were at one end. While I worked on these radars for a few months, I don't remember any of the characteristics of these valves. I do however remember that the lifetime was a bit limited as I recall changing a few of them.