New here, just wanting to share something I built. - UK Vintage Radio Repair and Restoration Discussion Forum

geo_VE3GZB · 29th Nov 2008, 10:28 pm

I'm from Canada, got my amateur license recently.

I'd been working on trying to build my station 1920s/30s style. This is the receiver I've built. I'm using Cossor battery-powered valves in it and I've been enjoying quite impressive performance, receiving commercial broadcasts from Taiwan and Russia here in Canada on it!

(The following links are on my home computer/server, it gets shut off during the night and turned on again during day time - GMT-5 my locale - so if the links to photos don't work, please try again.)

(general link, access to all of the project files)
http://99.239.146.96/Projects/Miniloop_radio/

(basic schematic)
http://99.239.146.96/Projects/Minilo...o/Miniloop.png

(specific photo links to the set)
http://99.239.146.96/Projects/Minilo...iloop_V3_1.JPG

http://99.239.146.96/Projects/Minilo...iloop_V3_2.JPG

http://99.239.146.96/Projects/Minilo...iloop_V3_3.JPG

The "Battery Eliminator" provides 5VDC and 100VDC output, overload protected and very well filtered. I built it out of scraps.

http://99.239.146.96/Projects/Minilo...nator/BE_1.JPG

http://99.239.146.96/Projects/Minilo...nator/BE_2.JPG

http://99.239.146.96/Projects/Minilo...nator/BE_3.JPG

(how I made the variocouplers out of scrap cardboard tubing and molten wax, I made two - one to experiment with, the other to use in final build)

http://99.239.146.96/Projects/Ham_co...iocoupler1.JPG

http://99.239.146.96/Projects/Ham_co...iocoupler2.JPG

http://99.239.146.96/Projects/Ham_co...iocoupler3.JPG

(the basic loop structure and loop resonator completed, again sealed with molten wax)

http://99.239.146.96/Projects/Ham_co.../Miniloop1.JPG

geo_VE3GZB · 30th Nov 2008, 2:15 am

PS: I neglected to mention that my CAD program displays only two American valves, 6AQ5 and 12AX7. I used those in drawing the schematic. So the displayed pin numbers will not match the Cossor valves.

Norm_N_Tam · 7th Dec 2008, 3:22 am

I'm disappointed that no one else has responded here, but I really like the circuit Geo came up with using Cossor valves. I have a couple of 210s I bought on ebay and perhaps I can find a 215SG so I can build a similar radio. I have been wanting to build a radio using British valves myself. I've just been waiting for the right circuit to come along. I also have HL2s, PM2s and PM1s to use in other radios. Perhaps, I'll also build a one valve radio with a HL2. Bob Wilson has a nice one valve radio plan in his ebook.

Norman

dave walsh · 7th Dec 2008, 12:01 pm

Not seen this previously Norman-still haven't as I can't seem to get it to download! Combined with [perhaps] less pre-xmas activity on site this might be an explanation! Cheers Dave W

jim_jobe · 7th Dec 2008, 12:31 pm

I can't get them to download either - they all just timeout VE3GZB,
Jim

jim_jobe · 7th Dec 2008, 12:34 pm

This is weird - I just tried again and they all download perfectly now. What is happening here

I've just started building up a stock of old valves too with the same aim in mind so many thanks VE3GZB,
73,
Jim

jim_jobe · 7th Dec 2008, 12:38 pm

Problem solved after re-reading your original post! You must have just switched your computer back on!!!
Jim

Mike Phelan · 7th Dec 2008, 12:45 pm

Geo - you need to post the graphics in the accepted way using attachments - have a look in FAQs above.
The problem is that the links on the PC you are using is probably closed down at night - when we are all up and about here! It's better is we can see the thumbnails rather than having to trawl through links, as well.
Thanks

jim_jobe · 7th Dec 2008, 1:46 pm

Geo,
I've taken the liberty of putting in a couple of connection "blobs". Nice interesting circuit - this is what Vintage Radio is all about! What's the story behind L3 and L4?
Jim

Mike Phelan · 8th Dec 2008, 9:10 am

I'm closing this thread now, folks, as it mainly consists of the problems with links to images that we cannot see.

We'll look forward to seeing a new thread using the normal attachment system.

29th Nov 2008, 10:28 pm	#1
geo_VE3GZB Retired Dormant Member Join Date: Nov 2008 Location: Grand Valley, Ontario, Canada Posts: 8	New here, just wanting to share something I built. I'm from Canada, got my amateur license recently. I'd been working on trying to build my station 1920s/30s style. This is the receiver I've built. I'm using Cossor battery-powered valves in it and I've been enjoying quite impressive performance, receiving commercial broadcasts from Taiwan and Russia here in Canada on it! (The following links are on my home computer/server, it gets shut off during the night and turned on again during day time - GMT-5 my locale - so if the links to photos don't work, please try again.) (general link, access to all of the project files) http://99.239.146.96/Projects/Miniloop_radio/ (basic schematic) http://99.239.146.96/Projects/Minilo...o/Miniloop.png (specific photo links to the set) http://99.239.146.96/Projects/Minilo...iloop_V3_1.JPG http://99.239.146.96/Projects/Minilo...iloop_V3_2.JPG http://99.239.146.96/Projects/Minilo...iloop_V3_3.JPG The "Battery Eliminator" provides 5VDC and 100VDC output, overload protected and very well filtered. I built it out of scraps. http://99.239.146.96/Projects/Minilo...nator/BE_1.JPG http://99.239.146.96/Projects/Minilo...nator/BE_2.JPG http://99.239.146.96/Projects/Minilo...nator/BE_3.JPG (how I made the variocouplers out of scrap cardboard tubing and molten wax, I made two - one to experiment with, the other to use in final build) http://99.239.146.96/Projects/Ham_co...iocoupler1.JPG http://99.239.146.96/Projects/Ham_co...iocoupler2.JPG http://99.239.146.96/Projects/Ham_co...iocoupler3.JPG (the basic loop structure and loop resonator completed, again sealed with molten wax) http://99.239.146.96/Projects/Ham_co.../Miniloop1.JPG

30th Nov 2008, 2:15 am	#2
geo_VE3GZB Retired Dormant Member Join Date: Nov 2008 Location: Grand Valley, Ontario, Canada Posts: 8	Re: New here, just wanting to share something I built. PS: I neglected to mention that my CAD program displays only two American valves, 6AQ5 and 12AX7. I used those in drawing the schematic. So the displayed pin numbers will not match the Cossor valves.

7th Dec 2008, 3:22 am	#3
Norm_N_Tam Triode Join Date: Feb 2007 Location: Wiles-Barre, PA USA Posts: 34	Re: New here, just wanting to share something I built. I'm disappointed that no one else has responded here, but I really like the circuit Geo came up with using Cossor valves. I have a couple of 210s I bought on ebay and perhaps I can find a 215SG so I can build a similar radio. I have been wanting to build a radio using British valves myself. I've just been waiting for the right circuit to come along. I also have HL2s, PM2s and PM1s to use in other radios. Perhaps, I'll also build a one valve radio with a HL2. Bob Wilson has a nice one valve radio plan in his ebook. Norman

7th Dec 2008, 12:01 pm	#4
dave walsh Dekatron Join Date: Jan 2006 Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex. Posts: 5,817	Re: New here, just wanting to share something I built. Not seen this previously Norman-still haven't as I can't seem to get it to download! Combined with [perhaps] less pre-xmas activity on site this might be an explanation! Cheers Dave W

7th Dec 2008, 12:31 pm	#5
jim_jobe Heptode Join Date: Nov 2004 Location: Ripon, N.Yorkshire, UK. Posts: 782	Re: New here, just wanting to share something I built. I can't get them to download either - they all just timeout VE3GZB, Jim

7th Dec 2008, 12:34 pm	#6
jim_jobe Heptode Join Date: Nov 2004 Location: Ripon, N.Yorkshire, UK. Posts: 782	Re: New here, just wanting to share something I built. This is weird - I just tried again and they all download perfectly now. What is happening here I've just started building up a stock of old valves too with the same aim in mind so many thanks VE3GZB, 73, Jim

7th Dec 2008, 12:38 pm	#7
jim_jobe Heptode Join Date: Nov 2004 Location: Ripon, N.Yorkshire, UK. Posts: 782	Re: New here, just wanting to share something I built. Problem solved after re-reading your original post! You must have just switched your computer back on!!! Jim

7th Dec 2008, 12:45 pm	#8
Mike Phelan Dekatron Join Date: Nov 2003 Location: Near Leeds, West Yorkshire, UK Posts: 4,609	Re: New here, just wanting to share something I built. Geo - you need to post the graphics in the accepted way using attachments - have a look in FAQs above. The problem is that the links on the PC you are using is probably closed down at night - when we are all up and about here! It's better is we can see the thumbnails rather than having to trawl through links, as well. Thanks __________________ Mike. Last edited by Mike Phelan; 7th Dec 2008 at 5:05 pm. Reason: Mea culpa - wrong poster!!

7th Dec 2008, 1:46 pm	#9
jim_jobe Heptode Join Date: Nov 2004 Location: Ripon, N.Yorkshire, UK. Posts: 782	Re: New here, just wanting to share something I built. Geo, I've taken the liberty of putting in a couple of connection "blobs". Nice interesting circuit - this is what Vintage Radio is all about! What's the story behind L3 and L4? Jim Attached Thumbnails

8th Dec 2008, 9:10 am	#10
Mike Phelan Dekatron Join Date: Nov 2003 Location: Near Leeds, West Yorkshire, UK Posts: 4,609	Re: New here, just wanting to share something I built. I'm closing this thread now, folks, as it mainly consists of the problems with links to images that we cannot see. We'll look forward to seeing a new thread using the normal attachment system. __________________ Mike.