Cooper Smith Amplifier - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Michael Maurice · 2nd Feb 2010, 12:16 pm

The reason for low resolution is that the system limits the size of the file

Send me a PM with your email address and I'll email it to you.

Ed_Dinning · 2nd Feb 2010, 8:42 pm

Hi Michael, the Prodigy circuit shows a single O/P sec, but the continuation of the article the following month has wiring details to the 5 pin plug, can you upload this?
I've been looking for the Bantam circuit but can't find it. This was possibly a stripped down version of the Prodigy and may be what Gonzini has.

Ed

Gonzini · 2nd Feb 2010, 9:32 pm

Just a heads up to say thanks for the help so far!
Michael has kindly passed on the scans he has of the Prodigy, that will gave me something to look at.
Run out of time to get it on the bench again today, maybe tomorrow....

PJL · 2nd Feb 2010, 10:13 pm

If you really want to work it out the best method is to use a low voltage AC transformer to inject some voltage into the primary then measure the secondaries to obtain the ratios.

Michael Maurice · 2nd Feb 2010, 10:28 pm

The book does show wiring with 5 pin plugs for the speakers.

I'm quite happy to scan the whole book and post on here but I'm a bit concerned about the resolution aspect.

I'll use Photoshop to convert to PDF and we'll go from there, otherwise I'll have to email it to you directly.

Gonzini · 3rd Feb 2010, 12:09 am

Good plan with the ratios, l'll have to have a read up with that one.

Wiring for the 5 pin sockets would be good as well if its same!

Michael Maurice · 3rd Feb 2010, 1:08 pm

I have scanned in the entire book except the rear cover.

I've put them in PDF format so as to get the highest resolution on the forum.

Michael Maurice · 3rd Feb 2010, 1:12 pm

And some more pages

Michael Maurice · 3rd Feb 2010, 1:23 pm

and yet more

Michael Maurice · 3rd Feb 2010, 1:47 pm

And the last pages.

I hope this is all ok for you all

Gonzini · 3rd Feb 2010, 7:26 pm

Blimey Miichael you've really gone for it!
Ive seen the speaker wiring on the sockets, that all ties in with what ive seen on this chassis.
l'll have a read though it all when i get home and check out the output TX and the wiring.
Many thanks again for all your help with this one!
Hopefully the next post will be news of a good result, though its does need recapping and making safe

jimmc101 · 3rd Feb 2010, 8:15 pm

If anyone's interested, there is a free program that will merge all these PDFs into a single multi-page file.
http://www.pdfsam.org/

Jim

2nd Feb 2010, 12:16 pm	#21
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,222	Re: Cooper Smith Amplifier The reason for low resolution is that the system limits the size of the file Send me a PM with your email address and I'll email it to you.

2nd Feb 2010, 8:42 pm	#22
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: Cooper Smith Amplifier Hi Michael, the Prodigy circuit shows a single O/P sec, but the continuation of the article the following month has wiring details to the 5 pin plug, can you upload this? I've been looking for the Bantam circuit but can't find it. This was possibly a stripped down version of the Prodigy and may be what Gonzini has. Ed

2nd Feb 2010, 9:32 pm	#23
Gonzini Retired Dormant Member Join Date: Dec 2006 Location: Wickham, Hampshire, UK. Posts: 107	Re: Cooper Smith Amplifier Just a heads up to say thanks for the help so far! Michael has kindly passed on the scans he has of the Prodigy, that will gave me something to look at. Run out of time to get it on the bench again today, maybe tomorrow....

2nd Feb 2010, 10:13 pm	#24
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Cooper Smith Amplifier If you really want to work it out the best method is to use a low voltage AC transformer to inject some voltage into the primary then measure the secondaries to obtain the ratios.

2nd Feb 2010, 10:28 pm	#25
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,222	Re: Cooper Smith Amplifier The book does show wiring with 5 pin plugs for the speakers. I'm quite happy to scan the whole book and post on here but I'm a bit concerned about the resolution aspect. I'll use Photoshop to convert to PDF and we'll go from there, otherwise I'll have to email it to you directly.

3rd Feb 2010, 12:09 am	#26
Gonzini Retired Dormant Member Join Date: Dec 2006 Location: Wickham, Hampshire, UK. Posts: 107	Re: Cooper Smith Amplifier Good plan with the ratios, l'll have to have a read up with that one. Wiring for the 5 pin sockets would be good as well if its same!

3rd Feb 2010, 7:26 pm	#31
Gonzini Retired Dormant Member Join Date: Dec 2006 Location: Wickham, Hampshire, UK. Posts: 107	Re: Cooper Smith Amplifier Blimey Miichael you've really gone for it! Ive seen the speaker wiring on the sockets, that all ties in with what ive seen on this chassis. l'll have a read though it all when i get home and check out the output TX and the wiring. Many thanks again for all your help with this one! Hopefully the next post will be news of a good result, though its does need recapping and making safe

3rd Feb 2010, 8:15 pm	#32
jimmc101 Heptode Join Date: Mar 2009 Location: Portsmouth, Hampshire, UK. Posts: 674	Re: Cooper Smith Amplifier If anyone's interested, there is a free program that will merge all these PDFs into a single multi-page file. http://www.pdfsam.org/ Jim