BBC (British Broadcasting Corporation)

[Lee_M]

Info on some of the BBC designed transformers.

 

[mjrippe]

Repeat Coils LL/238, LL/245, LL/252

 

[mjrippe]

Repeat coil

 

[mjrippe]

LL/256SP and AL/103SP

 

[Lee_M]

LL/106SU Repeating coil.

 

[Lee_M]

Revised version of the document from my first post.

Added a few new pages.

 

[Lee_M]

LG/95M.

This is in the doc from the first post, But since I've revised that doc and removed this page from it I thought I should post this up separately.

 

[Lee_M]

LL253/A

Same deal as the previous post.

 

[Lee_M]

Lots more BBC transformer info....Some specific, Some general.

File is too large to upload on here, So I've hosted it on my outlook OneDrive page.

Find it here;
http://1drv.ms/1Hsuj7L

 

[Lee_M]

Explanation of the letter system for BBC transformer models, Along with pin connection info for many types.

 

[bugbrand]

Don't know if this is the right way to post, or if this is already a well known source, but there's something of a motherload of BBC designs here::
http://www.bbceng.info/ti/eqpt/  [several gigs of PDFs]

 

[PRR]

Excellent.

If you don't know the BBC codes, this page may be a more useful starting point.

http://www.bbceng.info/ is the overall top page.

 

[mjrippe]

From docs posted by ln76d, converted to pdf

 

[Tubetec]

Ohhh excellent stuff ,I found that page years ago ,but had trouble finding it again ,theres some great circuits in there and plenty of inspiration for new designs too .

 

[Tubetec]

http://www.bbceng.info/ti/eqpt/AMC_2.pdf

Thats a real clever design that one ,been meaning to try something similar on one of my own .
The step by step breakdown of the workings in plain English really helps the understanding of it too , I had an old maths teacher years back who had initially worked for the BBC ,he rummaged around in his book shelf and found me some of those same schematics from a training manual . Theres a lot of jems there waiting to be reworked with modern components , a lot of the later BBC designs relied on tertiary feedback windings and specially wound transformers ,Canford used supply some of them uptil a few years ago to special order.

 

[mrclunk]

Might have a crack at the AMC, looks cool.

here's some circuits from the 70's.

AM9 19 mic amp

 

[gyraf]

AM6-17 Limiter

/Jakob E.

 

[Tubetec]

Cheers for that Jacob ,
Like all the Bee'B designs you find something new and unique in each one,

 

[gyraf]

BBC AM6-17 Limiter, slightly better resolution 1/2

 

[gyraf]

BBC AM6-17 Limiter, slightly better resolution 2/2