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Old 16th Jan 2022, 12:13 pm   #1
TonyDuell
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Default Thorn-AEI Investigation Report No L.60

I recently got an interesting (?) bit of paperwork with some other electronic oddments.

It originates from the Thorn-AEI Application Laboratory and is entitled

'Investigation Report No L.60
The design of a stabilized switched 405/625 line scanning circuit using the 30P19/PL302 on Thorn-AEI 110 degree cathode ray tubes'

It's a total of 16 pages, including Design Considerations, Circuit Description, Circuit Diagram, Voltages, Waveforms, Components List, and Winding details of the line output transformer.

Is this a well-known document? If not, is it of interest. I am keeping the original, but can try to scan it if there is interest.
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Old 16th Jan 2022, 12:57 pm   #2
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Default Re: Thorn-AEI Investigation Report No L.60

I would guess that this dates from around 1962/3 probably relating to the first full dual standard chassis, the 850. The later models used the PL500/504 line output valve.
Interesting document. John.
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Old 16th Jan 2022, 2:11 pm   #3
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Default Re: Thorn-AEI Investigation Report No L.60

If my memory is correct, I do have some other applications lab reports from this company, but not this one.
I’d certainly be interested in reading it.
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Old 16th Jan 2022, 5:54 pm   #4
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Default Re: Thorn-AEI Investigation Report No L.60

You're right about the date, I forgot to mention it's 'countersigned' 18th May 1963.

I will try to get it scanned soon.
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Old 25th Jan 2022, 6:36 pm   #5
TonyDuell
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Default Re: Thorn-AEI Investigation Report No L.60

I have now scanned this document. I had to scan it in colour (there is some staining on the pages, actually the scan is more readable than the original) and my scanner software does not know how to produce small files. As a result it's about 14MBytes, far too large to post here.

However I am happy to send it out to anyone who wants it, please PM me with an e-mail address that will accept such files. I obviously have no claim to said document and am therefore happy for others to attempt to reduce the size, further distribute it, etc.
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Old 26th Jan 2022, 6:23 pm   #6
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Default Re: Thorn-AEI Investigation Report No L.60

Too big for my set up Tony but thanks for the effort! John.
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Old 26th Jan 2022, 6:37 pm   #7
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Default Re: Thorn-AEI Investigation Report No L.60

Quote:
Originally Posted by TonyDuell View Post
I have now scanned this document. I had to scan it in colour (there is some staining on the pages, actually the scan is more readable than the original) and my scanner software does not know how to produce small files. As a result it's about 14MBytes, far too large to post here.

However I am happy to send it out to anyone who wants it, please PM me with an e-mail address that will accept such files. I obviously have no claim to said document and am therefore happy for others to attempt to reduce the size, further distribute it, etc.
Excellent Tony
I'll send you a PM with my email address.
A nice bit of study for one evening
Thank you.
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Old 26th Jan 2022, 11:22 pm   #8
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Default Re: Thorn-AEI Investigation Report No L.60

PM sent,
It will be well worth reading, thank you.
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Old 27th Jan 2022, 8:51 am   #9
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Default Re: Thorn-AEI Investigation Report No L.60

Thank you, file received.
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Old 27th Jan 2022, 9:11 am   #10
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Default Re: Thorn-AEI Investigation Report No L.60

Hi Tony.

Please may you send me a copy. I have PM you. Thanks Bob
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Old 27th Jan 2022, 9:43 am   #11
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Default Re: Thorn-AEI Investigation Report No L.60

Hi Tony
Yes I'd like to see it please. PM sent.
My restoration of 850 chassis is in full flow now. Chassis on bench.
Thanks
Simon
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Old 27th Jan 2022, 7:18 pm   #12
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Default Re: Thorn-AEI Investigation Report No L.60

Thanks Tony for sending it to me.
As it happens this became relevant with my 850 efforts today.
The chassis is out and I find C92 has burst.
This is C10 in your Thorn document. 0.35U.
In 405 position.
The chassis had to come out to get to it.
Simon
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Old 27th Jan 2022, 7:24 pm   #13
TonyDuell
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Default Re: Thorn-AEI Investigation Report No L.60

I'm glad it's of use.

The line output transformer in your chassis looks somewhat similar to the one in the report as well.
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Old 27th Jan 2022, 9:16 pm   #14
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Default Re: Thorn-AEI Investigation Report No L.60

Hi Tony

Can I have a copy. I will send you a pm.
Thanks

Rod
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