two screenshots from 'Call the Midwife'

"Dickie mint" wrote in message
...
On 12/03/2015 09:24, Y Dangle wrote:

Ah yes, I remember Test Card C; but was there a Test Card A and B too?


Yup!

See http://www.testcardcircle.org.uk/tchistory.html

Richard

Cheers Richard



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On 12/03/2015 16:02, Graham. wrote:

So the question for me is, was this generic testcard C regularly
transmitted at the time depicted in the programme?

Further reading

http://www.pembers.freeserve.co.uk/Test-Cards/index.html#405-Lines


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Mark
Please replace invalid and invalid with gmx and net to reply.

In article ,
says...

On Thu, 12 Mar 2015 03:28:30 +0000, Bill Wright
wrote:

https://dl.dropboxusercontent.com/u/...311_235524.jpg

https://dl.dropboxusercontent.com/u/...311_235608.jpg

Bill

Is that the right card for the period though?
The one I remember had "BBC" in black with the second B inside the
white C, making me wonder what bCbc stood for!

So the question for me is, was this generic testcard C regularly
transmitted at the time depicted in the programme?


No - but the Aurora converter referred to in an earlier post defaults to Test
Card C if the incoming (625-line) video is lost.

This is a screen shot from a Sony TV:

http://www.tech-retro.com/Aurora_Des...pedImage_4.jpg

Note the absence of either a BBC or ITA ident on the card.

The TV was almost certainly borrowed or hired from an enthusiast who would
have provided the Aurora with it. At less than £200 and about the size of a
pack of cards, it produces the same quality as the £250,000 plus converters
produced in the 60s which stood in 6' 19" racks ...

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Terry

On 12/03/2015 14:40, NY wrote:


But were there safety resistors to discharge the HT PSU capacitors and
the tube's capacitance reasonably quickly once the power was removed?

I remember working on some CRT based test equipment of that era. A
common fault was an open circuit discharge resistor!


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