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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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20th May 2018, 1:30 pm | #1 |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Head amp for a vidicon
Hi, I have been working on a Vidicon camera. I got to the stage of getting some simple hand waving images up in front of it but my RCA head amp died, and I am wanting a schematic for a head amp for it to make my own. I have a few head amp circuits I have used on a PMT camera, but i am not sure this is good enough for a weaker vidicon signal. Well I think its weaker, the PMT gives a nice signal right out of it. Has anyone got something handy I could have a look at.
http://www.taswegian.com/NBTV/forum/...=2564&start=30 |
21st May 2018, 9:37 pm | #2 |
Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,194
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Re: Head amp for a vidicon
Hi, somewhere on the web are details of the PTV vidicon camera which had a simple mosfet circuit as a head amp.
There was also one in the Mullard educational series of publications PM me if you have no luck and I'll see what I can find Ed |
21st May 2018, 10:40 pm | #3 |
Dekatron
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
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Re: Head amp for a vidicon
Seems it's normal practise is feed the target signal into a cathode follower, emitter follower or source follower.
From the TV camera museum: http://www.tvcameramuseum.org/pdfs/p...rcuittvc1a.pdf It's likely you have visited this site. DFWB. |
21st May 2018, 11:28 pm | #4 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Head amp for a vidicon
The last time I worked with vidicon/nuvicon tube cameras they had 3 long tailed pairs of fets mounted close up around the edge of the lens.
If we are lucky I might have a circuit diagram but if not I might have an old board for reverse engineering. |
22nd May 2018, 12:55 pm | #5 | |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: Head amp for a vidicon
Quote:
http://www.taswegian.com/NBTV/forum/...&hilit=saticon |
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22nd May 2018, 1:12 pm | #6 | |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: Head amp for a vidicon
Quote:
which i manged to get up to 64 line reflection flying spot camera images shown here some tests me in there some where towards the bottom in one of the tests i think i for got the flip the images so some upside down like my son in the below one https://www.youtube.com/watch?v=Bngl5qvgwaY https://www.youtube.com/user/039dale...y=flying+spot+ I also like to try in the future a sstv version classic 8 seconds 120 line and perhaps a vidicon saticon version ..the are interesting things ! Last edited by dalekmoore2007; 22nd May 2018 at 1:20 pm. |
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22nd May 2018, 2:34 pm | #7 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Head amp for a vidicon
That is a very early camera.
The stuff I have got is a bit more modern and components were getting more affordable. I have dug out a couple of photos from my hard drive. There is one with the resistors laid flat to squeeze it in behind a big lens and another that has been suffering with a treatable case of blue tantitis. They should be easy to reverse engineer if I have not already got a diagram. |
22nd May 2018, 3:38 pm | #8 |
Rest in Peace
Join Date: Feb 2004
Location: Hexham, Northumberland, UK.
Posts: 2,234
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Re: Head amp for a vidicon
The last vidicon camera I repaired used a Nuvistor as the pre-amp. I think it was about 1984.
Alan. |
22nd May 2018, 6:23 pm | #9 |
Heptode
Join Date: Jan 2009
Location: West Lothian, UK.
Posts: 761
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Re: Head amp for a vidicon
Attached should be the video circuit from the Mullard Educational CCTV Camera project.
__________________
George |
23rd May 2018, 6:08 am | #10 | |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: Head amp for a vidicon
Quote:
Yes mines early 70s vintage for the deflection coils focus coil, the image tube i think is a bit later replacements for the early version of it . Did you make this image tube camera ? I would be interested in the head amp circuit if you could be bothered sketching up the circuit . I have some newer image tubes which i also plan the turn into cameras so trying different ideas on the head amp side to see what works best . Thanks for the photos tha's a idea i didn't think of for this camera ,i did mount a PMT head amp close to its output but didn't think of it here . |
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23rd May 2018, 6:19 am | #11 |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: Head amp for a vidicon
I have not heard of that one ! do you have the whole camera circuit just out of interest ? but thanks for the head amp video circuit part of it the transistor look to be easy to find a modern replacement ..this is a good one i wonder what tube it used ?
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23rd May 2018, 5:25 pm | #12 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Head amp for a vidicon
The camera I have been tinkering with was an old prototype that was given to me when the production model was discontinued.
It is like a bullet cam but more like a tank shell. |
24th May 2018, 1:53 am | #13 |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: Head amp for a vidicon
A B/W vidicon is very rare now to find here in Australia, in the early 1980's you could still get them ...then colour cameras started to come in.
I have not seen one like you have ! nice lens system on that beast ! |
24th May 2018, 4:50 am | #14 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Head amp for a vidicon
That lens needs to be taken apart and rebuilt. The glass elements have worked loose.
I have several lenses including a fully motorized one. |
24th May 2018, 7:56 am | #15 |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: Head amp for a vidicon
I am glad other people have a interest these...not easy to get them going without schematics, was yours working from the start ?
I tried the PMT circuit for a head amp from a few posts ago it was a no goer i tested a signal in and it was 4 times the signal without this thing so that was a waste of time i am sure its fine for a PMT but here its no good for what i need it to do. |
24th May 2018, 12:40 pm | #16 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Head amp for a vidicon
The bits I was given were a couple of prototype units with a later circuit diagram with the head amp shown as a block. I can't remember if I have a circuit diagram for the head amp but I do have a couple of broken ones and quite a few boards that were production rejects.
The bits I am short of are lens mounting brackets and scan coils. I have three sets of working boards with scan coils and only one good scan coil to lens mount. I could use a dead chassis with a C-mount thread on it. |
24th May 2018, 1:13 pm | #17 |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: Head amp for a vidicon
Yes the scanning deflection coils are harder to find ! even on ebay tons of old image tubes but your lucky if you ever find a deflection coil for them so having a few as you do is rare .
So you have a a few bits to same model Vidicon but not working getting it to work is a satisfying challenge ~! |
24th May 2018, 1:23 pm | #18 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Head amp for a vidicon
The mechanical parts are most likely less of a problem than getting scan coils but do come a close second for being difficult to get.
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26th May 2018, 10:47 am | #19 |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: Head amp for a vidicon
I noticed labguy has a design for he;s tiny IKE camera
http://labguysworld.com/IconoscopeCameraProject_007.htm So i am giving this a go ,i finished it but have to add the transistors to the transistor sockets /. |