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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment. |
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Thread Tools |
10th Sep 2014, 9:06 am | #1 |
Tetrode
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
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Anita MK8 calculator
Hello everyone,
For those who likes it a few pics and a movie from my Anita MK8 calculator. I tried to contact ALANS ANITAS / Alan Chapman but he does not respond. Does anyone know about him? I got my machine from a former Sumlock Anita service man. He gave me several tips to restore the machine. And I made a few tools for the machine to work on it. And a little youtube demonstration... http://www.youtube.com/watch?v=6-qvtiqWens Regards Roland |
10th Sep 2014, 10:20 am | #2 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
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Re: Anita MK8 calculator
ALANS ANITAS hasn't visited the forums since July last year. Have you tried emailing him via the forums?
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
10th Sep 2014, 10:36 am | #3 |
Rest in Peace
Join Date: Apr 2012
Location: West London, UK.
Posts: 665
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Re: Anita MK8 calculator
Hi Roland, Alan does have his own website and provides an email address there:-
www.alansanitas.co.uk Nice pictures of your Anita - Thanks Years back I used to use a Monroematic, which is a far more clunkety bonk device than the Anita. Regards -Mike |
12th Sep 2014, 6:11 pm | #4 |
Hexode
Join Date: Dec 2005
Location: Nr. York, North Yorkshire, UK.
Posts: 348
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Re: Anita MK8 calculator
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12th Sep 2014, 8:37 pm | #5 |
Tetrode
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
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Re: Anita MK8 calculator
Hello,
Thanks for the replies! Really sad to hear Alan is not with us any more. I hope all other people enjoy the pics and movie of the Anita MK8. Regards, Roland |
12th Sep 2014, 8:47 pm | #6 |
Hexode
Join Date: Mar 2009
Location: Worthing, Sussex, UK.
Posts: 277
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Re: Anita MK8 calculator
I must get round to my Mk8 which is untouched after 30 years in a loft. Did you change all of the 18 meg resistors and the selenium 'diodes'? I read somewhere also that the tritium in the thyratrons will have decayed to the point where it no longer does anything. Clearly this isn't the case with your machine Roland.
Very sad news about Alan. Ging |
12th Sep 2014, 10:02 pm | #7 |
Tetrode
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
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Re: Anita MK8 calculator
Hello Ging,
All the 19/20M resistors are replaced by 18M indeed. Also some power resistors were drifted miles away in value and were replaced. All paper caps were bad. Some doubled in value and had a big leaking current, others just oc. Mains caps were oc and a few bad selenium diodes were replaced. (A friend made new sides for my electrolytics) There is no tritium used in the Anita trigger tubes. Tritium is used in trigger tubes without a night light. Both have the same purpose to make a accurate ignition level. My Anita has been in not electronic friendly environments the last years. I've cleaned all rotary switches and lubricated the keylines. And here is a picture of all the components I've replaced... I've learned a lot about Anita's from the former service man And he hasn't seen a machine working for more than 40 years So he really enjoyed to see this machine came back to live again! Regards, Roland |