UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Computers

Notices

Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

Reply
 
Thread Tools
Old 19th Apr 2019, 7:35 am   #1
Argus25
Nonode
 
Argus25's Avatar
 
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,170
Default Vintage amber VDU project

Recently I built two vintage NOS Zenith amber CRT VDU's into special order Takachi enclosures. One thing was a successful CRT gasket/mask that was machined out of 10mm thick black acrylic. Using thicker acrylic this could also be a method to recreate masks for vintage CRT's too.

The article/story is here:

http://worldphaco.com/uploads/THE_AM...DU_PROJECT.pdf
Attached Thumbnails
Click image for larger version

Name:	amber1b.jpg
Views:	122
Size:	51.2 KB
ID:	181499   Click image for larger version

Name:	AMBER4.jpg
Views:	123
Size:	50.5 KB
ID:	181500   Click image for larger version

Name:	amber17.jpg
Views:	128
Size:	69.2 KB
ID:	181501  
Argus25 is offline   Reply With Quote
Old 19th Apr 2019, 8:24 am   #2
Kentode
Hexode
 
Kentode's Avatar
 
Join Date: Mar 2015
Location: Todmorden, West Yorkshire, UK.
Posts: 339
Default Re: Vintage amber VDU project

That's a very professional looking job, congratulations!

How did you arrive at the 700 mm radius of curvature of the crt?
__________________
Regards, Ken.

BVWS member
Kentode is offline   Reply With Quote
Old 19th Apr 2019, 8:40 am   #3
peter_scott
Nonode
 
peter_scott's Avatar
 
Join Date: May 2003
Location: Edinburgh, UK.
Posts: 2,006
Default Re: Vintage amber VDU project

As Ken has said, a truly professional job! Beautifully executed.

Peter
peter_scott is offline   Reply With Quote
Old 19th Apr 2019, 12:14 pm   #4
Argus25
Nonode
 
Argus25's Avatar
 
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,170
Default Re: Vintage amber VDU project

Quote:
Originally Posted by Kentode View Post
That's a very professional looking job, congratulations!

How did you arrive at the 700 mm radius of curvature of the crt?
I used a long string with a pen and drew curves on thin card, then cut them out and held them to the crt faceplate, in the end, through iteration, I found the radius of the faceplate.
Argus25 is offline   Reply With Quote
Old 19th Apr 2019, 1:35 pm   #5
Karen O
Heptode
 
Karen O's Avatar
 
Join Date: Jul 2011
Location: Bridgnorth, Shropshire, UK.
Posts: 503
Default Re: Vintage amber VDU project

That is REALLY nice!

Mounting 5.5" CRTs has been a real bugbear. Sometimes I use the metalwork that comes with the TV. Other times I form a large hose clip into a kind of rim band. Your solution is better by far.

I like the SOL 20 too: perhaps the only desktop computer with an S100 bus card cage...?
__________________
Karen O

Temporal Paradox: Kills all known grandfathers. Dead.
Karen O is offline   Reply With Quote
Old 19th Apr 2019, 2:00 pm   #6
Argus25
Nonode
 
Argus25's Avatar
 
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,170
Default Re: Vintage amber VDU project

Quote:
Originally Posted by Karen O View Post
That is REALLY nice!

I like the SOL 20 too: perhaps the only desktop computer with an S100 bus card cage...?
One oddity about the Sol-20 is that the S-100 cards were mounted horizontally, unlike many other S-100 computers of the era where they were mounted vertically. They wanted to keep the whole case low profile and oddly that was because they had fixed height wooden sides because the company sourced the wood from a gun stock supplier and it had a limited height.

It is not ideal for cooling as the heat builds up between the S-100 boards. On my Sol-20 I added an extra fan to combat this. In my computer I run three 16k ram cards so I can run 48k CP/M and the heat between the cards is an issue. Also these cards have issues with their digital delay lines.

Here is an article about the cards, if you go to page 24 you will see the cooling fan I added:

http://worldphaco.com/uploads/PROCES...A_RAM_CARD.pdf

Last edited by Argus25; 19th Apr 2019 at 2:09 pm.
Argus25 is offline   Reply With Quote
Old 21st Apr 2019, 2:23 am   #7
Argus25
Nonode
 
Argus25's Avatar
 
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,170
Default Re: Vintage amber VDU project

I just made a very short video of my Walking Man on the Amber monitor. This program was written in 8080 assembly language and uses plots of the $ symbol, since the Sol has no graphics screens, just text:

https://youtu.be/D8PEJsoEWUc
Argus25 is offline   Reply With Quote
Old 21st Apr 2019, 8:28 am   #8
Kentode
Hexode
 
Kentode's Avatar
 
Join Date: Mar 2015
Location: Todmorden, West Yorkshire, UK.
Posts: 339
Default Re: Vintage amber VDU project

That does look good. I'm sure I've seen something similar on a European pedestrian crossing, possibly in Spain.
__________________
Regards, Ken.

BVWS member
Kentode is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 2:36 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright ©2002 - 2019, Paul Stenning.