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 Post subject: Homebrew Electrostatic TV Set.
PostPosted: Jan Tue 21, 2020 8:43 am 
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Joined: Jan Thu 16, 2020 12:29 am
Posts: 579
This homebrew project might of some interest, though it could also be posted in the TV section too.

I became fascinated with the notion of home made electrostatic deflection TV sets. I looked at a few designs with scope CRT's (like the 5BP1) and some of the English ones. Practical Television (PT) magazine in the UK published an interesting one using a VCR97 Radar CRT, they called it the Argus.

I had also remembered from my childhood seeing the bright red pentode, the EF50. These really are "eye candy" on the account of the color.These are said the be "The Pentode that won the war" that is explained in the article below.

So I designed and built this TV partly based on the Argus, but I changed some of its circuitry and the entire mechanical design. The original had sub-chassis. I went with a single chassis, machined to my design by Landfall Systems in TX. I painted it myself. It is strong enough to support the large Hammond power transformers & chokes.

It has a few interesting features. I used a Neon tube transformer for the EHT and opened its magnetic gap. I wound all the RF coils myself and went mainly for bifilar types (the reasoning is in the article). The deflection oscillators & scan output design is an uncommon configuration in the USA for electrostatic deflection, a Miller-Transitron type, but this was very popular in the UK for home brew TV's.

There is a lot more detail and better quality images here:

http://worldphaco.com/uploads/ARGUS.pdf

Also in that pdf are some CRT screen pictures from one of my favorite Sci-Fi movies, with Al Hedison and Vincent Price; The Fly. A very interesting message in this story, that one very small thing (in that case a fly) can foul up a large project and I think when building any large project it pays to remember that the Devil is in the detail.


Attachments:
arg1.jpg
arg1.jpg [ 673.48 KiB | Viewed 1422 times ]
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 Post subject: Re: Homebrew Electrostatic TV Set.
PostPosted: Jan Tue 21, 2020 5:31 pm 
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Joined: Dec Sun 21, 2008 3:59 pm
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Your skill and dedication to the art of Homebrew is incredible!
Merrill Yeager


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 Post subject: Re: Homebrew Electrostatic TV Set.
PostPosted: Jan Tue 21, 2020 6:31 pm 
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Location: Sanford Fla 32771 (USA)
Outstanding work ACORNVALVE.
Seeing those green screen shots of TV programs reminded me of a lashup I did when stationed at a remote USAF transmitter site. The mountain top I was stationed at could only receive one TV station (somewhere in Newfoundland) and our set had a very weak CRT. So I lashed up one of our oscilloscopes to stand in for our black and white CRT. It worked very well, just every TV picture was now in green.

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Last edited by pauls.ironhorse on Jan Wed 22, 2020 8:39 pm, edited 1 time in total.

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 Post subject: Re: Homebrew Electrostatic TV Set.
PostPosted: Jan Tue 21, 2020 6:50 pm 
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Location: Mission Viejo, southern California
Wow, it appears to be factory-made, and from a superior quality maker! How about a photo of the bottom of the chassis?

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 Post subject: Re: Homebrew Electrostatic TV Set.
PostPosted: Jan Tue 21, 2020 10:22 pm 
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FStephenMasek wrote:
Wow, it appears to be factory-made, and from a superior quality maker! How about a photo of the bottom of the chassis?


If you look at the link to the pdf I posted and scroll through the detailed article on it, you will see a good under-chassis photo with a lot of the major components labelled.


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 Post subject: Re: Homebrew Electrostatic TV Set.
PostPosted: Jan Wed 22, 2020 5:59 am 
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Location: Mission Viejo, southern California
Thanks, I did, and it is outstanding.

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many of my radios http://s269.photobucket.com/user/FSteph ... t=3&page=1


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 Post subject: Re: Homebrew Electrostatic TV Set.
PostPosted: Jan Wed 22, 2020 7:56 am 
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Joined: Feb Sun 05, 2012 5:12 pm
Posts: 975
Location: North Syracuse NY 13212
I built a TV using a 2AP1. Here's the prototype:
Attachment:
hbtv1.jpg
hbtv1.jpg [ 121.74 KiB | Viewed 1281 times ]

Attachment:
hbtv2.jpg
hbtv2.jpg [ 131.81 KiB | Viewed 1281 times ]


I later built it up with two vertically stacked chassis, but I still haven't taken a photo.
It did work, but the signal level dropped off after the rebuild. I built the tuner from scratch.
At the time, we had channels 3 and 5, so I only built enough to get 3, 4 for the VCR, and 5.

I picked up this one a few years ago:
Attachment:
HBTV3.jpg
HBTV3.jpg [ 207.49 KiB | Viewed 1281 times ]


I removed the 7JP4 before I took it home.
There were many parts floating around the CRT circuits, and the voltage doubler had one side of an electrolytic on the AC line, and the other end on the B+. Of course there was more ripple than DC. I don't believe it ever worked.

I drew up the schematic and rebuilt it. It needed lots more B+ to get a reasonably sized image, and I didn't bother with the tuner and IF.
The horizontal sync works great even with a VCR, and the video quality is very good:
Attachment:
Timing.jpg
Timing.jpg [ 124.79 KiB | Viewed 1281 times ]



Bob

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 Post subject: Re: Homebrew Electrostatic TV Set.
PostPosted: Jan Wed 22, 2020 5:44 pm 
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Acornvalve, I think you may be in the wrong forum--this should be in the "Radio as Fine Art" forum. Have you had these projects in a gallery? They should be on display in an art museum.

Norm

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 Post subject: Re: Homebrew Electrostatic TV Set
PostPosted: Jun Sun 14, 2020 10:03 pm 
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While researching my newly acquired and utterly demolished 62 unit (with VCR97 aka CV1097 CRT) someone on another forum (buizenradioclub.nl) suggested to convert it into an "Oog in Al" TV as designed by the Dutch magazine Radio Bulletin in 1951/2. This was the European version of the Argus project. I decided to build a solid state version of it. The design kept me off the streets for weeks but now I have an acceptable picture:

Attachment:
ss_argus_ripples_solved.jpg
ss_argus_ripples_solved.jpg [ 771.5 KiB | Viewed 518 times ]


I still have to complete the enclosure but that is only mounting two connectors (BNC video input and IEC 60320 C8 socket for power). I will create a writeup about this crazy project that has no merit whatsoever but was a fun journey.

Even so, hats off to ACORNVALVE!


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 Post subject: Re: Homebrew Electrostatic TV Set
PostPosted: Jun Mon 15, 2020 5:00 am 
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Joined: Jan Thu 16, 2020 12:29 am
Posts: 579
PE9ZZ wrote:
While researching my newly acquired and utterly demolished 62 unit (with VCR97 aka CV1097 CRT) someone on another forum (buizenradioclub.nl) suggested to convert it into an "Oog in Al" TV as designed by the Dutch magazine Radio Bulletin in 1951/2. This was the European version of the Argus project.


Hi,

I have not seen or heard of the Oog in AL TV, do you have a link to information on it ?

Hugo.


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 Post subject: Re: Homebrew Electrostatic TV Set
PostPosted: Jun Mon 15, 2020 6:48 am 
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Location: Amsterdam
ACORNVALVE wrote:
I have not seen or heard of the Oog in AL TV, do you have a link to information on it?

The original OCR scans are here. The issues are 1952-11,12 and 1953-1,2. I created new PDFs from the originals and will post those on my own site polonai.se. Attached is the first one (in Dutch). Note that the original scans have OCR information that my PDF hasn't.


Attachments:
Oog in al TV deel 1.pdf [1.8 MiB]
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 Post subject: Re: Homebrew Electrostatic TV Set.
PostPosted: Jun Mon 15, 2020 12:46 pm 
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Joined: Jul Fri 07, 2006 6:09 pm
Posts: 1650
Location: Charlotte, NC
kd2ww wrote:
Your skill and dedication to the art of Homebrew is incredible!
Merrill Yeager


I will second that. Well done sir, you are a craftsman!


Last edited by Greg G on Jun Mon 15, 2020 1:39 pm, edited 1 time in total.

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 Post subject: Re: Homebrew Electrostatic TV Set
PostPosted: Jun Mon 15, 2020 12:55 pm 
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Joined: Jun Sun 14, 2020 9:47 pm
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Location: Amsterdam
Heh- wait until you see my clunker... I'm putting it all together right now, should have imagery today or tomorrow. BTW- my contraption is video in only. Building an RF front end and IF would be a bit overdone with the analog TV transmitters gone. I do have a few professional CATV ones at the ready though.

Edit: well, here it is:

Attachment:
ss_argus_finished.jpg
ss_argus_finished.jpg [ 1008.18 KiB | Viewed 464 times ]


As my radio shack is brightly lit by the sun the image is all but invisible (chessboard pattern). Once it is dark I can make some more piccies.


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 Post subject: Re: Homebrew Electrostatic TV Set.
PostPosted: Jun Tue 16, 2020 6:21 am 
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Joined: Nov Fri 30, 2012 3:35 am
Posts: 396
Location: Phoenix, AZ
I came across another interesting article describing how to build a "televisor" in the August 1941 issue of Radio & Television, page 206 and following. This one is unusual because it uses a TRF circuit, not a superhet. It's the visual section only, no audio, and it uses a potentially lethal HV power supply, but it sure would be fun to build one. Unfortunately the magazine stopped before they got around to publishing construction info for the sound section. https://worldradiohistory.com/Archive-S ... 941-08.pdf
R/ John


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 Post subject: Re: Homebrew Electrostatic TV Set.
PostPosted: Jun Tue 16, 2020 12:58 pm 
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Joined: Jan Thu 16, 2020 12:29 am
Posts: 579
UV201 wrote:
I came across another interesting article describing how to build a "televisor" in the August 1941 issue of Radio & Television, page 206 and following. This one is unusual because it uses a TRF circuit, not a superhet. It's the visual section only, no audio, and it uses a potentially lethal HV power supply, but it sure would be fun to build one. Unfortunately the magazine stopped before they got around to publishing construction info for the sound section. https://worldradiohistory.com/Archive-S ... 941-08.pdf
R/ John


I was interested to see that construction article, which uses the 5AP4 CRT. These have an interesting history. They were designed by National Union at the request of Frank Andrea. Basically, electrically, they were identical to the 5BP4, but had a shortened bulb. Andrea needed them for the KTE-5 television kit and the the 1F5 cabinet version.

Here is my restoration article on the KTE-5:

http://worldphaco.com/uploads/THE_MEISS ... _KTE-5.pdf

Where you can see a good photo of the 5AP4. These CRT's also feature in Fink's book.


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 Post subject: Re: Homebrew Electrostatic TV Set
PostPosted: Jun Tue 16, 2020 1:04 pm 
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Joined: Jan Thu 16, 2020 12:29 am
Posts: 579
PE9ZZ wrote:
ACORNVALVE wrote:
I have not seen or heard of the Oog in AL TV, do you have a link to information on it?

The original OCR scans are here. The issues are 1952-11,12 and 1953-1,2. I created new PDFs from the originals and will post those on my own site polonai.se. Attached is the first one (in Dutch). Note that the original scans have OCR information that my PDF hasn't.


Thanks for those interesting links.


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 Post subject: Re: Homebrew Electrostatic TV Set.
PostPosted: Jun Wed 17, 2020 3:03 am 
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https://tenor.com/view/goodjob-clap-nic ... if-7248435

A raise of Applause to ACORNVALVE!

Your workmanship is incredible. Never seen something like that, especially with a metal chassis. It is also built with Loctals (Or Loktals)! It even includes the tuner!

I suck at metal and designing IF states and Tuners. I use fiberglass copper clad board. It is easily cut. I am designing 2 sets, one of them is a 19 inch compactron set (Using a DTV converter), the other one is a Loctal tube set (What a coincidence!) that is electrostaticly deflected. Probably DTV too.

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