Hi to all friends of the old TV technology,
since yesterday I'm a new member in this group. For 20 years I'm interesting in the old radios from the 50's and I'm restoring them too.For some months I'm interested in the old TV technology too.
Some weeks ago I started to build a very simple TV. My intension is to put a videosignal in it and
watch it on the screen of the DG7-32.
I attached a link of the circuit to the mail.
https://www.dropbox.com/s/i2721v54xykvdqf/1.jpg?m
https://www.dropbox.com/s/kfqw1a2fahovv0y/2.jpg?m
The deflection part is made with 2 EF80
An aditional syncronization part can be attached to the schematic too.
The 3rd part of the schematic is the CRT related circuit.
I fed a video signal ( with my digicam) into the grid of the video amp ( EL84) and was able to syncronize it with the x and y pots by hand.
But the pic I could see on the CRT was very very bad. Perhaps the CRT related part is made too simple to get a useful pic, I tried a lot of adjustments but I wasn't sucessful.
The x,y sawtooth signals are ok ( 64 us and 20 ms signal ) so I wonder where the problem could be.
Because some of you are building similar constructions I think someone could be able to give me some advises to get a better pic on the CRT.
It would be great if you're able to give me informations about your experiences with the circuits you use for this purpose or send me the schematic you've used for the TV.
Perhaps someone of you have made experiences with the same schematic too.
Thank you very much for all kind of advices.
kind regards
Didi