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Old 21st Feb 2021, 11:25 am   #141
Travellingwave
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Default Re: My first telly TV22

Thanks Helder . Should be able to make something similar
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Old 21st Feb 2021, 11:27 am   #142
Helder Crespo
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Default Re: My first telly TV22

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Think Iíll reconnect the EY now and see how it looks
Good idea. The photos of the part are in my previous two posts.
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Old 21st Feb 2021, 11:45 am   #143
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Default Re: My first telly TV22

A quick question: when you use the diode(s), do you still get changes in image size with brightness?
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Old 21st Feb 2021, 12:58 pm   #144
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Default Re: My first telly TV22

The missing part, the cam follower needs to be made from brass or aluminium, not steel.
I know that I have some spare TV22 focus units, but probably only at my parents house, so I can't get to them at the moment.
I will have a quick look around here though.

Cheers
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Old 21st Feb 2021, 1:32 pm   #145
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Default Re: My first telly TV22

I think the brightness and contrast are now behaving as I would expect and don’t affect the image size
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Old 21st Feb 2021, 1:40 pm   #146
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Default Re: My first telly TV22

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I think the brightness and contrast are now behaving as I would expect and donít affect the image size
Ok, but do you mean with the diodes in place, or with the EY51 alone?
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Old 21st Feb 2021, 2:23 pm   #147
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Default Re: My first telly TV22

With the diodes , will refit the EY51 this PM
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Old 21st Feb 2021, 2:26 pm   #148
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Default Re: My first telly TV22

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With the diodes , will refit the EY51 this PM
Ok. If without the diodes your raster changes with brightness, then the EY51 is probably at fault.
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Old 21st Feb 2021, 2:58 pm   #149
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Default Re: My first telly TV22

Diodes out , EY51 back in and it works just fine. The brightness still affects the size a bit but nothing like it did . And it actually functions as a brightness control now.
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Old 21st Feb 2021, 3:11 pm   #150
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Default Re: My first telly TV22

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Diodes out , EY51 back in and it works just fine. The brightness still affects the size a bit but nothing like it did . And it actually functions as a brightness control now.
Very impressive! it must feel great. Can your set resolve the finer gratings now?
The size dependence on brightness is normal, provided it is not excessive. If you adjust the contrast to enable viewing in a well-lit room, like with a more modern set, you will probably get more changes with brightness. Adjusting the contrast to a lower position usually minimises this issue. The TV22 is comparatively less bright than anything from the 60s or 70s. So even though the change with brightness can be indicative of a worn EY51, one should resist the temptation of getting the contrast too high up, which of course will give you a brighter image, but you see changes whenever an image goes from dark to bright and vice-versa, including a loss of sharp focus.

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Old 21st Feb 2021, 3:13 pm   #151
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Default Re: My first telly TV22

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Diodes out , EY51 back in and it works just fine. The brightness still affects the size a bit but nothing like it did . And it actually functions as a brightness control now.

Judging from your image, your line sync is rock solid. It would be great to see a closeup of the raster. I think your camera lens may need some cleaning to remove the glow. Otherwise the picture is fantastic.
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Old 21st Feb 2021, 3:18 pm   #152
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Default Re: My first telly TV22

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Diodes out , EY51 back in and it works just fine. The brightness still affects the size a bit but nothing like it did . And it actually functions as a brightness control now.
You can also adjust the horizontal form (see photo) to get better horizontal linearity. This adjustment, the horizontal width and the focus are somewhat interdependent.
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Old 21st Feb 2021, 3:25 pm   #153
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Default Re: My first telly TV22

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Diodes out , EY51 back in and it works just fine. The brightness still affects the size a bit but nothing like it did . And it actually functions as a brightness control now.
I have another question: what do you think was the most important change that resulted in a smaller dependence of image size on brightness?
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Old 21st Feb 2021, 3:29 pm   #154
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Default Re: My first telly TV22

Realising that the focus magnet was not working is what solved it, the set is pretty much back to how it was when I first switched on , apart from fixing the brightness pot and a bit of twiddling
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Old 21st Feb 2021, 3:29 pm   #155
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I won’t get focus spot on till I make a new cam follower pin for the magnet
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Old 21st Feb 2021, 4:05 pm   #156
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Default Re: My first telly TV22

Iíve bodged up a pin for the focus , not pretty bu it works

Attached a close up of the picture, I can see the vertical lines on all but one of the gratings now
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Old 21st Feb 2021, 4:15 pm   #157
Helder Crespo
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Default Re: My first telly TV22

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Iíve bodged up a pin for the focus , not pretty bu it works

Attached a close up of the picture, I can see the vertical lines on all but one of the gratings now
Looks great really. Thanks.
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Old 21st Feb 2021, 4:22 pm   #158
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Default Re: My first telly TV22

Thanks for all the help and interest from everybody.

I guess next step is to put it back in the case and hook up something to watch on it.
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Old 21st Feb 2021, 5:11 pm   #159
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Default Re: My first telly TV22

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I can see the vertical lines on all but one of the gratings now
I doubt that you will see the vertical lines clearly on the last grating even with optimal focus. It's excellent as it is and you've done a great job.
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Old 21st Feb 2021, 6:15 pm   #160
Helder Crespo
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Default Re: My first telly TV22

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Quote:
Originally Posted by Travellingwave View Post
I can see the vertical lines on all but one of the gratings now
I doubt that you will see the vertical lines clearly on the last grating even with optimal focus. It's excellent as it is and you've done a great job.
It is possible to see them, but it requires excellent alignment. A good example can be found here (photo on the last post of this thread's page): https://www.vintage-radio.net/forum/...ht=tv22&page=4
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