My first telly TV22 - Page 8 - UK Vintage Radio Repair and Restoration Discussion Forum

Travellingwave · 21st Feb 2021, 12:25 pm

Thanks Helder . Should be able to make something similar

Helder Crespo · 21st Feb 2021, 12:27 pm

Quote:

Originally Posted by Travellingwave

Think I’ll reconnect the EY now and see how it looks

Good idea. The photos of the part are in my previous two posts.
Helder

Helder Crespo · 21st Feb 2021, 12:45 pm

A quick question: when you use the diode(s), do you still get changes in image size with brightness?

beery · 21st Feb 2021, 1:58 pm

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
Andy

Travellingwave · 21st Feb 2021, 2:32 pm

I think the brightness and contrast are now behaving as I would expect and don’t affect the image size

Helder Crespo · 21st Feb 2021, 2:40 pm

Quote:

Originally Posted by Travellingwave

I think the brightness and contrast are now behaving as I would expect and don’t affect the image size

Ok, but do you mean with the diodes in place, or with the EY51 alone?

Travellingwave · 21st Feb 2021, 3:23 pm

With the diodes , will refit the EY51 this PM

Helder Crespo · 21st Feb 2021, 3:26 pm

Quote:

Originally Posted by Travellingwave

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.

Travellingwave · 21st Feb 2021, 3:58 pm

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.

Helder Crespo · 21st Feb 2021, 4:11 pm

Quote:

Originally Posted by Travellingwave

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.

Helder Crespo · 21st Feb 2021, 4:13 pm

Quote:

Originally Posted by Travellingwave

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.

Helder Crespo · 21st Feb 2021, 4:18 pm

Quote:

Originally Posted by Travellingwave

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.
Helder

Helder Crespo · 21st Feb 2021, 4:25 pm

Quote:

Originally Posted by Travellingwave

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?

Travellingwave · 21st Feb 2021, 4:29 pm

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

Travellingwave · 21st Feb 2021, 4:29 pm

I won’t get focus spot on till I make a new cam follower pin for the magnet

Travellingwave · 21st Feb 2021, 5:05 pm

I’ve 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

Helder Crespo · 21st Feb 2021, 5:15 pm

Quote:

Originally Posted by Travellingwave

I’ve 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.

Travellingwave · 21st Feb 2021, 5:22 pm

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.

Sideband · 21st Feb 2021, 6:11 pm

Quote:

Originally Posted by Travellingwave

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.

Helder Crespo · 21st Feb 2021, 7:15 pm

Quote:

Originally Posted by Sideband

Quote:

Originally Posted by Travellingwave

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

21st Feb 2021, 12:25 pm	#141
Travellingwave Pentode Join Date: Jan 2021 Location: York, North Yorkshire, UK Posts: 155	Re: My first telly TV22 Thanks Helder . Should be able to make something similar

21st Feb 2021, 12:45 pm	#143
Helder Crespo Hexode Join Date: Sep 2019 Location: Crystal Palace, Bromley, London, UK. Posts: 417	Re: My first telly TV22 A quick question: when you use the diode(s), do you still get changes in image size with brightness?

21st Feb 2021, 1:58 pm	#144
beery Heptode Join Date: Jun 2006 Location: Ware, Hertfordshire, UK. Posts: 988	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 Andy __________________ www.youtube.com/user/andyvalve100

21st Feb 2021, 2:32 pm	#145
Travellingwave Pentode Join Date: Jan 2021 Location: York, North Yorkshire, UK Posts: 155	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

21st Feb 2021, 3:23 pm	#147
Travellingwave Pentode Join Date: Jan 2021 Location: York, North Yorkshire, UK Posts: 155	Re: My first telly TV22 With the diodes , will refit the EY51 this PM

21st Feb 2021, 3:58 pm	#149
Travellingwave Pentode Join Date: Jan 2021 Location: York, North Yorkshire, UK Posts: 155	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. Attached Thumbnails

21st Feb 2021, 4:29 pm	#154
Travellingwave Pentode Join Date: Jan 2021 Location: York, North Yorkshire, UK Posts: 155	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

21st Feb 2021, 4:29 pm	#155
Travellingwave Pentode Join Date: Jan 2021 Location: York, North Yorkshire, UK Posts: 155	Re: My first telly TV22 I won’t get focus spot on till I make a new cam follower pin for the magnet

21st Feb 2021, 5:05 pm	#156
Travellingwave Pentode Join Date: Jan 2021 Location: York, North Yorkshire, UK Posts: 155	Re: My first telly TV22 I’ve 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 Attached Thumbnails

21st Feb 2021, 5:22 pm	#158
Travellingwave Pentode Join Date: Jan 2021 Location: York, North Yorkshire, UK Posts: 155	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.