Homebrew television project - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Dual Standard · 12th Mar 2006, 11:06 pm

From memory I am pretty certain that only the 'C' variant of the VCR517 had a long persistance phosphor, and even then it was not anything like as long as say a 5FP7. So if your CRT is just a plain vanilla VCR517 or a VCR517B then it should be fine for TV use.

I also think that the VCR517 series were happier at a higher EHT and thus produced a smaller spot size but of course required a tad more deflection voltage for the same scan.

Mike

Balloonvalves · 14th Apr 2007, 5:53 pm

Hi,
I have builded a 625line Television monitor by using Oscilloscope CRT, i tried with DG7-32, DG7-36, 2AP1 ,5BP1 and 5BP4 they work. I have posted in this forum somewhere with the title of "round screen project" but i cant find it.
I have VCR97 with socket i havent try it. The main purpose i want to see how the simplest circuit can work.
The circuit i use only 4 or 5 valves. but linearity is not good, sometime horizontal sync unstable.
http://diyparadise.com/yabb/YaBB.pl?num=1160661071/0#0
sorry for my poor english. I looking "argus" VCR97 Television contruction information.

GS CH'NG,

Panrock · 15th Apr 2007, 5:31 pm

Quote:

Originally Posted by Balloonvalves

I looking "argus" VCR97 Television contruction information.

Get it here:
http://www.radiocraft.co.uk/argus.htm

Steve

murphyv310 · 18th Apr 2007, 9:01 pm

Hi Sean.
My dad built a set with the VCR97 years ago I "think" I still have the blueprint somewhere and will have a look. The Veiwmaster of the early 50's is also a great project.
Trevor

dave walsh · 18th Apr 2007, 10:39 pm

This may be a naive question and I don't want to go OT but would the people like chipp who contemplate building a repro mirror lid tv 30's style [another thread] benefit from building this type of reproducer rather than using a more modern [and square] set?
I'm referring to the VCR97 type size and the fact that it is a round screen crt which I believe was originally the only type available for early tv. Dave

PS I do have the box and handbook for a nineteen fifties tv kit plus photos of it working but [sadly] not the set itself.

Panrock · 19th Apr 2007, 9:17 am

Sadly, I think it would be a bit dim for practical viewing by Chipp...

Steve

http://www.copycoder.com/bvts_images/Imgp0128.jpg

dave walsh · 19th Apr 2007, 11:41 am

Looks good in the dark though Steve. That's how we used to view anyway
circa 1955 if not 1935. Thanks for ex pic. I'm just glad it wasn't a completely daft idea. Dave

12th Mar 2006, 11:06 pm	#21
Dual Standard Hexode Join Date: Aug 2005 Location: Cheshire, UK. Posts: 263	Re: Homebrew television project From memory I am pretty certain that only the 'C' variant of the VCR517 had a long persistance phosphor, and even then it was not anything like as long as say a 5FP7. So if your CRT is just a plain vanilla VCR517 or a VCR517B then it should be fine for TV use. I also think that the VCR517 series were happier at a higher EHT and thus produced a smaller spot size but of course required a tad more deflection voltage for the same scan. Mike

14th Apr 2007, 5:53 pm	#22
Balloonvalves Retired Dormant Member Join Date: Sep 2006 Location: Malaysia-Penang Posts: 1	Re: Homebrew television project Hi, I have builded a 625line Television monitor by using Oscilloscope CRT, i tried with DG7-32, DG7-36, 2AP1 ,5BP1 and 5BP4 they work. I have posted in this forum somewhere with the title of "round screen project" but i cant find it. I have VCR97 with socket i havent try it. The main purpose i want to see how the simplest circuit can work. The circuit i use only 4 or 5 valves. but linearity is not good, sometime horizontal sync unstable. http://diyparadise.com/yabb/YaBB.pl?num=1160661071/0#0 sorry for my poor english. I looking "argus" VCR97 Television contruction information. GS CH'NG,

18th Apr 2007, 9:01 pm	#24
murphyv310 Dekatron Join Date: Sep 2006 Location: Kilmarnock, Ayrshire, UK. Posts: 5,422	Re: Homebrew television project Hi Sean. My dad built a set with the VCR97 years ago I "think" I still have the blueprint somewhere and will have a look. The Veiwmaster of the early 50's is also a great project. Trevor __________________ Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member

18th Apr 2007, 10:39 pm	#25
dave walsh Dekatron Join Date: Jan 2006 Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex. Posts: 5,817	Re: Homebrew television project This may be a naive question and I don't want to go OT but would the people like chipp who contemplate building a repro mirror lid tv 30's style [another thread] benefit from building this type of reproducer rather than using a more modern [and square] set? I'm referring to the VCR97 type size and the fact that it is a round screen crt which I believe was originally the only type available for early tv. Dave PS I do have the box and handbook for a nineteen fifties tv kit plus photos of it working but [sadly] not the set itself.

19th Apr 2007, 9:17 am	#26
Panrock Nonode Join Date: Feb 2005 Location: Worcestershire, UK. Posts: 2,533	Re: Homebrew television project Sadly, I think it would be a bit dim for practical viewing by Chipp... Steve http://www.copycoder.com/bvts_images/Imgp0128.jpg __________________ https://www.radiocraft.co.uk

19th Apr 2007, 11:41 am	#27
dave walsh Dekatron Join Date: Jan 2006 Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex. Posts: 5,817	Re: Homebrew television project Looks good in the dark though Steve. That's how we used to view anyway circa 1955 if not 1935. Thanks for ex pic. I'm just glad it wasn't a completely daft idea. Dave