A 625 line valve monochrome monitor kit??? - UK Vintage Radio Repair and Restoration Discussion Forum

Courtney Louise · 18th Jan 2022, 12:05 am

Hey all

I want to build a small 7 or 9” mono monitor to take a composite 625 signal also with a low power stereo audio amp.

I have a collection of vintage computers and I would love to have a small valve monitor houses in a plexiglass case with like a ZX81 or something feeding it.

Anyone got any ideas on this?

Cheers

C

Osvaldo LW1DSE · 1st Feb 2022, 10:56 pm

PC monitor usually requieres larger bw than tv sets, more than 50MHz. Are you able to manage such a circuit? Horizontal deflection and eht supplies are very cum ersome, thougt about the 15KV for the TRC anode.

See_Mos · 2nd Feb 2022, 4:13 pm

The ZX81 had very low resolution so band width would not be a problem and the time base would be the same as UK television.

As for using valves there would be more of a problem finding a LOPTx. I don't know of any small screen valve sets that would provide a source of components.

The only other option I can think of is to get hold of something like an old Thorn portable and use that, maybe hide the chassis and fire up the heaters on a few spare valves to create the effect required.

Courtney Louise · 5th Feb 2022, 6:42 pm

I was thinking of using a more recent tube/yoke/LOPT section from a donated set if the rest can be designed with valves..

Cobaltblue · 5th Feb 2022, 6:46 pm

The KB Featherlight was an 11" transportable valve set.

Cracking little set just don't pick it up by its handle (long story).

You can see one in this thread.

https://www.vintage-radio.net/forum/...ad.php?t=94115

Cheers

Mike T

FrankB · 6th Feb 2022, 5:02 am

I might suggest some of the ac/battery operated TV sets from the 70's & 80"s that were used here in the U.S.

IIRC they made some with 2-1/2 - 6" CRT's. I remember one Radio Shack one I saw with comp. inputs on the back of it. I think Sony was who made a lot of them. Long time to remember back accurately.

jhalphen · 8th Feb 2022, 3:04 pm

Hi to all,
Hi Courtney Louise,

For the fun of it, you can build this small 5" B&W TV/Monitor from a Chinese kit, it even has an A/V input. see photos & (lousy, Sorry!) schematic.
I didn't post the link to the product to avoid contradicting forum rules.
You can probably find it easily via the UK version of the Ali web site.

Best Regards
jhalphen
Paris/France

Cobaltblue · 8th Feb 2022, 3:21 pm

As this is a request although not in the sets and parts required, I think post an eBay link under this situation is permitted.

Rule C3
You may not post links or references to items just because they interest you, though you may respond to a "Sets/Parts Wanted" or "Information Wanted" post by mentioning an eBay item or posting a link to it.

So this is a request so you can put the link in you post.

Cheers

Mike T

18th Jan 2022, 12:05 am	#1
Courtney Louise Octode Join Date: Sep 2005 Location: Welshpool, Powys, Wales Posts: 1,327	A 625 line valve monochrome monitor kit??? Hey all I want to build a small 7 or 9” mono monitor to take a composite 625 signal also with a low power stereo audio amp. I have a collection of vintage computers and I would love to have a small valve monitor houses in a plexiglass case with like a ZX81 or something feeding it. Anyone got any ideas on this? Cheers C __________________ *33, 45, 78, around and around they go...* Last edited by Radio Wrangler; 18th Jan 2022 at 12:33 am. Reason: Title spelling fixed

1st Feb 2022, 10:56 pm	#2
Osvaldo LW1DSE Tetrode Join Date: Jan 2022 Location: Barrio Garay, Almirante G. Brown, Buenos Aires, Argentina Posts: 76	Re: A 625 line valve monochrome monitor kit??? PC monitor usually requieres larger bw than tv sets, more than 50MHz. Are you able to manage such a circuit? Horizontal deflection and eht supplies are very cum ersome, thougt about the 15KV for the TRC anode. __________________ Enjoying high heel sandals, shoes or boots when I can.

2nd Feb 2022, 4:13 pm	#3
See_Mos Hexode Join Date: Nov 2003 Location: Ossett, West Yorkshire, UK. Posts: 482	Re: A 625 line valve monochrome monitor kit??? The ZX81 had very low resolution so band width would not be a problem and the time base would be the same as UK television. As for using valves there would be more of a problem finding a LOPTx. I don't know of any small screen valve sets that would provide a source of components. The only other option I can think of is to get hold of something like an old Thorn portable and use that, maybe hide the chassis and fire up the heaters on a few spare valves to create the effect required.

5th Feb 2022, 6:42 pm	#4
Courtney Louise Octode Join Date: Sep 2005 Location: Welshpool, Powys, Wales Posts: 1,327	Re: A 625 line valve monochrome monitor kit??? I was thinking of using a more recent tube/yoke/LOPT section from a donated set if the rest can be designed with valves.. __________________ *33, 45, 78, around and around they go...*

5th Feb 2022, 6:46 pm	#5
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,865	Re: A 625 line valve monochrome monitor kit??? The KB Featherlight was an 11" transportable valve set. Cracking little set just don't pick it up by its handle (long story). You can see one in this thread. https://www.vintage-radio.net/forum/...ad.php?t=94115 Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

6th Feb 2022, 5:02 am	#6
FrankB Heptode Join Date: Oct 2005 Location: Olympia, Washington, USA. Posts: 664	Re: A 625 line valve monochrome monitor kit??? I might suggest some of the ac/battery operated TV sets from the 70's & 80"s that were used here in the U.S. IIRC they made some with 2-1/2 - 6" CRT's. I remember one Radio Shack one I saw with comp. inputs on the back of it. I think Sony was who made a lot of them. Long time to remember back accurately.

8th Feb 2022, 3:04 pm	#7
jhalphen Hexode Join Date: Jul 2004 Location: Paris, France Posts: 350	Re: A 625 line valve monochrome monitor kit??? Hi to all, Hi Courtney Louise, For the fun of it, you can build this small 5" B&W TV/Monitor from a Chinese kit, it even has an A/V input. see photos & (lousy, Sorry!) schematic. I didn't post the link to the product to avoid contradicting forum rules. You can probably find it easily via the UK version of the Ali web site. Best Regards jhalphen Paris/France Attached Thumbnails

8th Feb 2022, 3:21 pm	#8
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,865	Re: A 625 line valve monochrome monitor kit??? As this is a request although not in the sets and parts required, I think post an eBay link under this situation is permitted. Rule C3 You may not post links or references to items just because they interest you, though you may respond to a "Sets/Parts Wanted" or "Information Wanted" post by mentioning an eBay item or posting a link to it. So this is a request so you can put the link in you post. Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk