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Technical information
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1969 Philips G22K511
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Radios-TV on YouTube
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Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
Self build B/W Monitor
for some years i have a dream about to build my own B/W monitor (from the start i want to build a television) but i dont want the tuner and IF, so far i have a schematic to build from, it is from a old Danish television from 1961, it will have 6 tubes, i have earlier make som tests on TV and put the composit signal from videosource directly to G1 on the video tube (often Pcl84 or Pl83), it have a isolation transformer between the TV and powerplug.
A friend of me is electronic engineer ,and the told me that a videomonitor needs a "videoshaper" circuit for more stable picture, so my question is, can anybody comfirm that? and does anyone have some schematic to a tube broadcast video monitor? im curious about how its build up
Alex 🙂
Hi Alex,
to build a good quality video monitor you will need to satisfy several requirements the average TV set does not. So, taking them in turn:
1. A flat frequency response in the video amplifier to beyond the system bandwidth in question, with good group delay characteristics. It must not be influenced by the capacity of the CRT cathode.
2. Stabilised EHT, so changes in beam current do not affect the size of the picture, which leads to
3. Stabilised scans, and very importantly
4. A proper black level video clamp that actually clamps the signal to video black level, not the sync tips. The video is normally clamped during the back porch of the video signal and you'll need to avoid clamping on the burst (often a small choke is inserted to remove it).
Elektrotanya has the service manual for an old stalwart we used for many years at work, the Melford DU1. You may wish to download and study it.
Hi.
I know the basics about clambing, black level ect. but im just curious about how other build monitors like Philips EL5749(based on tubes NOT transistors) i want to keep it simple,
Posted by: @acj1980does anyone have some schematic to a tube broadcast video monitor? im curious about how its build up
If you look in the library under "Broadcast Monitors" you will find the circuit diagram for the monochrome PYE 2780 broadcast quality monitor. Its 405 only but is all valve and might give you some of the insights you are looking for.
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Here's a thing I made a few years ago. It's not up to much tbh, but it was an interesting project for a while...
https://andydoz.blogspot.com/2014/09/simple-tv-using-dg7-32-scope-tube.html
Hi .
Thanks for the tip to the schematic, i have studied for a while now, its very interesting, i think you know the schematic so is it okay if i asked for some question to it?
regards
Alex
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