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| Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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2nd Mar 2020, 3:27 pm
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#1 |
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Nonode
Join Date: Feb 2005
Location: Worcestershire, UK.
Posts: 2,534
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TV22 line output - in depth
Dr. Hugo Holden (previously Argus25 on this forum) has just completed an exhaustive analysis of the Bush TV22 line output stage and transformer, with measurements and waveforms. Also included is a discussion of the TV22 'interlace problem' and its correction.
This useful resource can be accessed here: http://worldphaco.com/uploads/BUSH_TV22.pdf Steve |
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2nd Mar 2020, 4:40 pm
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#2 |
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Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,935
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Re: TV22 line output - in depth
Thank you Steve.
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G8JET BVWS Archivist and Member V.M.A.R.S |
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2nd Mar 2020, 6:53 pm
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#3 | |
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Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Re: TV22 line output - in depth
Quote:
Helder |
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2nd Mar 2020, 9:32 pm
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#4 |
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Octode
Join Date: Jan 2003
Location: Birmingham, West Midlands, UK.
Posts: 1,268
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Re: TV22 line output - in depth
Awesome ! Though I had to read one bit several times, rubbing my eyes in disbelief ... it mentions replacing a Mullard CRT with a Mazda one !
Must admit I'm not happy with the cracked tar on my TV22 LOPT, but not sure I'm brave enough to tackle it. TTFN, Jon |
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2nd Mar 2020, 9:55 pm
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#5 |
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Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Re: TV22 line output - in depth
Does anyone know where to get a 2500V 470pF dipped silver mica capacitor? This is to replace C34 (on Trader sheet 1091). I could only find it in a couple of US suppliers and the shipping costs are very high. Delivery time is not the best either. Thanks!
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6th Mar 2020, 5:49 pm
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#6 |
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Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,990
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Re: TV22 line output - in depth
You may be best emailing Hugo, if you look at the latest info from Cornell Dubilier they do not seem to produce that value / voltage capacitor any more.
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Stephen _________"It`s only an old telly"  ___
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7th Mar 2020, 12:24 am
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#7 | |
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Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Re: TV22 line output - in depth
Quote:
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8th Mar 2020, 2:24 pm
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#8 |
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Heptode
Join Date: Jan 2003
Location: Tewkesbury, Gloucestershire, UK.
Posts: 693
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Re: TV22 line output - in depth
Thanks, Steve, for posting the link. But most importantly, thanks to Hugo (Argus 25) for your superb article!
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Keith Yates - G3XGW VMARS & BVWS member http://www.tibblestone.com/oldradios/Old_Radios.htm |
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