UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Television and Video

Notices

Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

Closed Thread
 
Thread Tools
Old 22nd Feb 2013, 9:19 pm   #141
audion_1908
Hexode
 
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 258
Default Re: My Bush TV43 restoration.

I had to look up forumites, lol

Light dimmer as a variac
The light bulb a is a load on the dimmer so it works ok, and light bulb b is current limiter to TV, b can be 1 or more 60w bulbs
lots of electrical noise from the dimmer, but that will not matter, I have one cap the wrong size 2x 2 uf are fitted instead of 3uf its c35 it is to bypass the ht diodes and but ac ripple on the ht line will 4uf be ok, and why is it there in the first place?

thinks have come up and I wont be doing much on the tv for a week or 2, sorry
Attached Thumbnails
Click image for larger version

Name:	limiter.jpg
Views:	79
Size:	26.0 KB
ID:	76595  
audion_1908 is offline  
Old 22nd Feb 2013, 9:36 pm   #142
Sideband
Dekatron
 
Sideband's Avatar
 
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 4,935
Default Re: My Bush TV43 restoration.

You can't use a light dimmer as a variac

Reason? A light dimmer 'chops up' the AC waveform and effectively feeds pulses of AC to a lamp hence the light is dimmer. Just how many pulses (= mark/space ratio) are fed to the lamp depends on where the dimmer control is set. A TV will not like 'chopped up' AC.

Besides with the lamp in circuit, you don't need anything else. Suggest you use a couple of 60 watt lamp in parallel but don't bother with the dimmer.


Rich
__________________
'And, in the end, the love you take is equal to the love you make'
The Beatles.
Sideband is offline  
Old 22nd Feb 2013, 9:44 pm   #143
audion_1908
Hexode
 
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 258
Default Re: My Bush TV43 restoration.

OK, I will try that, start with 1 and work my way up
audion_1908 is offline  
Old 22nd Feb 2013, 9:48 pm   #144
Freya
Octode
 
Freya's Avatar
 
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,465
Default Re: My Bush TV43 restoration.

what type of capacitors are you using for this part of the hum cancellation circuit ?

3.3uf is commonly available

Last edited by Freya; 22nd Feb 2013 at 9:53 pm. Reason: info
Freya is offline  
Old 22nd Feb 2013, 9:51 pm   #145
Sean Williams
Dekatron
 
Sean Williams's Avatar
 
Join Date: Feb 2005
Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW
Posts: 3,191
Default Re: My Bush TV43 restoration.

Cue Johnny Cash......

Fingers crossed Friday evening is here, let's see a piccy of this most auspicious event!

I really hope it works first time - it's a hell of a lot of work otherwise!
__________________
Engineers make things work and have spare bits when finished
Sean Williams is offline  
Old 22nd Feb 2013, 11:34 pm   #146
Station X
Moderator
 
Station X's Avatar
 
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 13,780
Default Re: My Bush TV43 restoration.

I'm afraid we'll all have to wait another couple of weeks Sean.

I wonder if this thread will be up to 200 posts by then?
__________________
Graham. Forum Moderator

Keep the soldering iron hot.
Station X is offline  
Old 23rd Feb 2013, 12:03 am   #147
audion_1908
Hexode
 
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 258
Default Re: My Bush TV43 restoration.

Quote:
Originally Posted by freya2871 View Post
what type of capacitors are you using for this part of the hum cancellation circuit ?

3.3uf is commonly available
it was an very large can, and was ac electrolytic , 3uf and I think 275v or 375v
I fitted an 2uf 630v Polyester or other plastic film Capacitor and a 18 year old 2uf motor run capacitor! I payed for a 1uf 630v capacitor to go with the 2uf to make up 3uf but I am still waiting for it to arrive!!!

I think the hum cancellation circuit is very strange, but as it wants 3uf I can have 4uf or 2uf? which is better?
audion_1908 is offline  
Old 23rd Feb 2013, 12:42 am   #148
audion_1908
Hexode
 
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 258
Default Re: My Bush TV43 restoration.

Quote:
Originally Posted by Sean Williams View Post
Cue Johnny Cash......

Fingers crossed Friday evening is here, let's see a piccy of this most auspicious event!

I really hope it works first time - it's a hell of a lot of work otherwise!
I have found that most things take a lot more time and work than expected and can still disappoint, I have a radio I built using 1930s parts over 8 years ago, it works ok but over runs one of the rf valves, and I still cant fix it I did follow the plans.
I may end up looking for a new CRT if I am not lucky or saving to have it re-gunned in france, eather will take me a long time.

I will film the power up and post the clip, when I do it

Last edited by audion_1908; 23rd Feb 2013 at 12:53 am.
audion_1908 is offline  
Old 23rd Feb 2013, 1:04 am   #149
audion_1908
Hexode
 
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 258
Default Re: My Bush TV43 restoration.

Quote:
Originally Posted by Station X View Post
I'm afraid we'll all have to wait another couple of weeks Sean.

I wonder if this thread will be up to 200 posts by then?
I have had nearly 5000 views and I will have more than 200 posts by the time I am done, I have to get the tv working, get it working well, work on the wooden case, setup and fit the raspberry pi and other bits, designing and building the color converter, and filling the tv with good films and doctor who episodes.
audion_1908 is offline  
Old 23rd Feb 2013, 8:47 am   #150
Heatercathodeshort
Dekatron
 
Heatercathodeshort's Avatar
 
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 6,359
Default Re: My Bush TV43 restoration.

Let us know when your going to fire it up and I will drop an email to the Central Electricity Generating Board. They don't like sudden demand surges.

Now come clean, you are going to spend the next two weeks getting first light just to spoil our fun..

Looks like I'll need a new bulb for the light in the window.

As always, good luck with the end result. Regards, John.
Heatercathodeshort is offline  
Old 23rd Feb 2013, 9:33 am   #151
Sideband
Dekatron
 
Sideband's Avatar
 
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 4,935
Default Re: My Bush TV43 restoration.

Quote:
Originally Posted by audion_1908 View Post
it was an very large can, and was ac electrolytic ,

There is no such thing as an AC electrolytic.

This tells me all....


I don't think I'll contribute any more to this thread.


Good luck though!
__________________
'And, in the end, the love you take is equal to the love you make'
The Beatles.
Sideband is offline  
Old 23rd Feb 2013, 11:46 am   #152
Tazman1966
Octode
 
Tazman1966's Avatar
 
Join Date: May 2006
Location: St Albans, Herts, UK.
Posts: 1,995
Default Re: My Bush TV43 restoration.

It may well have been a typo and should've read "an electrolytic" maybe?
__________________
All the very best,
Tas
Tazman1966 is offline  
Old 23rd Feb 2013, 12:44 pm   #153
audion_1908
Hexode
 
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 258
Default Re: My Bush TV43 restoration.

there are AC electrolytic capacitors, rs still sell them? they are just not used much, it looks like its a paper capacitor?
Bush TV43 Hum Cancellation Cap
https://www.vintage-radio.net/forum/...ad.php?t=71267

http://en.wikipedia.org/wiki/Electrolytic_capacitor
Bipolar electrolytics (also called Non-Polarised or NP capacitors) contain two anodized films, behaving like two capacitors connected in series opposition.[12] These are used when one electrode can be either positive or negative relative to the other at different instants, on alternating current circuits. Bad frequency and temperature characteristics make them unsuited for high-frequency applications. Typical ESL values are a few nanohenries.[13]
audion_1908 is offline  
Old 2nd Oct 2013, 6:08 am   #154
audion_1908
Hexode
 
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 258
Default Re: My Bush TV43 restoration.

I have not tested the Bush tv43 yet, so do not know if the tube is good, but even if its great I would like to have a spare for when the crt gets worn out, as they will only get harder to find in the future! I have found on ebay a lot of possible crt's, I think from my reading here that a Mullard MW 36-44 would be good.
the tubes are 190 miles from me that is a problem as I dont drive, but maybe another member needs a tube and could relay one? I am in surrey

http://www.ebay.co.uk/itm/Television...-/271287781995

Last edited by Sean Williams; 2nd Oct 2013 at 9:17 pm. Reason: to remove ebay list of tubes.
audion_1908 is offline  
Old 2nd Oct 2013, 8:13 am   #155
Freya
Octode
 
Freya's Avatar
 
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,465
Default Re: My Bush TV43 restoration.

There will possibly never be a affordable way to change a tube in a vintage set now, the NOS tubes on ebay are likley to make decent money because of that.
As more enthusiats get into vintage television restoration any remaining new vintage stock will dwindle rapidly and we will be faced with making do with what we have.

You are faced with getting the set running to prove the tube good, no point in sourcing replacements or a spare at this stage IMHO
__________________
Stephen
________________________

"It`s only an old telly"
Freya is offline  
Old 2nd Oct 2013, 10:23 am   #156
Brigham
Heptode
 
Join Date: Mar 2006
Location: Co. Durham, UK.
Posts: 753
Default Re: My Bush TV43 restoration.

Quote:
Originally Posted by audion_1908 View Post
... designing and building the color converter...
I'm curious to know what you propose to use to display the 'color'. A revolving wheel, presumably. Perhaps driven by a Raspberry PYE?
Brigham is offline  
Old 2nd Oct 2013, 1:35 pm   #157
audion_1908
Hexode
 
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 258
Default Re: My Bush TV43 restoration.

yes, I was thinking of using a synchronized spinning color wheel on some glasses like the Vectrex 3D Imager http://www.youtube.com/watch?v=gCQ-L12g8c4 so it could do 3d or color but it would cut the effective frame rate. and the Raspberry pi should make a good media source.
audion_1908 is offline  
Old 3rd Oct 2013, 1:48 pm   #158
Brigham
Heptode
 
Join Date: Mar 2006
Location: Co. Durham, UK.
Posts: 753
Default Re: My Bush TV43 restoration.

Wow! Now that wasn't what I was expecting! I can't quite see how a rather run-down 405-line set fits in with this project. A modern-ish 625-line B&W portable would be easier, being already compatible with the Raspberry, if you must use cathode-rays.
Have you looked at low-definition? Your kind of imagination seems more in line with Baird, rather than Marconi-EMI.
I've been involved with this club:

www.nbtv.org/

...for a good many years, and ideas like yours create much discussion and many actual working products. There is currently a scheme for a PIC-based colour decoder for sequential scanning, although I can't ever remember anyone suggesting a computer-driven helmet-mounted colour wheel. In fact, that alone would be a good article for the club newsletter!
Brigham is offline  
Old 4th Oct 2013, 1:21 am   #159
audion_1908
Hexode
 
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 258
Default Re: My Bush TV43 restoration.

I know a 625 line tv would be much easier, but I was looking for a "run-down 405-line set" as I wanted to mod it and it would be a shame to change a pristine vintage tv, and I like the look of the worn bush tv43.
computer-driven helmet-mounted colour wheel's have been done before, I will probably have most of the problems with software processing the video, and making the motor and wheel run quietly enough! if I could find some, the glasses from the Vectrex 3D Imager would work great.
audion_1908 is offline  
Old 4th Oct 2013, 9:48 am   #160
ianm
Hexode
 
ianm's Avatar
 
Join Date: Jul 2004
Location: Rickmansworth, Hertfordshire, UK.
Posts: 311
Default Re: My Bush TV43 restoration.

Quote:
Originally Posted by audion_1908 View Post
I would like to have a spare for when the crt gets worn out
At the current rate of progress, your existing CRT will last forever!
__________________
Regards

Ian McLaughlin, BVWS member
ianm is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 8:49 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright ©2002 - 2018, Paul Stenning.