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 15th Sep 2011, 3:24 pm   #141
murphyv310
Banned
 
Join Date: Sep 2006
Location: Kilmarnock, Ayrshire, UK.
Posts: 4,159
Default Re: Restorers dream part 2 the chassis.

Hi Colin.
We are all human you know! That is what I call the learning curve, something we all do to the day we die! Go on plug in the aurora!
murphyv310 is offline  
Old 15th Sep 2011, 3:25 pm   #142
Heatercathodeshort
Dekatron
 
Heatercathodeshort's Avatar
 
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 6,386
Default Re: Restorers dream part 2 the chassis.

All stand up and sing 'Rule Britannia'. It had to be something daft Colin. Don't blame yourself honest. We all make these types of mistakes and will continue to do so.
WELL DONE! More of a lighthouse than first light. Good tube as expected and even a reasonable raster. Loads more to do [cap in tuner, video output anode load resistor. More of this little beast later] and plenty of solutions but don't want to bog you down with component lists at this time. I thought I was going to have to get the huskies and sledge out for an expedition up north around Christmas time but it appears this may no longer be required. The best of luck with the finale. Regards, John.
Heatercathodeshort is offline  
Old 15th Sep 2011, 3:39 pm   #143
Aerodyne
Octode
 
Aerodyne's Avatar
 
Join Date: Jun 2004
Location: Hampton Vale, Peterborough, UK.
Posts: 1,642
Default Re: Restorers dream part 2 the chassis.

Having come in on this thread toward the end, I am, once again struck by the thought that Col is truly an inspiration to us all. He never gives up - and on his way to ultimate success he entertains and guides everyone who reads his progress reports. Well done, Col. You never cease to amaze me.
Tony
Aerodyne is offline  
Old 15th Sep 2011, 3:43 pm   #144
Heatercathodeshort
Dekatron
 
Heatercathodeshort's Avatar
 
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 6,386
Default Re: Restorers dream part 2 the chassis.

Hello Colin,
Rubber glove on. No voltages present here but will take away the fear factor and make a simple job a lot easier.
I have named the various adjustments for set up. The scan coil lever will revolve the coils around the neck of the tube to square the picture within the tube area. The picture position shuffle plate can be unlocked with the locking screw. It will then be found that by sliding it from side to side and pulling the lever up and pushing it down you will be able to centre the picture within the screen area. The ion trap is adjusted for maximum brightness at all times. Use the adjustments mentioned for centering and squaring up the picture, never the ion trap. The large rotary knob on the rear of the assembly is for FOCUS adjustment. Hope this helps. John.
Attached Thumbnails
Click image for larger version

Name:	TUBE SET UP..jpg
Views:	182
Size:	83.4 KB
ID:	56263  
Heatercathodeshort is offline  
Old 15th Sep 2011, 3:44 pm   #145
ENGLISH VICTOR
Hexode
 
Join Date: Feb 2008
Location: Sydney, Australia
Posts: 356
Default Re: Restorers dream part 2 the chassis.

Well done Col, the info I gave you was for the T200 series sets and may well not be the same for the T300 series. If you now have control of the brightness it means there is a resistor from the cathode of the tube to earth not used in the earlier sets and I gave you wrong advice. The important thing is you now have the set working, well almost. Can't wait to see the pictures.
Victor.
ENGLISH VICTOR is offline  
Old 15th Sep 2011, 4:18 pm   #146
ppppenguin
Banned
 
ppppenguin's Avatar
 
Join Date: Dec 2003
Location: North London, UK.
Posts: 6,168
Default Re: Restorers dream part 2 the chassis.

To quote Charlie Duke, the capcom when Apollo 11 landed, rather out of context:

Quote:
You got a bunch of guys about to turn blue. We're breathing again
ppppenguin is offline  
Old 15th Sep 2011, 4:43 pm   #147
Geoff 555
Heptode
 
Geoff 555's Avatar
 
Join Date: Jan 2008
Location: Bristol, UK.
Posts: 842
Default Re: Restorers dream part 2 the chassis.

Hello Col quite simply WELL DONE, I have been joining the thread at every opportunity to see what was happening, I hope that you were not knocked off your chair with the volume of cheering and hand clapping, you are an inspiration to me too keep going no matter what.
Cheers and all the best.
Geoff.
Geoff 555 is offline  
Old 15th Sep 2011, 5:15 pm   #148
Boom
Nonode
 
Boom's Avatar
 
Join Date: Jan 2007
Location: Westbury, Wiltshire, UK.
Posts: 2,451
Default Re: Restorers dream part 2 the chassis.

Col. Have you tried shorting the tubes cathode to grid? This will switch it hard on and will narrow down the fault(s) you are looking for.
__________________
Dave
--------------
A lovely childhood. Just me, my mother and the voices.....
Boom is offline  
Old 15th Sep 2011, 6:03 pm   #149
Boom
Nonode
 
Boom's Avatar
 
Join Date: Jan 2007
Location: Westbury, Wiltshire, UK.
Posts: 2,451
Default Re: Restorers dream part 2 the chassis.

Sorry Col. Just catching up and I seem to be behind with the thread.
__________________
Dave
--------------
A lovely childhood. Just me, my mother and the voices.....
Boom is offline  
Old 15th Sep 2011, 7:06 pm   #150
astral highway
Nonode
 
astral highway's Avatar
 
Join Date: Nov 2006
Location: London, UK.
Posts: 2,739
Default Re: Restorers dream part 2 the chassis.

Quote:
Originally Posted by ppppenguin View Post



Because many hands make light work!

Go and have a to celebrate.

Class. I love it.
__________________
Al
astral highway is online now  
Old 15th Sep 2011, 7:31 pm   #151
jay_oldstuff
Octode
 
jay_oldstuff's Avatar
 
Join Date: Jan 2005
Location: Hyde, Greater Manchester, UK.
Posts: 1,074
Default Re: Restorers dream part 2 the chassis.

WELL DONE from me two. First light is a wonderful thing but your first first light is such a good feeling. cant wait for more progress. your work is inspiring me to get on with a basket case restoration that has stalled.

Jay
__________________
The light at the end of the tunnel is probably the headlight of an oncoming train
jay_oldstuff is offline  
Old 15th Sep 2011, 8:10 pm   #152
Retired
Heptode
 
Retired's Avatar
 
Join Date: Mar 2009
Location: Fenay Bridge, Huddersfield. UK.
Posts: 666
Default Re: Restorers dream part 2 the chassis.

Hi,

What a day Iíve had. A gorgeous day weather wise; a lovely three mile walk in warm sunshine and now success with ďfirst lightĒ days seldom come better than this.

Yes Dom & Keith; next job is to connect the Aurora and get the test card on the screen; I canít wait and already Iíve had the Aurora fired up and flashing powered by a 9V battery but drat it; I thought I had some coaxial cable and spent an hour searching for it without success; I donít like doing bodge jobs so will get hold of some if Mike hasnít any to bring along when he visits tomorrow.

Thanks Trevor and John; during my lifetime Iíve had many steep learning curves but this one was akin to jumping off a cliff and learning to fly; not so much a curve more a vertical line and ballistic at that. Huskies were not needed after all John but it was definitely cold in the workshop very early this morning; I almost dashed out to fit the winter tyres!!

Thank you so much Tony I am deeply moved by your most kind sentiments and continued encouragement both on forum and as a friend via email; such compliments from a renowned expert is praise indeed; thank you.

John you really are a scream at times but Iíve cried enough for one day; Iíve never found my way around a chassis as quickly as Iíve done with this one and for other novices I think the areas to be wary of regarding EHT are the upper LOPT area including the two valve top caps; keep away especially with a meter and also the CRT coating which remains live even with power turned off; I did as Dom suggested and installed a good thick lead giving a direct short between the metal band around the screen and chassis; the metal band on this CRT has a set of metal fingers pressing against the coating. Not EHT but I took a lot of care to ensure mains neutral was by-passed through the on/off switch by adding a short between both tags connected directly to chassis as Joe kindly advised. Iím certainly not over confident John but the rubber glove isnít needed or at least I hope it isnít. I also enjoyed following your advice on how to draw lightning from the U25 John and was most impressed by this; it even looks better done in very poor light.

No harm done whatsoever Victor and thanks for posting.

Thanks Jeffrey; I think I was more amazed than anyone when I saw first light after spending so much time; as Iíve stated many times Iím colour blind and Trevor states that there might have only been a slight change in the display so I was worried about totally missing it; this drove me mad as the screen kept changing with the outside conditions throwing me way off scent; as it turned out though when first light did appear I needed sunglasses. We can all take a deep breath now.

Thanks Geoff; Iím pleased this story has been so well received; what a great bunch of guys you all are; all through this chassis restoration all Iíve ever received is help and understanding; it would have been easy for me to feel well out of it but everything has been explained in a straightforward simple manner that even I could understand; at no point have I been put down or felt intimidated; yes Iíve caused the odd laugh but even this was kind hearted and I could join in; if I can get such a wreck working in such short time due to your expert help and guidance then any novice has nothing to fear from doing similar restorations; itís been a wonderful experience for me and to be honest I feel rather sad that I got first light so quickly as it was very interesting for me and I love a challenge.

No problem Dave and thanks for posting as the advice is worth repeating.

I was just about to post this when I saw your message Jay; many thanks; yes it was a delightful experience in seeing my very first light and good luck with your basket case; these to me are the best to play with.

Had it not been for a buried mains cap which took a great deal of finding and my mistake in removing the EHT lead again wasting a lot of time this chassis would have seen first light much sooner; Iím amazed Iíve seen first light at all.

Thank you all once again for your patience and for reading my rambles.

Kind regards, Col.
Retired is offline  
Old 15th Sep 2011, 8:16 pm   #153
audiomagpie
Heptode
 
audiomagpie's Avatar
 
Join Date: Apr 2003
Location: Rugby, Warwickshire, UK.
Posts: 659
Default Re: Restorers dream part 2 the chassis.

Excellent result so far Col. Like many, I've been quietly watching this thread with great interest from the back. Easy mistake re the metrolsil!

He who makes no mistakes has never made anything at all!

Greg
__________________
Greg

BVWS committee chairman
audiomagpie is offline  
Old 15th Sep 2011, 9:32 pm   #154
Geoff 555
Heptode
 
Geoff 555's Avatar
 
Join Date: Jan 2008
Location: Bristol, UK.
Posts: 842
Default Re: Restorers dream part 2 the chassis.

Hi Col I suspect that you already know this but I was caught out and nearly had a fright thinking gawd now what has happened.The Aurora cuts out after an hour if only displaying the built in test card, simply cut the power supply to it for a few seconds and away you go again.
Cheers.
Geoff.
Geoff 555 is offline  
Old 15th Sep 2011, 9:59 pm   #155
ppppenguin
Banned
 
ppppenguin's Avatar
 
Join Date: Dec 2003
Location: North London, UK.
Posts: 6,168
Default Re: Restorers dream part 2 the chassis.

On most versions of the Aurora this auto-switch off "feature" can be disabled by switch setting. If you let me know the version number (on the label) I should be able to tell you. Should also be in the excellent manual that Darryl provides for download from his website.

I never quite managed to persuade Darryl to scrap this "feature" which ahs caused several people to wonder whether their Aurora was broken.
ppppenguin is offline  
Old 15th Sep 2011, 10:37 pm   #156
Hunts smoothing bomb
Octode
 
Hunts smoothing bomb's Avatar
 
Join Date: Oct 2005
Location: Wimborne, Dorset, UK.
Posts: 1,318
Default Re: Restorers dream part 2 the chassis.

I have been following this thread with great interest and all I can say Col is well done! you have come to the conclusion yourself which in itself is excellent work and as you claim you are too a novice at this game I have to tip my hat to you

Now go and celebrate with a or two!!

Cheers
__________________
Lee
Hunts smoothing bomb is offline  
Old 15th Sep 2011, 11:40 pm   #157
Omegaman
Pentode
 
Omegaman's Avatar
 
Join Date: Dec 2009
Location: Leeds, West Yorkshire, UK.
Posts: 220
Default Re: Restorers dream part 2 the chassis.

One word....

RESPECT!
__________________
Howard G7AJN/M3OCL

"How hard can it be?" - Jeremy Clarkson
Omegaman is offline  
Old 16th Sep 2011, 12:24 am   #158
dominicbeesley
Octode
 
dominicbeesley's Avatar
 
Join Date: Nov 2004
Location: Hebden Bridge, West Yorkshire, UK.
Posts: 1,679
Default Re: Restorers dream part 2 the chassis.

Ha, Ha, Col,

Good to see this looks to have put you in excellent spirits.

Re, the Aurora, coupling it to the set with a random piece of wire may be a bodge but that little box of tricks puts out such a strong signal that a 1" piece of wire hanging out of the RF port and 1' hanging out of the telly tends to work as a broadcast system so don't go waiting until you find some coax. If not go an have a dig behind the telly while bron isn't looking I'm sure you can borrow a foot's worth from the living room set!

Keep up the good work - I'm off in the morning but will be following!

Dom
dominicbeesley is offline  
Old 16th Sep 2011, 7:09 am   #159
ppppenguin
Banned
 
ppppenguin's Avatar
 
Join Date: Dec 2003
Location: North London, UK.
Posts: 6,168
Default Re: Restorers dream part 2 the chassis.

A couple of feet of any old wire will do to connect the Aurora to the TV for now. Assuming the Channel 1 biscuit is fitted in the tuner that's the best one to use for this sort of bodgery. Otherwise any other Band I channel.
ppppenguin is offline  
Old 16th Sep 2011, 8:46 am   #160
Heatercathodeshort
Dekatron
 
Heatercathodeshort's Avatar
 
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 6,386
Default Re: Restorers dream part 2 the chassis.

Hello Colin,
Now you are almost ready to proceed with work on the frame timebase and signal circuits it might be as well to warn you that some capacitors in Ekco receivers appear to be into cross dressing. They look exactly like resistors but under their coloured frocks they are in fact low value capacitors.
They are dark brown in colour with coloured bands that read exactly as the resistor code. i.e Brown Black Red = 1000pf. They generally tend to go O/C after all these years but sometimes develop a very high resistance leak, enough to upset frame linearity. The big fat diode pictured is the frame interlace filter [D3]. Again it goes O/C giving very poor frame lock. These components were made by a company owned by Ekco named EGEN situated just down the road from their factory at Canvey Island Essex. Ekco timebases should be rock solid. It can be replaced by any small diode such as the 1N4001. Another very puzzling fault, poor contrast, odd contrast operation, contrast overload and brightness variations is often due to the video amplifiers anode load resistor [12k] going high resistance typically around 20K. Worth a check. Similar symptoms to the above are also caused by the .1uf wax capacitor INSIDE the tuner. Easy to replace once you know it's there. It decouples the AGC line and goes very leaky. The tuner bottom cover [if it's still there..] will need to be unclipped and the R.F. coil biscuits removed to gain access. I can post a pictorial explanation of this if you need it.
Can't think of anything else that will slip you up at the moment. If the AGC decoupling capacitors are leaky you may find it difficult to adjust the contrast. The AURORA output is clean and strong and the uncontrolled signal stages may overload and give a negative picture. Cheers, John.
Attached Thumbnails
Click image for larger version

Name:	Egen components..jpg
Views:	105
Size:	29.1 KB
ID:	56284  
Heatercathodeshort is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 11:34 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.