UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV 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 2nd Sep 2019, 8:02 pm   #81
sexton_mallard
Hexode
 
sexton_mallard's Avatar
 
Join Date: Sep 2013
Location: Ellesmere, Shropshire, UK & Co. Cork, Ireland.
Posts: 359
Default Re: Kolster Brandes RV 10 (Crown)

Thank you so much John. You have a PM.
__________________
Dom

Less snakes...more ladders!

Last edited by sexton_mallard; 2nd Sep 2019 at 8:08 pm. Reason: Grammar
sexton_mallard is offline  
Old 3rd Sep 2019, 11:59 am   #82
Hunts smoothing bomb
Octode
 
Hunts smoothing bomb's Avatar
 
Join Date: Oct 2005
Location: Wimborne, Dorset, UK.
Posts: 1,393
Default Re: Kolster Brandes RV 10 (Crown)

Well this really has become a head scratcher! I can't see it being anything else apart from the scan coils, let's see if Johns coils sort this one out once fitted! (fingers crossed)

(I wish you well John not suffering with anything too serious I hope?)

Kind regards
__________________
Lee
Hunts smoothing bomb is offline  
Old 5th Sep 2019, 7:16 pm   #83
Heatercathodeshort
Dekatron
 
Heatercathodeshort's Avatar
 
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 7,755
Default Re: Kolster Brandes RV 10 (Crown)

Posted at Broadbridge Heath this afternoon. We are all holding our breath!

[I'm fine Dom. Just a nuisance not being able to drive at the moment. First time since 1964. The bike can be hard work here in hilly Horsham but I must admit I feel a bit vulnerable but drivers seem very considerate. I'm surprised]

Good luck with the RV10. John.
Heatercathodeshort is offline  
Old 5th Sep 2019, 8:25 pm   #84
sexton_mallard
Hexode
 
sexton_mallard's Avatar
 
Join Date: Sep 2013
Location: Ellesmere, Shropshire, UK & Co. Cork, Ireland.
Posts: 359
Default Re: Kolster Brandes RV 10 (Crown)

Quote:
Originally Posted by Heatercathodeshort View Post
Posted at Broadbridge Heath this afternoon. We are all holding our breath!

[I'm fine Dom. Just a nuisance not being able to drive at the moment. First time since 1964. The bike can be hard work here in hilly Horsham but I must admit I feel a bit vulnerable but drivers seem very considerate. I'm surprised]

Good luck with the RV10. John.
Thank you so much John! Stay tuned for the next update.
__________________
Dom

Less snakes...more ladders!
sexton_mallard is offline  
Old 13th Sep 2019, 11:07 pm   #85
sexton_mallard
Hexode
 
sexton_mallard's Avatar
 
Join Date: Sep 2013
Location: Ellesmere, Shropshire, UK & Co. Cork, Ireland.
Posts: 359
Default Re: Kolster Brandes RV 10 (Crown)

After a frankly day at work, I wandered back to my shed to try and console myself that maybe, just maybe it was deflection coils and I will see some light on the screen. I placed the coils that John kindly provided and...I have a raster... of sorts! .

I don't have the magnets or linearity sleeve back on the tube neck yet. Next is to refit these and try and pull the raster out to the whole screen.
Attached Thumbnails
Click image for larger version

Name:	raster-ish.jpg
Views:	111
Size:	31.4 KB
ID:	190134  
__________________
Dom

Less snakes...more ladders!
sexton_mallard is offline  
Old 14th Sep 2019, 7:28 am   #86
Heatercathodeshort
Dekatron
 
Heatercathodeshort's Avatar
 
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 7,755
Default Re: Kolster Brandes RV 10 (Crown)

That looks a bit odd. Make sure you have the connections correct to the line and frame coils.
I would expect maybe slight lack of width/height etc but not such a distorted raster.The lin sleeve will only correct slight errors in width/linearity so no need to fit for a test.
At least it's showing something! Check the coil connections themselves in case of post damage.John.
Heatercathodeshort is offline  
Old 20th Sep 2019, 10:08 pm   #87
sexton_mallard
Hexode
 
sexton_mallard's Avatar
 
Join Date: Sep 2013
Location: Ellesmere, Shropshire, UK & Co. Cork, Ireland.
Posts: 359
Default Re: Kolster Brandes RV 10 (Crown)

I had one of the line coil connections seemingly on the wrong tag, the one in the centre. The frame coils only have two connections. Now I get a 3 inch collapsed frame which varies in height slightly with adjustment of the controls. Boost voltage is up to 640 volts and the brightness has to be turned right down. The tube seems to be good! Present personal circumstances has limited my 'shed' time to tinker away. I will check for causes of the compressed height next.
Attached Thumbnails
Click image for larger version

Name:	WP_20190920_003.jpg
Views:	69
Size:	40.8 KB
ID:	190561  
__________________
Dom

Less snakes...more ladders!
sexton_mallard is offline  
Old 22nd Sep 2019, 8:12 pm   #88
sexton_mallard
Hexode
 
sexton_mallard's Avatar
 
Join Date: Sep 2013
Location: Ellesmere, Shropshire, UK & Co. Cork, Ireland.
Posts: 359
Default Re: Kolster Brandes RV 10 (Crown)

Attention turned to the frame circuit. The vertical linearity pot was scratchy and intermittent but responded to some servisol, measuring in spec. I switched the 2 PCL82s around to see if there was a difference - no difference was noticed. After about 5 minutes the raster expands up to fill most of the screen. I will carry on checking components in the frame circuit. Just out of curiosity I rigged up my Aurora and the set is fairly 'deaf', but that is for later fault finding. I know this set is going to drag its heels but it will be dragged back to a fully working set! This has been a great learning experience so far.
__________________
Dom

Less snakes...more ladders!

Last edited by sexton_mallard; 22nd Sep 2019 at 8:19 pm.
sexton_mallard is offline  
Old 23rd Sep 2019, 7:12 am   #89
Heatercathodeshort
Dekatron
 
Heatercathodeshort's Avatar
 
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 7,755
Default Re: Kolster Brandes RV 10 (Crown)

Yes it has but you have kept at it! The slow opening frame is usually due to a lazy heating PCL82. Swapping the valves may not prove the point as the sound output valve is often in a very much worse state [but still working] than the frame. I have spare PCL82s if you need one.
There should be more than enough sound but that should be an easy one. Regards, John.
Heatercathodeshort is offline  
Old 28th Sep 2019, 8:55 am   #90
sexton_mallard
Hexode
 
sexton_mallard's Avatar
 
Join Date: Sep 2013
Location: Ellesmere, Shropshire, UK & Co. Cork, Ireland.
Posts: 359
Default Re: Kolster Brandes RV 10 (Crown)

John, thank you very much for the PCL82s. The 2 in the set were replaced. Not much improvement to the frame height but the sound from the speaker is much louder. I am now checking all of the components around the frame circuit, the height control is fine. So far, an 1.8M Ohm resistor coupling the height control to the anode of the triode side of the V12 PCL82 had gone high to 4MOhm. A replacement increased the height from 2-3 inches to 5-6 inches. I will carry on checking.
__________________
Dom

Less snakes...more ladders!
sexton_mallard is offline  
Closed Thread

Thread Tools



All times are GMT. The time now is 3:59 am.


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 - 2021, vBulletin Solutions, Inc.
Copyright ©2002 - 2020, Paul Stenning.