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 19th Nov 2019, 2:25 pm   #21
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
Default Re: Philips G8 G22K522

Our friends are C545 and 546. They are 5n1 in my book, though you'll need to double check the values in your set. The balancing coil (L003) is next to them. Replacements can be tricky to find. The originals are 1500v peak. I see some NOS ones on ebay, but they are the original type and prone to failure. Otherwise two 2.5nF in parallel for each would do, but the best I can find immediately is in the RS range. They're rated at 1000v which might be a bit low. They also stock 10nF (pt 114-452), two of which could be used in series for each capacitor. I'd be guided by what others have done.
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline  
Old 19th Nov 2019, 4:48 pm   #22
linescan87
Heptode
 
linescan87's Avatar
 
Join Date: Mar 2014
Location: Meath, Ireland
Posts: 547
Default Re: Philips G8 G22K522

Hi '77,

I have a couple of 5.1nf 1500v caps your welcome to. PM me your address if you need them.
Attached Thumbnails
Click image for larger version

Name:	15741784517455033648547261155173.jpg
Views:	196
Size:	32.0 KB
ID:	193951  
__________________
All the best, John Joe

www.youtube.com/c/ojnojirishvintagetvandradio
linescan87 is offline  
Old 19th Nov 2019, 7:12 pm   #23
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default Re: Philips G8 G22K522

Hi,
Quote:
Originally Posted by Welsh Anorak View Post
Hang your meter on the 205v rail, switch on and see what you get.
Where would that be? I'm not really familiar with how power supplies work, only their basics. I do really need to get hold of a schematic or diagram as 1100 Man says.

Quote:
you might need to improvise a bracket - and did you say there was a lead off?
I found where it sits, on that beigey part (Post 11, first image, above the LOPT). There's also an extra pin for the Tripler, hiding out of sight.

Quote:
Also, a little easing oil in the balancing coil won't go amiss
Is there any recommended oil? I have WD40 but I know that's not always the best option

Quote:
Originally Posted by Welsh Anorak View Post
though you'll need to double check the values in your set.
Will do, i'll get back with the results when I have tested them.

Quote:
Originally Posted by linescan87 View Post
I have a couple of 5.1nf 1500v caps your welcome to. PM me your address if you need them.
Hi,

Thank you for the offer, i'll send you a PM.

Thanks for the replies
19Seventy7 is online now  
Old 19th Nov 2019, 7:18 pm   #24
ms660
Dekatron
 
ms660's Avatar
 
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
Default Re: Philips G8 G22K522

https://philipstv.co.uk/g8-electronics/

https://philipstv.co.uk/wp-content/u...mpressed-2.jpg

Lawrence.
ms660 is offline  
Old 19th Nov 2019, 7:21 pm   #25
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default Re: Philips G8 G22K522

Perfect! Thank you for linking those,

Looks to be an interesting site too.

Thanks
19Seventy7 is online now  
Old 19th Nov 2019, 10:52 pm   #26
Hampus
Pentode
 
Hampus's Avatar
 
Join Date: May 2010
Location: Sandviken, Sweden
Posts: 233
Default Re: Philips G8 G22K522

Here's a sad tale what can happen if those green capacitors fail:

https://www.vintage-radio.net/forum/...ad.php?t=47402

It almost happened to me too, the CRT survived but the arcing sound was horrible.

I recommend that you do not power the TV up until these are replaced.
Hampus is offline  
Old 20th Nov 2019, 11:47 am   #27
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default Re: Philips G8 G22K522

Thank you for that read, I definitely wont turn it on until they’re replaced. I dont think i would’ve, but that thread will definitely make me think twice should I think about it, for one reason or another.

Thanks
19Seventy7 is online now  
Old 20th Nov 2019, 12:28 pm   #28
Tazman1966
Nonode
 
Tazman1966's Avatar
 
Join Date: May 2006
Location: St Albans, Herts, UK.
Posts: 2,193
Default Re: Philips G8 G22K522

Hampus - that was my set. These line output stage tuning capacitors didn't seem to cause so much bother back in the old days other than going short circuit occasionally without the disastrous results that going open causes!

Good luck 1977!
__________________
All the very best,
Tas
Tazman1966 is offline  
Old 20th Nov 2019, 1:49 pm   #29
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default Re: Philips G8 G22K522

Thank you, I think i’ll need it haha.

Thanks
19Seventy7 is online now  
Old 21st Nov 2019, 10:55 am   #30
1100 man
Octode
 
1100 man's Avatar
 
Join Date: Apr 2016
Location: Ventnor, Isle of Wight, & Great Dunmow, Essex, UK.
Posts: 1,377
Default Re: Philips G8 G22K522

Quote:
Originally Posted by Hampus View Post
Here's a sad tale what can happen if those green capacitors fail:

https://www.vintage-radio.net/forum/...ad.php?t=47402

It almost happened to me too, the CRT survived but the arcing sound was horrible.

I recommend that you do not power the TV up until these are replaced.
That thread makes for a very interesting (& enjoyable) read. I had heard of the issue with G11's, but the picture of the CRT with the hole in the neck is amazing. For something as trivial as a capacitor going open circuit causing such a catastrophic failure is also amazing!

Of course, caps usually fail short, but a dry joint on the leg (and Philips did like a dry joint!) would cause the same effect.

I bet at the time, customers were incredulous that the failure of a 50p capacitor resulted in needing a new CRT & scancoils and I guess would normally write the set off.

Cheers
Nick
1100 man is offline  
Old 21st Nov 2019, 11:32 am   #31
Heatercathodeshort
Dekatron
 
Heatercathodeshort's Avatar
 
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
Default Re: Philips G8 G22K522

To be fair I repaired countless G8's and never had these caps fail. It is a time problem. Decades of probably damp storage has seen them all off.
Just a few years ago I had one of those green type caps fail in a Philips 20T324 [320 chassis] It popped the line oscillator chip..Luckily I had a spare. John.
Heatercathodeshort is offline  
Old 21st Nov 2019, 1:08 pm   #32
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
Default Re: Philips G8 G22K522

Like HKS, we had loads of G8s in and I really can't remember replacing those capacitors - maybe once for a picture that was too large. However they did cause trouble on the Pye 713 series.
1977 - don't use WD40. Something like 3-in-1 is fine, though just a drop. You want it to seep down into the coil.
I advised you to remove the fuse which you have done. This isolates the line output stage so these capacitors are out of circuit along with the LOPT and everything else. The 205v rail is easily measured at either of the fuses on the power supply panel. You won't do it any harm running it for a while without the line stage connected - don't worry.
Glad you've found where to put the tripler - odd that it was removed. Take the top hat connector off the LOPT before you start running things up. Those caps look the business so let us know when they're fitted.
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline  
Old 21st Nov 2019, 1:20 pm   #33
greg_simons
Octode
 
greg_simons's Avatar
 
Join Date: Jul 2004
Location: Evesham, Worcestershire, UK.
Posts: 1,415
Default Re: Philips G8 G22K522

Quote:
Originally Posted by 1100 man View Post
That thread makes for a very interesting (& enjoyable) read. I had heard of the issue with G11's, but the picture of the CRT with the hole in the neck is amazing. For something as trivial as a capacitor going open circuit causing such a catastrophic failure is also amazing!

Of course, caps usually fail short, but a dry joint on the leg (and Philips did like a dry joint!) would cause the same effect.

I bet at the time, customers were incredulous that the failure of a 50p capacitor resulted in needing a new CRT & scancoils and I guess would normally write the set off.
Hi nick
Yes indeed, I've replaced a good few 20ax picture tubes with the neck punctured, that main smoother was a killer!, the scan coils would just come off in your hand with the electron gun still attached!, circuit protection has come a long way since.
Greg.
__________________
Picture, sound?, DOOR.
greg_simons is online now  
Old 21st Nov 2019, 4:06 pm   #34
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default Re: Philips G8 G22K522

Quote:
Originally Posted by Welsh Anorak View Post
don't use WD40. Something like 3-in-1 is fine
Okay, I've got plenty of that so that'll be no problem.

Quote:
The 205v rail is easily measured at either of the fuses on the power supply panel. You won't do it any harm running it for a while without the line stage connected - don't worry.
Okay, I'll get to measuring when I can. i'll leave everything disconnected as you said too.

Quote:
odd that it was removed
I think it was under repair, then abruptly stopped, which could explain why it was never returned to it's bracket.

Will let you know when the caps are fitted. They're on their way to me, so i'll put them in as soon as I get them.

Thanks for your help
19Seventy7 is online now  
Old 15th Dec 2019, 10:56 pm   #35
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default Re: Philips G8 G22K522

Hi,

I was just wondering if there's anyway I could re-insulate the LOPT. I know it was said it'd be fine, but my room is starting to get damp in the colder weather, even though I have the heating on. I do have the TV in front of the radiator to keep moisture away as much as possible, as well as a dressing gown over the vents to keep moisture out as much as I can.

Unfortunately no signs of any caps yet, although I've had 2 pairs sent to me, none have turned up yet, I'll give it a week and if they're a no show i'll look online to buy some

Thanks
19Seventy7 is online now  
Old 16th Dec 2019, 9:29 am   #36
Ed_Dinning
Dekatron
 
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,171
Default Re: Philips G8 G22K522

Hi, I might have a pair of NOS 5n1 caps (yellow Philips types). Give me a couple of days to find them.

Ed
Ed_Dinning is offline  
Old 16th Dec 2019, 10:53 am   #37
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
Default Re: Philips G8 G22K522

If Ed is sending you some caps I'm sure he'll have some transformer tape that you could use. It's not a problem, but it would look nicer and would keep the damp out..
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline  
Old 16th Dec 2019, 5:32 pm   #38
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default Re: Philips G8 G22K522

Hi,

Linescan87 is very kindly sending me another pair as the first pair failed to arrive. Thank you for the offer though, Ed, I appreciate it.

I think i'll get to ordering some transformer tape, I didn't even know it existed!
My main issue was the damp, as I don't want the LOPT failing! That'd be a nightmare.

Thanks for your help, I appreciate it
19Seventy7 is online now  
Old 16th Dec 2019, 9:09 pm   #39
linescan87
Heptode
 
linescan87's Avatar
 
Join Date: Mar 2014
Location: Meath, Ireland
Posts: 547
Default Re: Philips G8 G22K522

I'm sure it would be possible to dry out the lopt using the DC current trick.
__________________
All the best, John Joe

www.youtube.com/c/ojnojirishvintagetvandradio
linescan87 is offline  
Old 16th Dec 2019, 9:21 pm   #40
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default Re: Philips G8 G22K522

Oh? What's the DC current trick? I have the heating on, with the TV in front of it at the moment to dry out any moisture, and to try and prevent any more moisture from getting near the set, but the heating isn't on all of the time.

Thanks
19Seventy7 is online now  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 2:44 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 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.