Notifications
Clear all

CTV 1978 Pye CT450 - Philips G11 Chassis

 
WayneD
(@wayned)
Reputable V-Ratter Registered
Posts: 270

I've been looking for one of these for years, it's the first TV I remember my parents having. One of my earliest memories is lying on the sofa watching Tomorrow's World on one of these when I was around 3 years old!

20220313 115230
20220313 115249
20220313 120119

 In fact this TV started my interest in fixing things as I remember watching the repair guy fixing it (many times!) I recall one time he replaced the tuner to the "Studio Colour" type as seen on this one. Prior to that it was a clear plastic one and you could see the tuning pegs inside. For a long time I believed that televisions had light bulbs inside as I remember the guy bringing in a basket of light bulbs from the van!

So inside and straight away I can see one of these is not like the others: 

20220313 115404
20220313 115410
20220313 115515
20220313 115856

I'd already anticipated the dreaded red capacitor needing to be changed so I'd already asked Chris @crustytv if he had a replacement prior to picking this up. I was pleasantly surprised that the whole board seems to have been replaced!

 

20220313 115608

 And we have a date:

20220313 115624

It's older than me but only just!

ReplyQuote
Topic starter Posted : 13/03/2022 3:51 pm
crustytv
(@crustytv)
Vrat Founder Admin
Posts: 10843

Wayne, I can't be 100% sure, but I seem to remember it being mentioned it was not only the Red 470uF cap that had the small rivets, but also the light blue. It looks like you have a light blue installed, It might be worth installing the dark Blue one I gave you yesterday as a precaution.

ReplyQuote
Posted : 13/03/2022 4:03 pm
crustytv
(@crustytv)
Vrat Founder Admin
Posts: 10843

Ignore me, light blue is fine, it's the middle shade of blue that has the small rivets, though I think they were better than the red. All very confusing.

20220313 150739

Edit:

I'm confused now, I've just rummaged through my G11 spares and pulled out a load of NOS 470uF caps, even a red one. They all appear to have various size rivets, though the ones on the red cap look feeble compared to all the others. As I say, all very confusing.

ReplyQuote
Posted : 13/03/2022 4:08 pm
WayneD
(@wayned)
Reputable V-Ratter Registered
Posts: 270

@crustytv I'll have a look at the one that's fitted and compare it with the one you gave me. I'll refit whichever one looks the most robust.

ReplyQuote
Topic starter Posted : 13/03/2022 4:22 pm
Cathovisor
(@cathovisor)
Illustrious V-Ratter Registered
Posts: 5477

@wayned I know we had one of these as our first colour television, but I'm pretty sure the front on ours was black - it was rented from Visionhire.

ReplyQuote
Posted : 13/03/2022 4:24 pm
WayneD liked
slidertogrid
(@slidertogrid)
Reputable V-Ratter Registered
Posts: 359
Posted by: @crustytv

Ignore me, light blue is fine, it's the middle shade of blue that has the small rivets, though I think they were better than the red. All very confusing.

20220313 150739

Edit:

I'm confused now, I've just rummaged through my G11 spares and pulled out a load of NOS 470uF caps, even a red one. They all appear to have various size rivets, though the ones on the red cap look feeble compared to all the others. As I say, all very confusing.

Hi Chris

            I worked for a Pye dealer when the G11 was launched. They had a huge amount of hybrid Pye sets on rental the thought was that if they were changed over for new G11s the call rate would fall and money could be spent on the renewal programme instead of wages and spares. A couple of engineers were let go and the new sets flooded in.

Unfortunately the early G11s suffered a lot of faults, they were very fussy about clean mains. A dodgy mains adapter or a sparky set of contacts on the slot meter and bye bye bridge rec diodes! Later sets were modified with a resistor in place of the neutral fuse. Then by about two years old the red smoother started playing up. The rivets on the early ones were the smallest and were very problematic then the first replacements came out with better slightly bigger rivets I can't remember any of those failing. the last generation had the really big rivets like the first blue one in your pictures. 

Our service manager managed to get Pye to pay for replacements so we were told to replace the red ones on sight. 

I went on the Len Briggs lecture when the set was released. There was a lot of talk as to how much effort and research had been put into reliability. and to be fair a lot of the problems were down to component failure rather than design. Once the dry joints had been dealt with and the switch bank changed for the Tip switch unit on Philips versions they were pretty good and had a long life. I have a Philips version as a bedroom set. I have had to do a few repairs but at least it is repairable. Unlike the "Ambilight" that was there before! 

ReplyQuote
Posted : 14/03/2022 9:06 am
WayneD liked
crustytv
(@crustytv)
Vrat Founder Admin
Posts: 10843
Posted by: @slidertogrid

The rivets on the early ones were the smallest and were very problematic then the first replacements came out with better slightly bigger rivets I can't remember any of those failing. the last generation had the really big rivets like the first blue one in your pictures. 

Thanks, for clarifying and putting my mind at rest, that it was really only the Red that was the most troublesome. 👍 

I gave Wayne a 'Dark Blue' version on Saturday. By way of example, these are my remaining stock, other in addition to what I have already installed on spare G11 PCBs.

20220314 090322
ReplyQuote
Posted : 14/03/2022 10:12 am
WayneD liked
slidertogrid
(@slidertogrid)
Reputable V-Ratter Registered
Posts: 359

@crustytv 

I often found when replacing a red smoother that someone had put a screwdriver on the edge of the rivets and given it a clout to stop the connection arcing. This may have been a field engineer who hadn't got a can on board but often it was on an ex rental set that had been sold off, so much for the "been through the workshop"! Another nasty dodge was that they would remove the glow switch and turn up the HT to make the tube look better! This usually resulted in arcing anode caps and the like! 

ReplyQuote
Posted : 14/03/2022 11:13 am