Featured
Latest
1956 Pye 405 line N...
 
Share:
Notifications
Clear all

Forum 141

[Sticky] 1956 Pye 405 line NTSC CTV.

202 Posts
20 Users
41 Likes
21.7 K Views
Till Eulenspiegel
(@till)
Posts: 4947
Famed Member Registered
Topic starter
 

Let's find out if that frame linearity fault can be fixed once and for all. Just about everything in the frame timebase has been checked except one component, the scanning coils. Along with the original metal cone CRT which went down to air many years ago, the scanning coils were supplied by RCA. After removing the CRT neck components and the metal screen which is fitted at the rear of the scan coils I noticed a fair amount of corrosion on the tags which connect to the coil lead out wires. You never know, I might get lucky and the frame linearity fault could just be bad solder connections.
These early colour CRTs have a 50mm neck. I'm also on the lookout for a replacement CRT socket.

Till Eulenspiegel.

Forum 142

 

 
Posted : 05/01/2016 7:03 pm
Bobhowe
(@bobhowe)
Posts: 167
Estimable Member Registered
 

Hi David could this be this years contender for the queens speech ? Would HKS not have a tube socket for it regards Bob

 
Posted : 05/01/2016 8:20 pm
Till Eulenspiegel
(@till)
Posts: 4947
Famed Member Registered
Topic starter
 

Hi Bob,
Ready the set for the Queen's Speech? That's a good idea. We know the set works, in a fashion, but since the set has been in my possession (it was acquired by me in 2001) I've never come up with an answer to the frame timebase problem.
Later this year the Pye colour set will be sixty years old.

Till Eulenspiegel.

 
Posted : 05/01/2016 8:53 pm
Bobhowe
(@bobhowe)
Posts: 167
Estimable Member Registered
 

Hi David do you think there should be a forum vote on it to get it ready for its 60th Birthday as well as this set is very special

 
Posted : 05/01/2016 9:20 pm
Till Eulenspiegel
(@till)
Posts: 4947
Famed Member Registered
Topic starter
 

Hi Bob,
I have another early colour set coming up for restoration. This one is a dual standard hybrid. The Pye is with the exception of a few crystal diodes all valve. Not a transistor in sight.
So what's to be, the Pye or the mystery newcomer?

Till Eulenspiegel.

 
Posted : 05/01/2016 10:27 pm
Bobhowe
(@bobhowe)
Posts: 167
Estimable Member Registered
 

Hi David i will start a new thread & let the forum decide

 
Posted : 05/01/2016 11:00 pm
Till Eulenspiegel
(@till)
Posts: 4947
Famed Member Registered
Topic starter
 

Democracy in action.

Till Eulenspiegel.

 
Posted : 05/01/2016 11:14 pm
Till Eulenspiegel
(@till)
Posts: 4947
Famed Member Registered
Topic starter
 

Would HKS not have a tube socket for it regards Bob

I've tried searching ebay without any success. Didn't some scope tubes use this base?

Till Eulenspiegel.

 
Posted : 05/01/2016 11:32 pm
TVJON74
(@tvjon74)
Posts: 680
Honorable Member Registered
 

Hi Till,
What type of socket is it and what's the tube?

Jon
BVWS Member

 
Posted : 05/01/2016 11:40 pm
Bobhowe
(@bobhowe)
Posts: 167
Estimable Member Registered
 

Yes you are right i t could be a scope base Ed Dinning might have one

 
Posted : 05/01/2016 11:51 pm
Till Eulenspiegel
(@till)
Posts: 4947
Famed Member Registered
Topic starter
 

Hi Bob, I'll have a word with Ed about the tube base.

Hi Jon, The CRT presently installed in the Pye is a Mullard AX53-10, it's an all glass round faceplate tube and is similar to the American 21CYP22.
The original CRT was the RCA 21AXP22 which is a metal cone type. This tube has gone down to air as most of these metal-glass tubes do.
The AX53-10 was made by Philips in Holland. Used in the Philips K4 CTV.

Till Eulenspiegel.

 
Posted : 06/01/2016 1:11 am
ntscuser
(@ntscuser)
Posts: 866
Honorable Member Registered
 

I believe the Philips roundie has a brown tube base whereas the RCA one is black?

Classic TV Theme Tunes

 
Posted : 06/01/2016 2:02 am
Till Eulenspiegel
(@till)
Posts: 4947
Famed Member Registered
Topic starter
 

That's correct. That's how the tubes I have here are like.

Till Eulenspiegel.

 
Posted : 06/01/2016 2:07 am
Doz
 Doz
(@doz)
Posts: 1491
Prominent Member Registered
 

That tube base looks familiar ... :aaq

It's from my homebrew monitor with DG7-32 CRT http://andydoz.blogspot.com/2014/09/simple-tv-using-dg7-32-scope-tube.html

I got the base from eBay seller "Michael's elctronics emporium" if memory serves.

 
Posted : 06/01/2016 10:31 pm
Rebel Rafter
(@rebel-rafter)
Posts: 184
Reputable Member Registered
 

Hi from RR. What a revelation this is, I never knew there were 405 colour sets made, I thought colour was never used on 405, only tried out experimentally. Didn't colour not start in the UK until 1967? How come there was CTV's here in the 1950's? or were these sets made for export to the states, I know they had colour in the 50's, but they didn't have 405, did they? or did they? or were these made for Europe? I thought the US always had 525 lines. What colour system were these PYE sets made for? The power consumption must've been phenomenal with a 50mm neck and all valves and I thought the B&O 3400 was high on power at 360w. How much power did these sets use? RR.

 
Posted : 06/01/2016 11:36 pm
Terrykc
(@terrykc)
Posts: 4005
Member Rest in Peace
 

The first demonstration of colour that I can recall was at the Earls Court Radio Show.

I can't remember the year but it was well before we had any 625-line transmissions in this country.

I was 14 when I went to the Radio Show for the first time - that would have been in 1958 - but I'm sure it was later than that. However it would have been before the Pilkington Committee decided in favour of 625-lines as the future UK system and quashed any ideas of colour on 405-lines. That was in June 1962 so I'm guessing that the demonstration was around 1960.

It was in a special gallery and featured sets from all the manufacturers side by side so that visitors could walk past this continuous stream of colour sets.

One of them, I recall, was looking decidedly sick. I think it was the GEC set but apologies if I've made a mistake!

The demo consisted of a continuous sequence of slides and test films - the same ones that were shown in the colour test transmissions on BBC-TV* - on 405-lines, of course! - from Crystal Palace every afternoon in lieu of the test card.

* Note that it didn't become BBC1 until BBC2 started in 1964!

When all else fails, read the instructions

 
Posted : 07/01/2016 12:02 am
Cathovisor
(@cathovisor)
Posts: 6418
Famed Member Registered
 

You may find the colour segment here (at 1:03:10) of interest. The film is This Is The BBC, which won the BAFTA for Best Specialised Film of 1959.

The system used in these experiments was a variation of the NTSC system.

 
Posted : 07/01/2016 12:28 am
ntscuser
(@ntscuser)
Posts: 866
Honorable Member Registered
 

The 405-line colour TVs were built for evaluation purposes only, none were marketed. The trade feared that if the consumer thought that colour was "right around the corner" sales of B&W sets would dry up. For that reason there was very little mention of the subject in the trade press at the time.

The Pye is extremely rare in not having been adapted to 625-line PAL colour operation at some time in the 1960s as almost all the other surviving colour sets were.

Classic TV Theme Tunes

 
Posted : 07/01/2016 5:22 am
Terrykc
(@terrykc)
Posts: 4005
Member Rest in Peace
 

You may find the colour segment here (at 1:03:10) of interest. The film is This Is The BBC, which won the BAFTA for Best Specialised Film of 1959.

The system used in these experiments was a variation of the NTSC system.

It's a pity that the APTS couldn't get the aspect ratio right! It looks as if it has been cropped to 16:9 and then shown at 4:3.

By "variation" I presume you mean 'adapted for the 405-line system'.

When all else fails, read the instructions

 
Posted : 07/01/2016 11:04 am
Cathovisor
(@cathovisor)
Posts: 6418
Famed Member Registered
 

You may find the colour segment here (at 1:03:10) of interest. The film is This Is The BBC, which won the BAFTA for Best Specialised Film of 1959.

The system used in these experiments was a variation of the NTSC system.

It's a pity that the APTS couldn't get the aspect ratio right! It looks as if it has been cropped to 16:9 and then shown at 4:3.

Unfortunately, very common with 4:3 material on YouTube but I'm not sure where the error creeps in - it looks like it's been double-ARC'ed. This is correct in terms of aspect ratio but seems to have very low level sound.

By "variation" I presume you mean 'adapted for the 405-line system'.

Isn't that what a variation is? A change or slight difference? A different or distinct form or version of something? Mere semantics.

 
Posted : 07/01/2016 12:08 pm
Page 1 / 11
Share: