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CTV 1967 Baird M702: 700 Series Chassis: Dual Standard

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crustytv
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Indeed they did Malc, evidenced by the one found in my 1975 MB 7773 9000

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Posted : 30/07/2015 2:22 am
Nuvistor
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I wonder if the RCA tubes fitted in the 9000 chassis were due to supply problems with the difficulties at the Skelmersdale factories?
I knew there were problems at the factory, information from people who worked there but I had not read the Hansard article before.

The comment about the different technologies that Philips and RCA had to make the CRT's, I thought they would have been very similar but obviously not.

All the CTV's I saw upto the import of Japanese sets used Mullard tubes, or I don't remember any having Mazda/RCA ones.

Frank

Frank

 
Posted : 30/07/2015 7:43 am
crustytv
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I was wondering if those smoothing cans are totally kaput, or would they reform - I have seen worse - much worse!

Marion

Hi Marion,
Do you think they might? In which case I will remove the worst one and bring it up in stages to the rated voltage on my bridge to see if it will reform.

As a precaution I've ordered a replacement, found a NOS Lorlin 400+400uF 350VDC (see below) in Spain of all places, shame there weren't two.

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Posted : 30/07/2015 9:41 am
malcscott
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I should have these in stock, Malc.

 
Posted : 30/07/2015 9:56 am
crustytv
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Hi Malc,

I did think you and your epic stores but I thought I can't keep on asking.

If you do have a spare 400+400uF 350V, that would be great. I honestly don't expect a freebie and I'm happy to pay the going rate, perhaps just a little less than the one I just ordered. That cost £20 delivered from Spain, so less the postage which was £6.

Chris

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Posted : 30/07/2015 10:22 am
malcscott
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Hi Chris, i have nos 400/400/100/325v and 600/600/300v, any use to you? Malc.

 
Posted : 30/07/2015 11:58 am
Till Eulenspiegel
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Rediffusion used RCA precision in line CRTs in the Mark 3 and the S4 tube in the Mark 4.

Till Eulenspiegel.

 
Posted : 30/07/2015 12:23 pm
malcscott
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They did and they were better than the Videocolour ones they used later. I have a couple or so early Mk3 sets fitted with original RCA tubes still display nice bright pics. The main reason for failure of Mk3 tubes was the fact that the field engineers never set the HT volts when replacing a PSU panel, Malc.

 
Posted : 30/07/2015 12:47 pm
crustytv
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Hi Chris, i have nos 400/400/100/325v and 600/600/300v, any use to you? Malc.

Just the job Malc :thumb

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Posted : 30/07/2015 1:46 pm
malcscott
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They await your collection, in all day. They will need reforming as they are dated - 1983/1981 (Ex Rediffusion) Malc.

 
Posted : 30/07/2015 1:53 pm
crustytv
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Hi Malc,

Will pop over in a couple of hours, much appreciated. :thumb

I think I remember these cans, are they the ITT blue band ones? I had one off you last year and it reformed nicelyafter a couple of hours on the bridge.

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Posted : 30/07/2015 2:02 pm
malcscott
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The 400/400/100 are STC the 600/600 are LCR.

 
Posted : 30/07/2015 2:42 pm
crustytv
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Collected the caps from Malc :aad and drooled over his Standard 10. So now to reform these as Malc advised, they've been in his stores for 30+ years.

Just in case anyone is interested, the procedure I use is to introduce the power in steps. The bridge is capable of supplying about 550V . I start on the lowest 20-100V monitoring both the current, voltage attained and neon. Initially the current draw starts high subsequently dropping as the voltage set is reached, at which point the neon extinguishes. I then discharge and repeat the step at the same starting voltage, a good cap will reach the set voltage point a lot quicker. Next is to select the next voltage range 100-200V repeating as discussed until reaching the rated voltage.

Some caps reform quickly others take longer, I've only had one of these STC in the past fail to reform, so lets see how long it takes these ones, place your bets.

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Posted : 30/07/2015 5:04 pm
crustytv
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3¼ hours later and these are really struggling to reform but they are slooooowly heading in the right direction. Only time will tell this might take a couple or days or more.

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Posted : 30/07/2015 8:16 pm
Tazman1966
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In the 718 that I used to have the smoothing electrolytic had vented badly and then went promptly short circuit. Luckily I had a new (old stock) RS replacement.

Good luck Chris

Tas

 
Posted : 30/07/2015 9:07 pm
crustytv
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Hi Tas,

I followed you and Mikey working on your M718 thread on UKVRRR, lovely set too especially unusual being a 19" console! Interesting your C607/C608 was shot the same as mine, weakspot? Also your C603/C604 was fine as is mine. I've yet to delve in and see what the tripler looks like but I'm keeping my fingers crossed.

If anyone fancies a good read of the M718 here it is

As ever a thoroughly entertaining, inspiring and informative thread as I've mentioned before I have you and Mikey to [strk]blame[/strk] thank for my total conversion to all things vintage colour. :aad

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Posted : 30/07/2015 9:15 pm
Tazman1966
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Thanks Chris! I feel proud to have been part of your conversion to colour...I think, hehe! "Parabla" now has the set in his stash in a rather large "to do" pile

Tas

 
Posted : 30/07/2015 9:18 pm
PYE625
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Hi,
And I have Crusty and the main site to thank for kindling my interest in vintage colour....
Never thought I would obtain a set as good as my Pye CT72 though.
I have to pinch myself now and then to believe it lol

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 30/07/2015 9:22 pm
crustytv
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Reform Update: Finally one section is starting to motor now, its up to 200V dmm

Hi Andrew,

glad the Main site lured you to the dark side, otherwise known as the RGB side :qq1 That's always been its main aim to promote and further the cause of Early British Colour television. Your PYE certainly is a treasure and just goes to show e-bay can unexpectedly turn up gems.

Another nice thing is I'm getting a fair amount of e-mail and site contact feedback from ex trade who aren't members, stating how they love looking at the old sets and especially thankful for the photos of the insides, some of which they've not seen in over 40+ years turning them all misty eyed.

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Posted : 30/07/2015 9:32 pm
crustytv
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Finally 5½ hours later, one section reformed. Only another 3 sections to do....or put another way only another 15 hours :ccf

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Posted : 30/07/2015 10:24 pm
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