4th Dec 2022, 12:59 pm | #61 |
Octode
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Re: English Electric TV sets
Oh that's very sad I guess that's the sight we all dread when we power up a tube for the first time in decades. Other tube problems can sometimes be got round, but there's not much you can do when the vacuum's all gone!
I expect the magic they used to glue it together all those years ago has worn off now - mind you we are expecting rather a lot for these things to still work after 70 - 80 years! Cheers Nick |
4th Dec 2022, 3:20 pm | #62 |
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Re: English Electric TV sets
Just a tiny bit of air seeped in otherwise it would be arcing violently. Shame but this is how many of these died. John.
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4th Dec 2022, 3:41 pm | #63 |
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Re: English Electric TV sets
Hi John.
This was with no EHT connected (just the BK tube tester in "Test" mode) so I can imagine the light-display if I connected up 10KV.
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4th Dec 2022, 3:42 pm | #64 |
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Re: English Electric TV sets
Sorry to see this Mike, hopefully something can be done to substitute it. It may be worth looking up the old trade articles to modify it for a rectangular tube although suitable brackets and clamps will have to be fabricated.
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4th Dec 2022, 4:02 pm | #65 |
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Re: English Electric TV sets
Oh, I'm not beaten yet, Bren. The cabinet is still going off to a place in Solihull to be tarted up, the metal mouldings on the top and bottom are coming down to Devon to be sprayed, I'll get the gubbins sorted out myself and if a tube should reveal itself then so much the better. John said he might have something (even if there's a small chance of it working then that's great), I have a good T901 tube but that has a wider scanning angle so will need mechanical and possibly electrical modifications, and a pal of mine has a 15" Cossor tube and possibly the mask out of an earlier 1550 - so there are still plenty of opportunities to get the old girl going. And if all else fails then it'll make a nice-looking FM radio.
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4th Dec 2022, 4:25 pm | #66 |
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Re: English Electric TV sets
Hi Mike,
there's a Cossor 15" CRT upstairs but its only use would be to fill a hole in the set. Very dim picture. It came out from the Baird T23. Might be possible to locate a 15" mask. DFWB. |
4th Dec 2022, 4:27 pm | #67 |
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Re: English Electric TV sets
Good stuff Mike, there's certainly plenty of routes you can take with the 1550, the chassis is well suited for CRT modifications really so I'm sure you will get it sorted no matter which route you go for. Didn't mazda also do an all glass 15"? They'll probably be as flat as anything but maybe a good one may exist somewhere.
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4th Dec 2022, 4:41 pm | #68 | |
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Re: English Electric TV sets
Quote:
Picture below of the T900 vs the T901...
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4th Dec 2022, 4:44 pm | #69 | |
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Re: English Electric TV sets
Quote:
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4th Dec 2022, 4:50 pm | #70 |
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Re: English Electric TV sets
I have put my head in the loft and the T900 is sitting in a box on one of the shelves. It's very cold up there and I don't want to risk bringing it down into a warm area for testing. It might be the end of it! It's yours Mickey and I hope to test it soon, maybe take the tester into the loft! Regards, John.
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4th Dec 2022, 4:56 pm | #71 | |
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Re: English Electric TV sets
Quote:
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4th Dec 2022, 8:06 pm | #72 |
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Re: English Electric TV sets
Another closer view of that purple glow of doom...
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4th Dec 2022, 9:54 pm | #73 |
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Re: English Electric TV sets
Attachments show a Mullard MW41-1 that was once in a Bush TUG26.
The date code on the is base D3C, does that indicate the tube was not made in the UK? Those who know Philips manufacturing codes will know the origins of this tube. I've always had the suspicion these metal cone tubes were imported. You can see the attraction of metal cone tubes because of the almost flat screen. DFWB. |
4th Dec 2022, 11:47 pm | #74 |
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Re: English Electric TV sets
I'm not sure since different letters might be used. A few years later, the tube factory in Aachen, Germany used a square as factory symbol while for normal valves the D means Hamburg, Germany. 3C would be march 1953.
Out of curiosity, what's the type code (the other line of code) on this tube? |
4th Dec 2022, 11:54 pm | #75 |
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Re: English Electric TV sets
Hi Maarten, I'll take another look at the tube tomorrow.
DFWB. |
5th Dec 2022, 11:27 pm | #76 |
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Re: English Electric TV sets
The other line of the code appears to be "HT". Does that make any sense?
DFWB. |
7th Dec 2022, 11:57 am | #77 |
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Re: English Electric TV sets
Hello Micky,
Well it's good in parts! I brought it down from the loft and gave it a test. It is low emission but would definitely give a picture. The getter is fine. I will not reactivate it but leave it on all day to see if the needle moves a bit more to the right! It's here if you can't find anything better. Regards, John. |
7th Dec 2022, 12:27 pm | #78 | |
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Re: English Electric TV sets
Quote:
Thank you again John. Kind regards. From Mike.
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7th Dec 2022, 12:34 pm | #79 |
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Re: English Electric TV sets
Big Bertha doing her stuff! Looking forward to seeing a picture on this one Mike.
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7th Dec 2022, 2:23 pm | #80 |
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Re: English Electric TV sets
The MC tubes do give a good picture. This is a Ferguson 989T from 1951 fitted with a NOS Mullard 16" MW41-1. Brilliant and sharp but the camera shows poor interlace. It is in fact 100%. I think Ferguson sold many more receivers fitted with MC tubes than EE. They produced two models in quality cabinets the 989T was available with a solid oak cabinet.
The 16" 990T was fitted with a similar chassis to the 991T fringe chassis housed in a console cabinet with doors. |