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Phew. Being a member of the Phillips family (Mullard) had its exciting moments.

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Phew. Being a member of the Phillips family (Mullard) had its exciting moments.

Old 20th Jul 2020, 01:40
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Phew. Being a member of the Phillips family (Mullard) had its exciting moments.

Just browsing a radio restoration forum and put in a link to a fine old Mullard radio. This took me on to the EF50 Valve, one of which was rolling about on a shelf in my garage for more than 20 years. They were everywhere when I was a kid. I had no idea of its history. "As great an importance as the magnetron."

https://www.rafmuseum.org.uk/blog/sm...ect-big-story/
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Old 20th Jul 2020, 10:42
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Aaah!, the joys of 1154/55, MO/PA, vari Mu triodes, pentodes and the Type J switch ... or not! If only Marconi had stuck with his coherers!
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Old 20th Jul 2020, 11:50
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BBC 2 : Castles In The Sky
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Old 20th Jul 2020, 14:32
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It was not very long ago that I was watching Sir Bernard Lovell's account of his life, and it was somewhat surprising that he described how, at Astronomy convention in this century, he was talking with German Radio Astronomer who had been involved with investigating H2S from various shot down aircraft. Lovell commented on the worry of the Germans finding out about the cavity magnetron, only to be told that the Germans knew all about it, as it had been patented in Russia in 1930! The two cavity klystron of the Varian brothers led to the NR89 reflex klystron which was invented by Robert Sutton and his team at Bristol University, while the technique developed from producing the rhumbatron for that was used for making the TR cells which were such an important part of centimetric radar.

I saw a reference somewhere suggesting that the Japanese had a cavity magnetron in 1938, but had no technology for making a receiver even if they had thought about it.

Strange how history gets altered in popular belief, such as 'radar was a British invention', 'Armstrong invented the superhet radio receiver', 'George Stephenson invented the steam railway engine' and so on...
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Old 20th Jul 2020, 16:50
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Anybody know what
unaccessioned
means?

GPO transmitter at Daventry
A common misconception. The transmitters at Daventry were BBC. The GPO transmitter's location was known as Rugby, though it was a way out on the A5.

/Pedant mode OFF/
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Old 20th Jul 2020, 17:19
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Nice article. There's a much longer one by someone from Philips at the link below. Some of you may know about the EDSAC re-creation project at the computer museum at Bletchley. EDSAC was built almost exclusively with EF50s. (The leader of the project is a friend of mine and happens also to be a pilot, though afaik he isn't on PPRuNe).

https://www.dos4ever.com/EF50/EF50.html
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Old 20th Jul 2020, 17:39
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Originally Posted by n5296s View Post
Nice article. There's a much longer one by someone from Philips at the link below. Some of you may know about the EDSAC re-creation project at the computer museum at Bletchley. EDSAC was built almost exclusively with EF50s. (The leader of the project is a friend of mine and happens also to be a pilot, though afaik he isn't on PPRuNe).

https://www.dos4ever.com/EF50/EF50.html

There seem to be lots of errors in that article, from a quick read through it, ranging from Chain Home being described as "Home Chain" to getting the positions/grades of key Scientific Civil Service staff involved in radar development wrong. I suspect that if some of the basic stuff is in error, there may well be larger errors in the article too, so it might be worth going through it and perhaps getting the author to make some corrections.
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Old 20th Jul 2020, 17:45
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There seem to be lots of errors in that article
It's primarily about the Philips end of things, so not surprising they get the minutiae of the British end wrong. tbh I think it would be nicer to be grateful that people take the considerable time needed to write this kind of thing, than to snipe at them for not understanding the arcanities of the UK civil service grade structure.

Last edited by n5296s; 20th Jul 2020 at 21:01.
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Old 21st Jul 2020, 00:14
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I suppose Prince Charles is unaccessioned.

Well, my first read through had me excited. There should be an Acorn valve in this room somewhere, though "my stuff" seems to be automatically vanishing on a linear scale with a focal point of 90 years old. The Acorn conducted last time I tried it about 25 years ago.

The R1132A I bought one new, about 30/= My science master made me a PSU and rewound the coils but probably we never found all the faulty paper condensers. He commented how the flywheel dial would have cost at least thirty bob.

There were three masts at Bromley north-ish of Clacton. I'm not sure when (two of them) were taken down. I was surprised to find they were wood, for the same reason the Spruce Goose was wood, I suppose. My friend's dad was in the front of my Tiger, and complimented me on not flying between the masts. Not regs, but the thought of wires stretching between them that was off-putting.

EDIT. Seven. Four wood, three steel. Incredibly big. Great Bromley WWII masts.



Last edited by Loose rivets; 21st Jul 2020 at 00:36.
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Old 21st Jul 2020, 07:42
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Originally Posted by UniFoxOs View Post
Anybody know what unaccessioned means?
Easy - it's the opposite of accessioned.

Accession (verb): To record in the order of acquisition.
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Old 21st Jul 2020, 15:46
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All this talk of valves, reminds of an 80s joke about a new 16valve Skoda...8 in the radio!
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Old 21st Jul 2020, 16:44
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A fascinating report, and given the idiosyncrasies of the English language, non-native speakers can be forgiven for minor lapses. I particularly liked the 3rd member of a team to compliment the other two. There are times when I could have done with somebody around the place whose job was to say nice things about me, making a contrast to our Chiefy.

Somewhat on the subject, for a couple of months on an MU holding posting before a Squadron to do more interesting stuff, I was mostly changing wired in valves on (?) Green Satin (?) receivers. Happy to say goodbye to that bench.
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Old 21st Jul 2020, 20:28
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Four wood, three steel. Incredibly big. Great Bromley WWII masts
Great Bromley was one of the first Chain Home radar stations. The three steel masts were for the transmitter, with the aerial array hanging down between them; the wooden masts were for the receiver.

DaveReidUK is correct - most museums and archives have backlogs of material waiting to be formally brought on charge.
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