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13th January 2007, 08:34 PM
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#1 |
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diyAudio Member
Join Date: Mar 2006
Location: VA
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EMI tubes (British made)
EMI tubes (British made)
I have a question about EMI tube/valve manufacturing. I found an EMI photomultiplier tube (PMT) in my Perkin Elmer 202 UV-Vis spectrophotometer and it says it was made in England. Did EMI make any other tubes, such as audio tubes? Did EMI actually make tubes or did they just relabel tubes made by other companies, ie. Mullard tubes? Is this the same EMI that made the plate reverb system and was/is involved in the recording industry? You can see the partly faded EMI logo in the picture below. On the tag it says: Type 9592B S/No. 27119 MADE IN GREAT BRITAIN Near the pins is another tag taped to the tube that is that says: 27119 There's also some brown-black writing on the glass envelope that says: EMI ELECTRON CS LTD. VALVE DIVISION BURY STREET RUISLIP MIDDLESEX MADE IN ENGLAND More pictures here http://www.geocities.com/antiquesci/PE124/EMI-PMT.html |
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13th January 2007, 08:48 PM
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#2 |
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diyAudio Member
Join Date: Mar 2006
Location: VA
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I put the pictures here, too.
http://www.flickr.com/photos/98366157@N00/ |
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14th January 2007, 08:59 AM
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#3 |
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diyAudio Moderator Emeritus
Join Date: Jan 2003
Location: Near London. UK
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Yes, it's Electrical & Musical Industries. Yes, they made valves. PMTs are rather specialised, and used to be used extensively in broadcast television for transferring film to television (telecines). If EMI bought any valves in, they would have been from firms they had a television link such as RCA or Marconi-Osram (the 405 line television system was originally known as the Marconi-EMI system).
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14th January 2007, 06:01 PM
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#4 |
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diyAudio Member
Join Date: Mar 2006
Location: VA
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Wiki and history of EMI
http://en.wikipedia.org/wiki/EMI http://www.emiclassics.com/centenary/history.html |
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11th February 2007, 10:22 PM
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#5 |
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diyAudio Member
Join Date: Mar 2006
Location: VA
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I found some EMI patents that are relevant to what I'm talking about. You can look them up here:
http://ep.espacenet.com/numberSearch?locale=en_ep http://www.pat2pdf.org/ (need Adobe Acrobat Reader) US 3039016 Electrodes PMT EMI US 2001005 Method of and means for recording sound EMI US 2100259 Television EMI US 2107519 Electron discharge device EMI US 2124394 Picture and sound transmission EMI US 2210034 Electron multipler EMI US 2786888 Deflection and accelerating voltage correction circuits for flying spot film scanners EMI US 2836755 Electron multipliers EMI US 2841728 Electron multipliers EMI ----------------------------------- These plate reverb patents were assigned to another company. US 2923369 Acoustic reverberation arrangements plate US 3719905 REVERBERATION DEVICE plate, theory, reduced dimensions -------------------------- Some spring reverb patents if anyone's interested. US 2982819 Artificial reverberation apparatus hanging springs US 3106610 Artificial reverberation unit springs |
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