[Milsurplus] [MIT-Rad-Lab-Books] PF tubes

[J. Forster]

> John, if you have contact with Mr. Krim it would be great to ask him
> about tube numbering versus coloured dots.

I will try and ask.

Best,

-John

===========

> If anyone can pull the tubes section from the Rad Labs vol 17 that would
> help Jan.  I should think that vol 17 is a large file.
>
> When I sent the info I have to Jan, I told him about my copy of that
> Baldwin
> book. The section "Rugged Tubes" does not seem to contain any part numbers
> at all. I haven't spotted any numbers in a quick look at the rest of the
> book either. [I don't have a copy of "They Didn't Know what Hit Them " and
> by using the views in Google Books, they seem to be different books; not
> just a change of title.]
>
> To Jan I said, ":when I looked in the Components Handbook [volume 17 of
> the
> 28 vol Rad Labs series].
> The tubes section was written in 1946 even though the book was published
> around 1949.
> It states that the PF tubes were still classified.
>
> It does give details of some other sub-miniature tubes though. "
> This means that the numbers given in that volume could be assumed to be
> NOT
> I suppose PF/VT tubes .
>
>
>
> Here is a summary of emails in case there is some interest even though it
> is
> off-topic for the group.
> One radar book used a photo of a submini :- to Jan I sent
> "In addition to the GEC info I sent, I have found in a book arrived today
> [Radar origins Worldwide, R C Watson] a picture of a Western Electric 5672
> labelled " VT Fuse Tube Compared with Matchstick "
>
> The GEC War Diary book gave some details of a CV number and some referred
> to
> by engineering E- number.
> To Jan also, "I have checked books The Deadly Fuze [Baldwin] 1980, New
> Weapons for Air Warfare [Boyce] 1947 , Scientists Against Time [Baxter]
> 1948
> , without any specific tube numbers seen." Didn't find anything in
> Guerlac's
> two volumes either.
>
> The British official Electronic Valve Specification sheets for some of the
> CV  PF/VT and torpedo tubes have in their K1001 specification box that
> there
> is no need to mark identification numbers on those CV tubes. [Also
> described
> on Jeremy's web site.
>
> I sent to Jan:-
> "Many of the midget valve types were used in missile-carried devices in
> later
> years. The missile-carried valves still had to be quite rugged.
> The CV4000-series valves are rugged/high-reliability types with higher
> specs
> for the vibration etc. Many of the tiny valves there have approx 500g
> short/
> 2.5 to 5 g long duration ratings only.
> eg  http://www.tubecollector.org/cv4094.htm
>
> And... http://www.tubecollector.org/cv4508.htm
>
>       Max vibration (100 hours max) 5g
>       Max vibration (10 mins max) 20g
>       Max shock (short duration) 500g
>
>
>
>
> In particular see Jeremy's CV122 page
> http://www.tubecollector.org/cv122.htm
> "Fuse valves had a very short operational life. The EVS sheet for the
> CV122
> states that the valves are required for use in receivers and for short
> period of operation. There is no requirement to replace them or for them
> to
> have a normal lifespan. They need a long life in storage.
>
> There is no CV number marked on the valve. Again, the EVS sheet gives a
> clue
> as it excludes the section in K1001 that requires this to be marked. The
> valve carries the number 476 with an 'E' underneath. "
>
> The EVS [Electronic Valve Specification] sheet specification for marking
> is
> a very important point !  "
>
>
> See also:-
> http://www.tubecollector.org/equipment/proximity-fuse.htm
>
> http://www.tubecollector.org/cv61.htm
>
>
> ----- Original Message -----
> From: J. Forster
>
> ....clip......
> There was a book... The Deadly Fuze... about the PF.
>
> The book was also turned into a PBS Nova episode. You can probably view it
> by searching the PBS.org site.
>
> The tubes were made by Raytheon in Massachusetts. The gentleman that ran
> the plant still lives locally, Norm Krim.
>
> There was a movie made of the plant, just before it was shut down, by the
> MIT Industrial Liason Office. That movie was available for viewing on
> TechTV.edu (possibly .com or .org)
>
> ....clip.....