811a top cap size

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pre65
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#1 811a top cap size

Post by pre65 »

Can anyone confirm the 811a top cap size ?

Data sheets list it as medium, but other web sites suggest it's large.

I have 3/8" to hand but the bigger 9/16" I don't.

9/16" = 14.3mm = 0.56"
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#2

Post by Toppsy »

Phil the data sheet I have says it's a JEDEC No C1-5. If that means anything to anyone?

Here's the link to the datasheet. Dims of valve on page 6
http://www.mif.pg.gda.pl/homepages/fran ... 8/811A.pdf
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#3

Post by pre65 »

Thanks Colin.

I'm now fairly sure it is the 9/16" sized ones, so HFC here I come. :)
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#4

Post by Toppsy »

Phil,
to add confusion the Amperex data sheet for 811 says it's 0.566" +/- 0.007"

Link to datasheet, see page 2 : http://tubedata.tigahost.com/tubedata/s ... /8/811.pdf
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#5

Post by pre65 »

Toppsy wrote:Phil,
to add confusion the Amperex data sheet for 811 says it's 0.566" +/- 0.007"

Link to datasheet, see page 2 : http://tubedata.tigahost.com/tubedata/s ... /8/811.pdf
Yep, that's right Colin.

9/16" = 14.3mm = 0.56" :)
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#6

Post by Mike H »

Also, 0.027 Egyptian royal cubits.
 
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#7

Post by pre65 »

Mike H wrote:Also, 0.027 Egyptian royal cubits.
Not exactly, cos the Egyptian Royal cubit was between 523mm and 529mm so not an EXACT length. :wink:

Have you got a very old exercise book with all those defunct measurements on the back cover ? :wink:

I think the railways still use miles and chains (66 feet - 80 per mile) for measuring distances.
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#8

Post by Mike H »

Nah 'twas Google.

No not exact, so I opted for 526 as an average. :D

Shame about the royal cubit, our dimensions could have been written with a touch of class
 
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