811a top cap size

If they glow, this is the place to be
Post Reply
User avatar
pre65
Amstrad Tower of Power
Posts: 17600
Joined: Wed Aug 22, 2007 11:13 pm
Location: North Essex

811a top cap size

Post by pre65 » Thu Oct 13, 2011 9:48 am

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"
Life is what happens to you while you're busy making other plans. John Lennon

G-Popz THE easy listening connoisseur. (Philip)

User avatar
Toppsy
Shed dweller
Posts: 2142
Joined: Mon Jul 23, 2007 12:10 pm
Location: red rose country
Contact:

Post by Toppsy » Thu Oct 13, 2011 12:41 pm

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

User avatar
pre65
Amstrad Tower of Power
Posts: 17600
Joined: Wed Aug 22, 2007 11:13 pm
Location: North Essex

Post by pre65 » Thu Oct 13, 2011 12:45 pm

Thanks Colin.

I'm now fairly sure it is the 9/16" sized ones, so HFC here I come. :)
Life is what happens to you while you're busy making other plans. John Lennon

G-Popz THE easy listening connoisseur. (Philip)

User avatar
Toppsy
Shed dweller
Posts: 2142
Joined: Mon Jul 23, 2007 12:10 pm
Location: red rose country
Contact:

Post by Toppsy » Thu Oct 13, 2011 12:46 pm

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

User avatar
pre65
Amstrad Tower of Power
Posts: 17600
Joined: Wed Aug 22, 2007 11:13 pm
Location: North Essex

Post by pre65 » Thu Oct 13, 2011 12:49 pm

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" :)
Life is what happens to you while you're busy making other plans. John Lennon

G-Popz THE easy listening connoisseur. (Philip)

User avatar
Mike H
Amstrad Tower of Power
Posts: 18273
Joined: Sat Oct 04, 2008 5:38 pm
Location: The Fens
Contact:

Post by Mike H » Thu Oct 13, 2011 4:31 pm

Also, 0.027 Egyptian royal cubits.
 
I never make the same mistake twice. Instead I prefer to fill my day with a variety of different mistakes

User avatar
pre65
Amstrad Tower of Power
Posts: 17600
Joined: Wed Aug 22, 2007 11:13 pm
Location: North Essex

Post by pre65 » Thu Oct 13, 2011 4:48 pm

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.
Life is what happens to you while you're busy making other plans. John Lennon

G-Popz THE easy listening connoisseur. (Philip)

User avatar
Mike H
Amstrad Tower of Power
Posts: 18273
Joined: Sat Oct 04, 2008 5:38 pm
Location: The Fens
Contact:

Post by Mike H » Thu Oct 13, 2011 9:25 pm

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
 
I never make the same mistake twice. Instead I prefer to fill my day with a variety of different mistakes

Post Reply