Carnhill 10468 Screw size [email protected]$%#!
« Reply #20 on: June 20, 2007, 09:58:46 PM »
I've got an old greenie and the same screws from that work in the Carnhill i got from the group buy.  The last number for the code is unclear but it's deff. marked St. Ives 10468


SeventhCircle

Carnhill 10468 Screw size [email protected]$%#!
« Reply #21 on: June 20, 2007, 10:01:41 PM »
The new Carnhills are definitely #4-48.  They're not too hard to find, in the Bay Area a good source is Olander in Sunnyvale.  Not positive about the original Marinair spec, but M2.5 fine pitch seem to work fine.  You won't get a #4-48 into one of the old Marinair holes.

Carnhill 10468 Screw size [email protected]$%#!
« Reply #22 on: June 20, 2007, 11:34:07 PM »
Mine may have been butchered or um, re-tapped.  I doubt someone would tap a 4-48 thread though.

rascalseven

Carnhill 10468 Screw size [email protected]$%#!
« Reply #23 on: June 21, 2007, 11:18:39 AM »
I don't know what the proper screw size is, though I've been told it is an obsolete British standard that is difficult to source.  It is VERY close to a 4-40, however, so I bought a 4-40 tap and just re-tap them for my builds.

I've had no problems with this... works great.

JC
"If you dig the gig, do it. -But listen to the signal, not the person talking."  -Keef

madriaanse

Carnhill 10468 Screw size [email protected]$%#!
« Reply #24 on: June 21, 2007, 11:23:46 AM »
Damn...  2 pages about a thread size! :shock: The official thread size is: 6BA Imperial - from the mouth of Carnhill.

M.

tommypiper

Carnhill 10468 Screw size [email protected]$%#!
« Reply #25 on: June 21, 2007, 11:33:02 AM »
Thanks, Martin.  I believe 6BA is correct.  Geoff Tanner told me something like that once.  The BA stands for British Ass. Standard... or along those lines.  :grin:

Yes, the original thread is obsolete!  Let's agree on that.  

Weird that Carnhill switched to #4-48 threading...
and weird that some people say the #4-48 works in old original iron but Tim says it doesn't.  Can someone test it please?  Why would Carnhill switch to #4-48...?

Never heard M2.5 might work, thanks, Tim.

Otherwise we can always do what JC does and tap 4-40...

Whew.
Imagine a wet, slightly chilled from its gas release and decompression, with water droplets condensing, sucking surface tension, slowly sliding down the side, capped by a healthy virgin froth on top..

madriaanse

Carnhill 10468 Screw size [email protected]$%#!
« Reply #26 on: June 21, 2007, 11:58:37 AM »
Hi Todd,

I'm not sure Carnhill ever switched to 4-48, but have a look at the specs for 4-48 and 6BA:

6BA major diameter 0.1102", pitch 47.9 tpi
4-48 major diameter 0.1120", pitch 48 tpi

perhaps this explains why they're pretty much compatible.

(are we at 3 pages yet?  :grin: )

Take care,

M.

Carnhill 10468 Screw size [email protected]$%#!
« Reply #27 on: June 21, 2007, 01:16:42 PM »
Quote from: "tommypiper"
.  The BA stands for British Ass. Standard...



...as in what British ASS thought of this as a standard....

-sounds about right :green:

CJ

If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

tommypiper

Carnhill 10468 Screw size [email protected]$%#!
« Reply #29 on: June 21, 2007, 10:10:17 PM »
Quote from: "guavatone"
Quote from: "tommypiper"
.  The BA stands for British Ass. Standard...



...as in what British ASS thought of this as a standard....

-sounds about right :green:


Exactly.  :grin:  Just what I was hinting at... Of course CJ provided the answer. 'Twas Mr Whitworth...

Here's actually the link to the BA threads. http://en.wikipedia.org/wiki/British_Association_screw_threads
Imagine a wet, slightly chilled from its gas release and decompression, with water droplets condensing, sucking surface tension, slowly sliding down the side, capped by a healthy virgin froth on top..


tomelectro

Carnhill 10468 Screw size [email protected]$%#!
« Reply #30 on: June 22, 2007, 01:11:38 AM »
Intresting stuff - thanks!  I've used 4-48 on vintage Neve front panels as well, but I bet they were also 6BA to begin with.

EDIT: oops - looks like I've bumped it into a 3-page thread   :grin:

Carnhill 10468 Screw size [email protected]$%#!
« Reply #31 on: June 22, 2007, 01:46:20 AM »
woo whooo! 3 pages of a thread on threds!

I think tom deserves a prize....
...of course it would be a long screw :green:

HappyTom

Carnhill 10468 Screw size [email protected]$%#!
« Reply #32 on: June 23, 2007, 05:55:11 AM »
come on guys!
3:rd page and noone ever searched for "6ba" at RS Components?

HT

tommypiper

Carnhill 10468 Screw size [email protected]$%#!
« Reply #33 on: June 23, 2007, 12:21:44 PM »
It's not practical to buy from RS in the states.  I think most of us never look for anything at RS.  Those in Europe do, but you can already get BA screws via the UK anyway.
Imagine a wet, slightly chilled from its gas release and decompression, with water droplets condensing, sucking surface tension, slowly sliding down the side, capped by a healthy virgin froth on top..

BladeSG

Carnhill 10468 Screw size [email protected]$%#!
« Reply #34 on: October 09, 2008, 06:28:59 PM »
Anyone try a 2.5mm drill bit and a M3 taper tip tap on these?

BladeSG

Carnhill 10468 Screw size [email protected]$%#!
« Reply #35 on: October 10, 2008, 03:44:43 AM »
Quote from: "BladeSG"
Anyone try a 2.5mm drill bit and a M3 taper tip tap on these?


I just did it without the drill bit (too worried about the softness of brass)..... worked like a new one  :thumb:


 

Related Topics

  Subject / Started by Replies Last post
2 Replies
2271 Views
Last post September 08, 2006, 11:06:26 AM
by matta
1 Replies
1923 Views
Last post January 15, 2009, 07:14:39 PM
by Tim Campbell
2 Replies
1550 Views
Last post May 19, 2011, 07:04:30 AM
by barney
18 Replies
2004 Views
Last post November 12, 2019, 08:31:21 PM
by Delta Sigma