Replacement tube for IBM 026 Printing Card Punch

From: Dwight K. Elvey <dwightk.elvey_at_amd.com>
Date: Tue Jun 4 20:07:45 2002

Hi
 Look at the wiring. If it looks similar to what is on the other
25L6's, you should be OK. You should check the grid voltages
on all of these tubes. Incorrect bias can cause excess plate
disapation. This will shorten the tube life to minute/hours.
See below for pinout:

http://www.nostalgiaair.org/scripts/showbase.dll?TYPE=25L6&BASE=7AC

later
Dwight



>From: "Sellam Ismail" <foo_at_siconic.com>
>
>
>So I'm off to look for a 25L6 tube for my IBM 026. John Lawson says that
>the tube is a 25L6 because all the other tubes in the rack are 25L6 types
>and he believes they are hammer drivers. Not to doubt the venerable
>Mr. Lawson, since he did used to service these, but I just want to make
>sure this is in fact the right tube type that goes into the socket that is
>currently empty. See photo here:
>
>http://www.vintage.org/gallery.php?title=IBM%20026%20Printing%20Card%20Card%20P
unch&grouptag=IBM026
>
>I'd hate to plug in the wrong tube and then witness volumnious
>amounts of smoke billow from within the machine. Can someone verify that
>the 25L6 is indeed the correct tube for the empty socket?
>
>Thanks!
>
>Sellam Ismail Vintage Computer Festival
>------------------------------------------------------------------------------
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>
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>
Received on Tue Jun 04 2002 - 20:07:45 BST

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