Thanks for the suggestion, but these are not pcb mounted
sockets.  They are chassis mount sockets.  They have a
thin flange which has two small holes for screws.  They
have a phenolic base which the flange is fastened to.
The phenolic base has the ring of holes into which the socket
pins fit.  The underside of the pins have solder eyelets.

The pins are somewhat free to float around a bit to accommodate
any slight misalignment of the tube's pins with the socket's
pins.   The killer sockets have less of this available slop.

The good sockets have pins made of thinner, more flexible
spring metal, and the good ones are also more forked shaped.

The killers are made of thicker, less springy material, and
they are not as nicely forked shaped, they are more cylindrical
and so tend to capture the tube pins more severely.

Chuck

---- Original Message ----
From: [email protected]
To: [email protected]
Subject: Re: [neonixie-l] Looking for NL-6844A
Date: Mon, 7 Nov 2011 10:51:28 +1030

>When you solder sockets to a pcb, you need to have a dummy plug [they
>were 
>used for normal valve work] or a 'standard' nixie plugged in. The
>socket 
>pins [of good sockets] can move around a bit. Before pcbs it didn't
>matter 
>so much. With ordinary valves there are specialised sockets for pcb
>use. ... 
>maybe your sockets are not specifically for pcb?
>For nixies, the accuracy of the pcb holes is very important.
>Use a dummy plug or expendable 'standard' Nixie to align the socket
>pins.
>
>John K
>Australia
>[I had a pic of dummy plug in Yahoo nixie folders somewhere].
>
>
>
>
>----- Original Message ----- 
>From: "chuck richards" <[email protected]>
>....clip....
>.   I had a modest few of these tubes only
>> to find out that certain sockets tend to break them!!!
>>
>> So, I ended up with just enough NL-6844A tubes to get by.
>>
>> Has anyone else ever ran into this issue with certain
>> kinds of those sockets having pins which restrict the tube pins
>> and put such force on them so as to cause the glass of the
>> tube base to break?   I found out later by carefully examining
>> two different versions of that socket that the good ones
>> have nice flexible forked pins and the tube-killer sockets
>> have pins that are much thicker and more cylindrical. less
>> like a nice fork.
>>
>> Thanks,   Chuck Richards
>>
>
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