Distance on pins for PCB-socket versus solder-lug socket?

[Dekatron42]

Hi all,

I am trying to discern what distance is really necessary for a B27A & B26A sockets when they should be made with Nixie-pins on a PCB, the B27A pin socket is used for GSA10G and the B26A is used for Burroughs BX-1000 series of tubes.

The original PCB mounting socket that I've seen have at least 5 millimeter between the pins as they are bent outwards and longer than the standard straight Nixie sockets used for PCB mounting. getting the same spacing with Nixie pins would require that I bend the Nixie-pins and that would complicate things like mounting. The original B26A socket has some 3.17 millimeter between the outer pins (17 pins (actually 18 but one unfilled position) with an 18.2 millimeter diameter) and 3.87 millimeter between the inner pins (9 pins with an 11.1 millimeter diameter). The B27A socket has an extra pin in the center which is the anode with some 500V on it and that sits approximately 5mm from the inner ring with pins. Now I I haven't taken into account the solder pad size for these figures so the distance between solder pads makes the actual distance shorter, for the Anode on the B27A socket I can solder a wire so i wouldn't have to route it between the other pins, but for the B26A socket I would like to route the wires between the pins making the distance even shorter between solder pads and wires.

The Burroughs tubes has a maximum of 300V between the pins and the GSA10G has some 240V between main Anode and a Cathode and some 225V on the Auxilliary Anode when running.

Any help is highly appreciated!

/Martin

[David Forbes]

Martin,

First, do not bend the pins on the tube. I cannot tell what exactly is your concern. Is it the gap between pads for high voltage creepage? You can maximize this by using an oblong pad.

If you have any solder tail sockets, you can use those. I made a bunch of Nixie clocks in the olden days, using the B13A solder tail sockets on PC boards. I used a trick of trimming the solder ring longer on one side and shorter on the other side, to convert these sockets to fit in a PC board. I made a custom pattern with a slight angular offset to handle this. 

--
You received this message because you are subscribed to the Google Groups "neonixie-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+...@googlegroups.com.
To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/a4d01383-2fa7-48e3-8912-685c478c4281%40googlegroups.com.

[Dekatron42]

I wouldn't bend the pins on the tube, the glass is way to brittle for that.

Do you have any photo of how you did trim the sockets?

/Martin

To unsubscribe from this group and stop receiving emails from it, send an email to neoni...@googlegroups.com.

[David Forbes]

Martin,

Here is how I cut the tube socket pins to fit in PC board holes.

--

You received this message because you are subscribed to the Google Groups "neonixie-l" group.

To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+...@googlegroups.com.

[Dekatron42]

Thanks!

That was a nice way of getting greater creepage distance.

I'll see what can be done with the original solder lug sockets that I have for these.

/Martin