[ARC5] 4 pin to 7/9 adapter update
Jim Wiley
jwiley at gci.net
Sun Nov 2 19:14:06 EST 2014
Ben -
Congratulations on your progress so far. Assuming that you can
successfully negotiate with small job manufacturers for the "pins" and
PC boards, will you be considering making available similar items for
old style 5, 6 and 7 pin bases as well? That could go along way toward
helping those who are trying go get old sets going, but are frustrated
by non-availability of the tubes themselves.
One additional comment: Consider making a connection point available
that could be used to simulate a grid-cap. That is to say, a solder pad
where a wire could come from the base of a more modern tube up and
around the side of the tube to make the grid connection.
- Jim, KL7CC
On 11/2/2014 12:57 PM, Ben Hall wrote:
> Afternoon all,
>
> Been a productive weekend. I modified the design a bit so that one
> board design could accommodate both a 7-pin and a 9-pin mini socket.
>
> <http://www.kd5byb.net/BC230/7and9.jpg>
>
> The design now has the pins soldered to the PC board, which should be
> better in the long run compared to superglue.
>
> I built a jig for cutting the brass tube "pins" to length and built a
> second jig to hold the pins in alignment while the PC board is
> soldered in place.
>
> I have a design almost complete that will allow a short-run board
> house to manufacture the PC board portion. Installation of the pins
> will still be a hands-on operation, but at least I'm not etching the
> boards by hand! ;)
>
> The commercial PCB will also have dedicated pads for attaching wires,
> unlike the current prototype where one would have to solder to the
> pins, which might throw off their alignment.
>
> Fabricating the brass "pins" is a rather slow operation. I've got two
> drawings off to a short-run manufacturer to see if they can build the
> pins for a price point that beats me using a hack saw and hand files. ;)
>
> thanks much and 73,
> ben, kd5byb
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