[ARC5] Four pin VT-25/52 to nine pin miniature adapter prototype

[Ian Wilson]

One of the more creative tube basing conversions I have seen
is a National Union (read: sleaze) that is pretending to be a 7360.

It is really a 6JH8 (or one of the family) with the pin incompatibility
resolved by having its pins cut very short, and being mounted on
a circular PCB which reroutes some of the tube connections to
pins anchored in the PCB.

Interestingly enough, in a circuit with component values for the 7360
the National Union lookalike worked identically(!).

73, ian K3IMW


On Thu, Oct 16, 2014 at 4:32 PM, Ben Hall <kd5byb at gmail.com> wrote:

> Hi Mike and list,
>
> On 10/16/2014 2:25 PM, mstangelo at comcast.net wrote:
>
>> Nice!
>>
>
> Thanks much.  :)
>
>  Where did you find the 4 pin plug?
>>
>
> It is custom made in my garage.  ;)  The round disc is a piece of rather
> thick PCB board, cut out with a hole-saw, with the copper layers removed,
> drilled for the pins using a template on a drill press.
>
> The pins are made from brass rod, cut to length and filed to be more or
> less round on the ends.  I say "more or less" as I did it by eye with a
> file.
>
> thanks much and 73,
> ben
>
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