[sdiy] Pin Outs

[David Ingebretsen]

I am not finding a data sheet (well, at least one with any extensive info)
or pin-outs for a couple of obsolete parts.

2N5163 n channel jfet
2n4891 UJT

The basic question is, is there a "hand test" I can do to determine the
pin-out for sure?

I have a simple circuit I could breadboard for the UJT, but nothing really
for the JFET.

I have some "replacement" parts which have appropriate pin outs printed on
the envelope they came in, but I also have some of the original vintage
parts which I would rather use.

The component packages between the original parts and the replacements are
different subtly.

To complicate matters, I have two vintage version of the 2n5163, in similar
but different packages, one is a TO-106 I think with a flat side by one pin,
one does not have a flat on it at all.

JFET:
                           .   apex
Pins are in a triangle   .   .   base of triangle

Package 1: TO-106(?) round with round top flat is offset adjacent to one of
the pins (vintage)

                        .
                 Flat .   .

Package 2: TO-106(?) round with round top, flat opposite middle pin,
parallel to base of the triangle (new replacement)


                        .
                      .   .
                       Flat

Package 3: TO-106(?) round with round top, no flat (vintage)

UJT

Pins are in a triangle, metal housing with a tab
Package 1: TO-18(?) tab between triangle apex pin and a triangle base pin
(new replacement)

                    .
              tab .   .

Package 2: TO-18(?) tab at an angle, but is between the two triangle base
pins.

                    .
                  .   .
                  tab

I found some old schematics which suggest two different pin-outs for the
JFET, Source, Gate, Drain, and Source, Drain, Gate, both suggesting a TO-106
round top package was used, but I'm not sure.

I have struck out completely on the UJT. Believe me, I have searched every
internet datasheet archive I could find.

I have a simple schematic for the UJT which I guess I can breadboard and try
the replacement I know the pin-out for and then try an old part to see. But,
I'm a bit at a loss for the JFET.

Thanks
David