Transistors in the KIM-1 – Retro Computing

Even a microprocessor based computer as the KIM-1 required some simple transistors.
To drive the LEDs some extra current is needed, so there are 6 PNP transistors there.
And in the serial circuit an NPN transistor is used.

The User manual states:

 --------+-------------------+------+---------------------------------------
 | ITEM  | PART              | QTY. | DESCRIPTION                          |
 +-------+-------------------+------+--------------------------------------+
 |  18.  | Q7                | 1    | NPN Transistor B>20, VCE>12 - 2N5371 |
 |  19.  | Q1 through Q6     | 6    | PNP Transistor B>20, VCE>6  - 2N5375 |
 --------+-------------------+------+---------------------------------------

which are quite generic general purpose transistors.

This is what I found in my KIM-1s. The first ones, made by MOS Technology, to Rev B, used the 2N5371 and 2N5373. Thereafter it seems any useable and available transistor was used.

Q1 tot Q6 LED drivers PNP general purpose transistors

First edition 2N5375
Rev A 2N5375
Rev B 2N5375
Rev D B564 MI58 (which actually is a 2SB564)
Rev E B564 MI58
Rev F 2N5375
Rev F BC327
Rev G 2N4403
Rev G 2N5375

Q7 serial circuit NPN general purpose transistor

First edition transistor missing in action, only a socket!
Rev A 2N5371
Rev B 2N5371
Rev D 2N3904
Rev E 2N3904
Rev F BC239C
Rev F 2N4401
Rev G 2N4401
Rev G 2N4401

On the Rev D Replica by Eduardo Casino and the Nachbau KIM-1 by Ralph02 the BC327(2N5375) and BC338(2N5371) are used.
The Micro-KIM and PAL-1 and PAL-2 use the 2N4401 and 2N4403.
The KIM-1 Reproductions by Dave Williams a BC338 and MPSA92.