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, amde by MOS Technology, tot 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
Rev E B564 MI58
Rev F 2N5375
rev F 2N5375
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 G 2N4401
Rev G 2N4401
Rev F BC239C
Rev F 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.