for the substitution of modern transistors in elderly projects
The links at left may help you to research your own replacement
transistors. Should you find any info that can fill in any of the blanks in the
matrix below... Please Email the details so that I can update them in and thus help
This page was stalled, pending the finding of more complete data, but an English
gent, George Hurley, now living in New Zealand, has provided all the missing information... Thanks.
The Apidictor was designed in the early 1950s and contained three
types of transistor, each of which could be of two specified types, but none of
these are in general supply as of the early 2000's.
|tr1 or tr2||OC 202||OC 702||2N 1475||BCY 32|
|tr3 or tr4||AC 107||NKT 226||AC 107N|
|tr5 to tr11||OC 71||NKT 224||2N 406||AC 1077|
There are still a few gaps, but there is enough information
in these tables to be able to compare modern transistor specifications,
so that these old items can be kept functioning.
Written... 22 April 2004,
Upgraded... 03 May 2005,