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Transistor Equivalents
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 everyone else.

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.

Schematic ref.	Original transistor type	Original alternative type	Modern Substitute	Alternative Substitute
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

Parameter chart

Type	Case	NPN or PNP	Mat^L	Vce V	Vcb V	Veb max V	Ic mA	Hfe min	Hfe typ	Hfe max	Ic @ Hfe mA	ft MHz	Ic @ ft mA	Ptot mW	T_junc C max	Use
AC107	TO1	P	Ge	15	15	10	10	30	-	160	3	2	3	80		L.N. Audio
OC71	TO1	P	Ge	10	30	10	50	30	-	75	5	6	<1	125	80	Audio GP
OC202	TO1	P	Ge	15	10	10	50	40	-	-	1	1	-	250	150	-
NKT 224	TO5	P	Ge	30	10	10	500	30	-	-	1	0.5	-	300	85	-
NKT 226	TO5	P	Ge	30	10	10	500	50	-	-	1	0.5	-	300	85	-

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.

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Written... 22 April 2004, Upgraded... 03 May 2005,

Transistor Equivalentsfor the substitution of modern transistors in elderly projects

Written... 22 April 2004, Upgraded... 03 May 2005,

Transistor Equivalents
for the substitution of modern transistors in elderly projects