Looking for AC187/AC188 transistors....

Author	Message
Grogster Admin Group Joined: 31/12/2012 Location: New Zealand Posts: 9995	Posted: 05:38am 23 May 2026       I have an old 70's amp here(PYE 554-P radio-gram), with blown output transistor pairs on both channels, so I am looking for two each of AC187 and AC188. I understand these are EXTREMELY rare these days, so I am happy to consider equivalents if anyone knows of sets that could be used. They are Germanium transistors, so need to be the same type because the bias of the amp will be set for 0.2v Germanium type, and standard silicon with 0.6v would require adjusting the bias, and it appears to be fixed on this amp - no bias trimmers. Smoke makes things work. When the smoke gets out, it stops!