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Forum Index : Electronics : Looking for AC187/AC188 transistors....

Posted: 05:38am 23 May 2026 Copy link to clipboard	Grogster Admin Group

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!

Posted: 06:14am 23 May 2026 Copy link to clipboard	Godoh Guru

Seems to be some on ebay

AC187

AC188

Posted: 07:42am 23 May 2026 Copy link to clipboard	Grogster Admin Group

Yeah, but I don't trust ebay.

Many of their parts are FAKE.

I want GENUINE replacements.

But thanks for posting!

Posted: 08:03am 23 May 2026 Copy link to clipboard	Revlac Guru

Apparently there are a few forums around that play with this old gear.
Not sure if its much help, it links to another page etc.
https://www.vintage-radio.net/forum/showthread.php?t=188664

Posted: 10:00pm 23 May 2026 Copy link to clipboard	Pete Locke Senior Member

Michael Dranfield would be worth asking.
Cheers
Pete'
Hokitika.

Posted: 11:48pm 23 May 2026 Copy link to clipboard	Grogster Admin Group

Lovely, thanks.

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