Transistor part# 043-924 (photo)

lowredmoon

Active Member
If you have any knowledge about this transistor, please share.
I have a set of these that came out of an MC2105. I'm trying to ID them beyond the Mc part number. If they're original to an MC2105, they should be suitable for my Mac1900, but I don't have enough data to be comfortable with that.

I've searched the Web quite a bit, and have found no reference.

Thank you for your input.
 

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043 would be the last 3 digits of a Mac part number.....132-043 for a output transistor.

I do have to question why someone would care to reuse a 40 year old transistor with a questionable history when a modern replacement is available from dozens of suppliers. The onsemi 15003 has been used as the go to replacement for over a decade.

Replacing all in the affected channel is wise.
 
I do have to question why someone would care to reuse a 40 year old transistor
A fair question. It's simply an attempt to keep things near-original. I admit - more of a pursuit of fancy than logic.
Thank you for resolving the part number question.
 
c-dk has very well explained
070-xxx are diodes
131-xxx are triac or dias
132-xxx are transistors
133-xxx are IC's
when you read "043" you should immediately understand "132-043"
This is an official MCINTOSH part number
132-043 is no longer available since 30 years and replaced by 132-070
132-070 is 2N5303 NLA since a long time too and replaced by 132-188
132-188 (made by RCA) is now a MJ15003
If you have to replace TR you should replace all by the same model in once , same for the other polarity (132-189 = MJ15004)
 
Thank you for clarification, Patrice. I'm surprised I didn't catch that.
I replaced all four transistors with McIntosh supplied MJ15003G. It runs much cooler now, and unless I'm imagining it, the sound is more balanced.
This is my first "Mac," and I'm in love with the sound!20180415_180529.jpg 20180414_202933.jpg
 
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