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Old 2nd September 2012, 02:03 PM   #1
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Default Please help ID output transistors in Crown D150A

Good day, folks.

I an helping a friend refurb a D150A to use to bi-amp some Kappa 9's. Fresh 'lytics, update the op-amp, replace the carbon resistors with metal film, new and larger filter caps. Just a basic rebuild.

I have been digging on the web and cannot find the transistors that are physically in this amp. I have seen posts that state they are 2N3773 but that does not match either the service manual (2N5631) or what is in the amp. I bet they are service replacements but I cannot find datasheets.

So, if possible, we would like to change them to newer, faster devices and still be stable in circuit. Any and all help appreciated!

2x Motorola 3990
2x (No Mfr.) 3941
Drivers: 4x RCA 3295 (Manual lists 2N3585 NPN)
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Old 2nd September 2012, 03:19 PM   #2
jaycee is offline jaycee  United Kingdom
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The part numbers on them are Crown part numbers. The channel with 3990 are Motorola 2N5631, the channel with 3941 seem to be some selected Fairchild transistors. I guess this was back in the days of power transistors being exotic, tricky devices.

I wouldn't recommend substituting anything too modern in here - it'll probably just oscillate. OnSemi (Motorola's spinoff company) recommend MJ15015 devices. Maybe MJ15024. I wouldn't risk MJ21194.
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Old 2nd September 2012, 04:37 PM   #3
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Thanks, jaycee! Would there be any benefit to changing the drivers?
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Old 2nd September 2012, 04:50 PM   #4
jaycee is offline jaycee  United Kingdom
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Not really. Besides, they are TO-66, and you aren't going to find anything like that now. You would have to try and fit something in a TO-220 package. If the original drivers are working OK, stick with them.
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Old 2nd September 2012, 04:59 PM   #5
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Quote:
Originally Posted by jaycee View Post
Not really. Besides, they are TO-66, and you aren't going to find anything like that now. You would have to try and fit something in a TO-220 package. If the original drivers are working OK, stick with them.
Killer! Thank you !

Now to fab up that DIP14 to DIP8 adapter...
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