what is NPN bjt "2961" -in Crown amp - diyAudio
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Old 10th February 2010, 03:13 AM   #1
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Default what is NPN bjt "2961" -in Crown amp

I am working on a Crown Power Tech 2.1 amp. One of NPN transistor is labeled "2961". Any one know specs of it or full name of it?
On Crown Power Tech 3.1 schematic it is used opposit side of 2n4125 as if "2961 " as a complimentary pair to 2n4125. But 2n4123 is complementary to 2n4125 and Crown power tech 3.1 uses 2n4123 on opposit side of 2n4125 then it uses "2961" npn's. Can anybody clear this up??
Thanks in advance.
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Old 10th February 2010, 03:28 AM   #2
Enzo is offline Enzo  United States
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Call Crown and ask.
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Old 10th February 2010, 03:36 AM   #3
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Gee Thanx
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Old 10th February 2010, 03:56 AM   #4
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a 2N2961 is a small TO-39 (metal Can) NPN transistor. It may be used for thermal tracking of the output transistors. I am guessing the "2N" prefix
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Old 10th February 2010, 10:21 AM   #5
Enzo is offline Enzo  United States
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birdyman, Crown is a very customer friendly organization in my humble professional experience. If you call custoimer service there this morning, it is my sincere belief they will in fact answer any question you have.

Crown often labels their transistors with their own part numbers. For example from my parts drawers I see:

Crown C8753-5, which is a 2SA1186.
Crown C8574-3, which is a 2SC2837

There is no formula for translating their numbers to industry numbers. SO without Crown documentation, I have to get the information from Crown.

If you have a master Crown parts list, it generally identifies the generic transistor type in the description line. I would look it up for you, but my copy of that list is in another city on another computer.

Stocktrader could be right, is your mytery part a TO39? If it is a TO92 like the 2N4124, then I think the number is not short for a 2N number.

Certain Crown transistors are selected for characteristics. SO on your TO3 outputs for example you might find "#4" or something stamped onto them. You want to get replacements with the same number or within 1 at least in those cases. Only place to get those would be from Crown.

Crown will send you the service manual for your amp if you ask them. That would include the schematics, the parts layouts, and the parts lists, not to mention any adjustment procedures and specs.

And they might even send you a copy of their master parts listing.


And the only way I know to make any of that happen, is to...

Call Crown and ask.

I regret that you do not find this suggestion of use.
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Old 10th February 2010, 09:16 PM   #6
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Sorry I misunderstood you. Thank you very much for your kind explanation. I will call crown to see what is about.
Just like stocktrader200 said, it was TO-92 pk used for long tail current source.
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Old 16th February 2010, 12:17 AM   #7
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Default Crown 2961

Crown used a totally unique 4 digit part numbering scheme for their transistors which DIDN'T correlate to any "standard" 2N numbers.

They did make a "transistor service replacement chart" which I'm looking at right now. A "selected" Sprague 2N3859A is listed as their recommended replacement for the 2961. Good Luck.

Charles
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Old 22nd February 2010, 05:02 PM   #8
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Default thanks

thank you for info. Crown tech guy did not know and suggested complimentary pair to replace both side.
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Old 22nd February 2010, 05:06 PM   #9
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stellavox: care to share that list??? tetech2@doitnow.com
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Old 22nd February 2010, 06:49 PM   #10
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Quote:
Originally Posted by birdyman View Post
I am working on a Crown Power Tech 2.1 amp. One of NPN transistor is labeled "2961". Any one know specs of it or full name of it?
On Crown Power Tech 3.1 schematic it is used opposit side of 2n4125 as if "2961 " as a complimentary pair to 2n4125. But 2n4123 is complementary to 2n4125 and Crown power tech 3.1 uses 2n4123 on opposit side of 2n4125 then it uses "2961" npn's. Can anybody clear this up??
Thanks in advance.
It's a date code. It was made in the 61st week of 1929.

G
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