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2sc2291-89C DUDs
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2sc2291-89C DUDs

by textile on Fri Sep 24, 2010 11:11 pm

2SC2291-89C do not work.
Ordered from UTsource , who are quite good with parts. Have gotten 2sc2291-16F from them before.
No measurements but it will give 500 hfe in reverse pin-out as with 1583 (!?) Restamped 2SC1583 (hfe 300) ??
Real pain in the neck. Watch-out!!
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Re: 2sc2291-89C really 2sc1583

by textile on Sun Sep 26, 2010 7:01 am

They work as 2sc1583 :shock: , put them in place and they work as normal 2sc1583 , did sound recordings back to back no difference!!
So its not all bad , just goes to show that re-stamping is quite common.
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Re: 2sc2291-89C DUDs

by Luap on Sun Sep 26, 2010 11:07 am

Are these what Gaetano has mentioned before? The fakes?
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Re: 2sc2291-89C DUDs

by textile on Sun Sep 26, 2010 6:57 pm

I think it was 1583 that were the fakes . These work good they just aren't 2291 :D
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Re: 2sc2291-89C really 2sc1583

by Brassteacher on Wed Oct 13, 2010 1:32 pm

textile wrote:They work as 2sc1583 :shock: , put them in place and they work as normal 2sc1583 , did sound recordings back to back no difference!!
So its not all bad , just goes to show that re-stamping is quite common.


I wonder if these are re-re-stamped 2SC1583 52G that Gaetano was talking about. The reason being after I saw his thread on those the other day, I looked and found two with the 52G marking in my stash. They were the correct pin-out, but the Hfe measured around 350, when the Hfe on a couple of the "vintage" 1583's I have measured in the mid 600's. Swapping those back and forth made a big difference in the sound, especially noticeable when swapping them back and forth as the differential amp/buffer of the filter. The least difference, basically inaudible, was in the VCO.

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"Jack of all trades, master of none, proficient at even fewer..."
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Re: 2sc2291-89C DUDs

by 01012k7 on Sat Apr 27, 2013 3:18 am

I had the same problem so I decided to give ebay another go and did think about maybe to match transistors BC549c that was the idea from the guy who built it for me so did another search and little diode was the company that came up and also some one like 20 miles away so decided to order one from each of them but the little diode was the best gain http://www.littlediode.com/


P.S I started ordering parts 3 months ago and been playing with it about 2 weeks you can get the parts I found just don't give up its worth it in the end ..
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Re: 2sc2291-89C DUDs

by rarara on Sat Apr 27, 2013 3:49 am

what are the symptoms of a box that might have duds fitted?
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Re: 2sc2291-89C DUDs

by pulsar256 on Sat Apr 27, 2013 6:13 am

rarara wrote:what are the symptoms of a box that might have duds fitted?

The filter does not work. I was also one of the lucky ones: viewtopic.php?f=12&t=38575

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Re: 2sc2291-89C DUDs

by 01012k7 on Sat Apr 27, 2013 7:08 am

My x0xb0x works fine just my friend who built it just did all the checks before installing the parts he very thorough
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Re: 2sc2291-89C DUDs

by 01012k7 on Sat Apr 27, 2013 7:11 am

textile wrote:2SC2291-89C do not work.
Ordered from UTsource , who are quite good with parts. Have gotten 2sc2291-16F from them before.
No measurements but it will give 500 hfe in reverse pin-out as with 1583 (!?) Restamped 2SC1583 (hfe 300) ??
Real pain in the neck. Watch-out!!

yes Ut source are a good company they gave me the fake one I sent them message just to let them know I was not upset as I can use it as the 1583 in my yusynth synth I am building ..
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Re: 2sc2291-89C DUDs

by a1k0n on Tue Oct 25, 2016 8:10 pm

I was just bit by this; I have a part labeled as a "C2291 16F" which is actually a common-emitter NPN transistor pair (like a 2SC1583 or 2SC2259), whereas a real 2291 would be a common-base NPN pair.

I guess one way to recognize this might be the fact that the "F" is slightly misshapen. Pic:

Image

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